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science </a></li><li><a href="../19519/metals-and-icp-spectroscopy-1.html">Metals and ICP spectroscopy</a></li><li><a href="../19541/catalysts--1.html">Catalysts </a></li><li><a href="../19580/liquid-crystals-1.html">Liquid crystals</a></li><li><a href="../19665/polymers--1.html">Polymers </a></li><li><a href="../19672/nanotechnology-1.html">Nanotechnology</a></li><li><a href="../19843/environmental-impact-plastics-1.html">Environmental impact - plastics</a></li><li><a href="../19858/superconducting-metals-x-ray-crystallography--1.html">Superconducting metals & X-ray crystallography </a></li><li><a href="../19666/condensation-polymers-1.html">Condensation polymers</a></li><li><a href="../19916/environmental-impact-heavy-metals-1.html">Environmental impact - heavy metals</a></li></ul></li><li><a href="../19284/option-b--1.html" class="father">Option B </a><ul class="level-2"><li><a href="../19290/introduction-to-biochemistry--1.html">Introduction to biochemistry </a></li><li><a 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nuclear fission reactions</a></li><li><a href="../19429/solar-energy-1.html">Solar energy</a></li><li><a href="../19437/environmental-impact-global-warming-1.html">Environmental impact - global warming</a></li><li><a href="../19453/electrochemistry-rechargeable-batteries-fuel-cells-1.html">Electrochemistry, rechargeable batteries & fuel cells</a></li><li><a href="../19458/nuclear-fusion-fission-hl--1.html">Nuclear fusion & fission (HL) </a></li><li><a href="../19470/photovoltaic-cells-and-dsscs-1.html">Photovoltaic cells and DSSCs</a></li></ul></li><li><a href="../19078/option-d-1.html" class="father">Option D</a><ul class="level-2"><li><a href="../19079/pharmaceutical-products-drug-action--1.html">Pharmaceutical products & drug action </a></li><li><a href="../19158/aspirin-penicillin--1.html">Aspirin & penicillin </a></li><li><a href="../19174/opiates-1.html">Opiates</a></li><li><a href="../19184/ph-regulation-of-the-stomach-1.html">pH regulation of the stomach</a></li><li><a href="../19194/antiviral-medications--1.html">Antiviral medications </a></li><li><a href="../19211/environmental-impact-of-some-medications-1.html">Environmental impact of some medications</a></li><li><a href="../19254/taxol-a-chiral-auxiliary-case-study-1.html">Taxol - a chiral auxiliary case study</a></li><li><a href="../19258/nuclear-medicine--1.html">Nuclear medicine </a></li><li><a href="../19273/drug-detection-analysis--1.html">Drug detection & analysis </a></li></ul></li></ul></li><li><a href="../16592/practical-scheme-of-work-ia--1.html">Practical scheme of work & IA </a><ul class="level-1"><li><a href="../16682/internal-assessment-1.html" class="father">Internal Assessment</a><ul class="level-2"><li><a href="../18892/scaffolding-the-investigation-1.html">'Scaffolding' the investigation</a></li><li><a href="../18896/timing-organisation--1.html">Timing & organisation </a></li><li><a href="../18905/choosing-the-research-question-1.html">Choosing the research question</a></li><li><a href="../18946/personal-engagement-1.html">Personal engagement</a></li><li><a href="../18950/exploration-1.html">Exploration</a></li><li><a href="../18957/analysis-1.html">Analysis</a></li><li><a href="../18965/evaluation-1.html">Evaluation</a></li><li><a href="../18966/communication-1.html">Communication</a></li><li><a href="../19882/internal-standardization-of-the-ia-1.html">Internal standardization of the IA</a></li><li><a href="../19901/submitting-the-samples-for-moderation-2.html">Submitting the samples for moderation</a></li><li><a href="../33754/ten-suggestions-for-ias-using-secondary-data-1.html">Ten suggestions for IAs using secondary data</a></li><li><a href="../37544/gaining-full-marks-for-a-databased-ia--1.html">Gaining full marks for a databased IA </a></li><li><a href="../19506/ia-example-marking-exercise--1.html">IA example & marking exercise </a></li><li><a href="../23929/genuine-examples-of-moderated-ia-reports-1.html">Genuine examples of moderated IA reports</a></li><li><a href="../25234/examples-of-teacher-marked-ia-reports--1.html">Examples of teacher-marked IA reports </a></li><li><a href="../37542/history-of-internal-assessment-1.html">History of Internal Assessment</a></li></ul></li><li><a href="../16598/mandatory-laboratory-components-1.html" class="father">Mandatory laboratory components</a><ul class="level-2"><li><a href="../16613/formula-of-magnesium-oxide--1.html">Formula of magnesium oxide </a></li><li><a href="../16612/determining-the-mr-of-an-unknown-gas-1.html">Determining the <i>M</i><sub>r</sub> of an unknown gas</a></li><li><a href="../16615/acid-base-titrations--1.html">Acid-base titrations </a></li><li><a href="../16616/a-green-acid-base-practical-1.html">A green acid-base practical</a></li><li><a href="../16617/analysis-of-aspirin-tablets-1.html">Analysis of aspirin tablets</a></li><li><a href="../16618/caco3-in-egg-shells-1.html">CaCO<sub>3</sub> in egg shells</a></li><li><a href="../16644/enthalpy-changes-1.html">Enthalpy changes</a></li><li><a href="../16631/reaction-rates-1.html">Reaction rates</a></li><li><a href="../16635/rate-dependent-factors-1.html">Rate-dependent factors</a></li><li><a href="../16636/determining-ea-for-a-reaction-1.html">Determining <i>E</i><sub>a</sub> for a reaction</a></li><li><a href="../16637/iodination-of-propanone-1.html">Iodination of propanone</a></li><li><a href="../18144/titrations-with-a-ph-meter-1.html">Titrations with a pH meter</a></li><li><a href="../18355/redox-titration-with-kmno4--1.html">Redox titration with KMnO<sub>4</sub> </a></li><li><a href="../16640/voltaic-cells-1.html">Voltaic cells</a></li><li><a href="../16659/3-d-molecular-modelling--1.html">3-D molecular modelling </a></li></ul></li><li><a href="../17168/other-good-practicals-1.html" class="father">Other good practicals</a><ul class="level-2"><li><a href="../17196/common-chemical-reactions-1.html">Common chemical reactions</a></li><li><a href="../227/elements-oxides-of-the-third-period--1.html">Elements & oxides of the third period </a></li><li><a href="../17239/the-halogens-1.html">The halogens</a></li><li><a href="../17162/boiling-points-of-mixtures-1.html">Boiling points of mixtures</a></li><li><a href="../17170/polarity-of-molecules-1.html">Polarity of molecules</a></li><li><a href="../18083/le-chateliers-principle--1.html">Le Chatelier's principle </a></li><li><a href="../19582/determining-kc-for-an-esterification-reaction-1.html">Determining <i>K</i><sub>c</sub> for an esterification reaction</a></li><li><a href="../18164/redox-reactions-of-vanadium--1.html">Redox reactions of vanadium </a></li><li><a href="../18351/chlorine-in-swimming-pools--1.html">Chlorine in swimming pools </a></li><li><a href="../18178/analysis-of-cuii-ions-in-solution--1.html">Analysis of Cu(II) ions in solution </a></li><li><a href="../18179/percentage-of-copper-in-brass-1.html">Percentage of copper in brass</a></li><li><a href="../18356/electrolytic-cells--1.html">Electrolytic cells </a></li><li><a href="../18598/reactions-of-organic-compounds-1.html">Reactions of organic compounds</a></li><li><a href="../18752/hydrolysis-of-halogenoalkanes-1.html">Hydrolysis of halogenoalkanes</a></li><li><a href="../18784/preparation-of-13-dinitrobenzene--1.html">Preparation of 1,3-dinitrobenzene </a></li><li><a href="../19022/determination-of-an-organic-structure-1.html">Determination of an organic structure</a></li><li><a href="../19887/preparation-of-nylon-66-1.html">Preparation of nylon 6,6</a></li><li><a href="../19343/determination-of-vitamin-c-content--1.html">Determination of vitamin C content </a></li><li><a href="../19342/hydrolysis-of-starch--1.html">Hydrolysis of starch </a></li><li><a href="../19159/preparation-purification-of-aspirin--1.html">Preparation & purification of aspirin </a></li></ul></li><li><a href="../18851/ict-in-practical-work-1.html" class="father">ICT in practical work</a><ul class="level-2"><li><a href="../18852/data-logging--1.html">Data logging </a></li><li><a href="../18853/software-for-graph-plotting--1.html">Software for graph plotting </a></li><li><a href="../18854/spreadsheets-for-data-processing--1.html">Spreadsheets for data processing </a></li><li><a href="../18855/databases-1.html">Databases</a></li><li><a href="../18856/computer-modelling-simulations--1.html">Computer modelling & simulations </a></li></ul></li><li><a href="../16594/group-4-project-1.html" class="father">Group 4 Project</a><ul class="level-2"><li><a href="../16595/practicalities-1.html">Practicalities</a></li><li><a href="../16596/reflective-statement--2.html">Reflective statement </a></li></ul></li><li><a href="../16666/a-new-laboratory-1.html">A new laboratory?</a></li></ul></li><li><a href="../16284/exams-1.html">Exams</a><ul class="level-1"><li><a href="../16286/essential-facts-1.html" class="father">Essential Facts</a><ul class="level-2"><li><a 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href="../3507/why-tok-chemistry-1.html">Why TOK & Chemistry?</a></li><li><a href="../3505/a-modern-paradigm-1.html">A modern paradigm</a></li></ul></li></ul></li><li><a href="../17783/fast-track-to-tests-questions-1.html">Fast track to tests & questions</a><ul class="level-1"><li><a href="../17784/sl-multiple-choice-tests-on-individual-topics-1.html">SL Multiple choice tests on individual topics</a></li><li><a href="../24351/sl-multiple-choice-quizzes-on-sub-topics-1.html">SL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31519/sl-practice-paper-1-exams-1.html">SL Practice Paper 1 exams</a></li><li><a href="../17786/sl-questions-on-each-sub-topic-1.html">SL Questions on each sub-topic</a></li><li><a href="../20431/sl-paper-3-section-a-questions-1.html">SL Paper 3 Section A questions</a></li><li><a href="../17792/sl-questions-on-the-options-1.html">SL Questions on the options</a></li><li><a href="../24897/sl-quizzes-on-option-sub-topics--1.html">SL Quizzes on option sub-topics </a></li><li><a href="../17785/hl-multiple-choice-tests-on-individual-topics-1.html">HL Multiple choice tests on individual topics</a></li><li><a href="../24352/hl-multiple-choice-quizzes-on-sub-topics-1.html">HL Multiple choice 'quizzes' on sub-topics</a></li><li><a href="../31520/hl-practice-paper-1-exams--1.html">HL Practice Paper 1 exams </a></li><li><a href="../17787/hl-questions-on-each-sub-topic--1.html">HL Questions on each sub-topic </a></li><li><a href="../20428/hl-paper-3-section-a-questions-1.html">HL Paper 3 Section A questions</a></li><li><a href="../17793/hl-questions-on-the-options-1.html">HL Questions on the options</a></li><li><a href="../24973/hl-quizzes-on-option-sub-topics-1.html">HL Quizzes on option sub-topics</a></li><li><a href="../41573/printable-versions-of-written-tasks--1.html">Printable versions of written tasks </a></li></ul></li><li><a href="../41465/complete-course-for-students--2.html">Complete course for students </a><ul 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</div><section id="main-content"><div class="blueBg"><h1>A systematic way of naming chemical substances</h1><p>As new substances were discovered or synthesized in the past their names may have been related to the natural substance or place they were derived from. For example, oil of wintergreen and Epsom salts Or they may have been named according to the use they were put to (e.g. washing soda crystals), or the person who first discovered the substance (e.g. Vaska’s compound<sup>1</sup>) or a variety of other reasons. As more and more compounds were discovered or synthesized it became more and more difficult to remember all their names as there was no systematic logic behind them.</p><p><a href="http://www.iupac.org/"><img alt="" class="right noborder" height="235" src="../../../ib/chemistry/images/TOK images/IUPAC.jpg" title="The logo of IUPAC taken from the IUPAC website" width="265"></a>In 1919 the <a href="http://www.iupac.org/">International Union of Pure and Applied Chemists</a> (IUPAC) was formed. IUPAC is an international, non-governmental body made up of chemists from both academia and industry. The aim of IUPAC is to fostering worldwide communication in chemistry. Currently about one thousand chemists throughout the world are engaged on a voluntary basis working for IUPAC. One of their greatest achievements has been to bring in a logical and accepted way of naming compounds. IUPAC of course is a great example, perhaps the best example, of the International Dimension in Chemistry. The use of IUPAC nomenclature, formerly known as the Stock-naming system for inorganic compounds, makes much use of oxidation numbers. An oxidation number is the same as an oxidation state except that the sign is omitted and the number is written in Roman numerals. Since this is the TOK section it is worth noting that oxidation numbers do not actually exist. Atoms or ions do not go around with their oxidation number stamped on them! Oxidation states are a man-made concept and in fact wrong assumptions, such as covalent compounds being assumed to be ionic, are made in order to assign oxidation states.</p><p>Thus in the past what was known as cupric sulfate, CuSO<sub>4</sub> now becomes copper(II) sulfate and is easily distinguishable from copper(I) sulfate, Cu<sub>2</sub>SO<sub>4</sub>, which used to be known as cuprous sulfate. In theory all inorganic compounds should include the oxidation number but for elements that only have one common oxidation number it is omitted, e.g. potassium nitrate is not called potassium(I) nitrate. Many simple compounds also still retain their old name so that, for example, ammonia is still known as ammonia not nitrogen(III) hydride and water is not hydrogen(I) oxide. Although IB Diploma Chemistry, along with other examination boards, tends to have adopted the IUPAC way of naming substances there are still many exceptions and in the wider world non-chemists (and some chemists!) still often use common names so there is still some confusion over naming.</p><hr class="hidden"><p style="text-align: center;"><strong>Some examples of different chemical names still in use</strong></p><table align="center" border="1" cellpadding="10" cellspacing="2"><tbody><tr><td style="text-align: center;"><strong>IUPAC name</strong></td><td style="text-align: center;"><strong>Common name</strong></td><td style="text-align: center;"><strong>Formula</strong></td></tr><tr><td style="text-align: center;">sulfate(VI)</td><td style="text-align: center;">sulfate (or sulphate)</td><td style="text-align: center;">SO<sub>4</sub><sup>2</sup><sup>−</sup></td></tr><tr><td style="text-align: center;">sulfate(IV)</td><td style="text-align: center;">sulfite (or sulphite)</td><td style="text-align: center;">SO<sub>3</sub><sup>2</sup><sup>−</sup></td></tr><tr><td style="text-align: center;">nitrate(V)</td><td style="text-align: center;">nitrate</td><td style="text-align: center;">NO<sub>3</sub><sup>−</sup></td></tr><tr><td style="text-align: center;">nitrate(III)</td><td style="text-align: center;">nitrite</td><td style="text-align: center;">NO<sub>2</sub><sup>−</sup></td></tr><tr><td style="text-align: center;">iron(II) chloride</td><td style="text-align: center;">ferrous chloride</td><td style="text-align: center;">FeCl<sub>2</sub></td></tr><tr><td style="text-align: center;">iron(III) chloride</td><td style="text-align: center;">ferric chloride</td><td style="text-align: center;">FeCl<sub>3</sub></td></tr><tr><td style="text-align: center;">sodium hydrogencarbonate</td><td style="text-align: center;">bicarbonate of soda</td><td style="text-align: center;">NaHCO<sub>3</sub></td></tr><tr><td style="text-align: center;">ethanoic acid</td><td style="text-align: center;">acetic acid</td><td style="text-align: center;">CH<sub>3</sub>COOH</td></tr><tr><td style="text-align: center;">methanal</td><td style="text-align: center;">formaldehyde</td><td style="text-align: center;">HCHO</td></tr></tbody></table><hr class="hidden"><p>It is tempting to compare how <span data-scayt-word="IUPAC" data-wsc-lang="en_US">IUPAC</span> works to some governmental agencies such as the <em><span data-scayt-word="Académie" data-wsc-lang="en_US">Académie</span> <span data-scayt-word="française" data-wsc-lang="en_US">française</span></em> (French Academy). The <em><span data-scayt-word="Académie" data-wsc-lang="en_US">Académie</span> <span data-scayt-word="française" data-wsc-lang="en_US">française</span> was</em> founded in 1635 by Cardinal Richelieu and revived by Napoleon Bonaparte in 1803 after it was suppressed during the French revolution. Its function is to decide how the French language should be used. Chemists generally accept <span data-scayt-word="IUPAC" data-wsc-lang="en_US">IUPAC</span> but the mass of the people tend to ignore this and still tend to impose their own way of using words. Shops worldwide still stock ‘white spirit’, ‘vinegar’, ‘washing soda crystals’ and ‘baking powder’. Meanwhile in France, in a similar way, many people ignore the <span data-scayt-word="dictat" data-wsc-lang="en_US">dictat</span> of the <em><span data-scayt-word="Académie" data-wsc-lang="en_US">Académie</span> <span data-scayt-word="française" data-wsc-lang="en_US">française</span> </em>and use ‘<em>le weekend</em>’ and ‘<em>le football</em>’.</p><hr class="hidden"><h4>Footnote</h4><p><sup>1</sup> <em>trans</em>-chlorocarbonylbis(<span data-scayt-word="triphenylphosphine" data-wsc-lang="en_US">triphenylphosphine</span>)iridium(I), <span data-scayt-word="IrCl" data-wsc-lang="en_US">IrCl</span>(CO)(PPh<sub>3</sub>)<sub>2</sub></p></div></section></article><section id="media-extras"><div class="page-actions no-print navbar inline hidden-desktop"><div class="navbar-inner"><ul class="nav"><li><a class="presentation" href="#" onclick="return false;"><i class="fa fa-desktop"></i></a></li><li><a class="print-section-blog" href="#" onclick="return false;"><i class="fa fa-print"></i></a></li><li><a class="page-bookmarker" data-ticket="IB Docs (2) Team" data-pid="3511" href="#" onclick="return false;"><i class="fa fa-star"></i></a></li><li><a class="personal-notes" href="#" onclick="return false;"><i class="fa fa-file-text"></i></a></li><li><a class="" data-toggle="modal" href="#modal-feedback" onclick="return false;"><i class="fa fa-envelope-o"></i></a></li><li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" data-target="#" href="#"><i class="fa fa-share-alt"></i></a><ul class="dropdown-menu" role="menu"><li><a class="" target="_blank" title="Share on Twitter" href="https://twitter.com/share?text=%22IUPAC%22+-+via+%40InThinker+%23chemistry%0A&url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F3511%2Fiupac"><i class="fa fa-twitter-square"></i><span>Twitter</span></a></li><li><a class="" target="_blank" title="Share on Facebook" href="https://www.facebook.com/sharer.php?u=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F3511%2Fiupac&t=IUPAC"><i class="fa fa-facebook-square"></i><span>Facebook</span></a></li><li><a class="" href="http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F3511%2Fiupac"><i class="fa fa-linkedin-square"></i><span>LinkedIn</span></a></li><li><a class="" href="https://plus.google.com/share?url=https%3A%2F%2Fwww.thinkib.net%2Fchemistry%2Fpage%2F3511%2Fiupac"><i class="fa fa-google-plus-square"></i><span>Google +</span></a></li><li><a class="" href="mailto:?subject=IUPAC&body=As new substances were discovered or synthesized in the past their names may have been related to the natural substance or place they were derived from. 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