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Titrations

Titrations. Starter: HCl + NaOH  NaCl +H 2 O H + + OH -  H 2 O What do these reactions show? What conditions are necessary for this to occur?. How can use titrations to work out the concentration of a chemical. Glossary.

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Titrations

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  1. Titrations Starter: HCl + NaOH NaCl +H2O H+ + OH -  H2O What do these reactions show? What conditions are necessary for this to occur? How can use titrations to work out the concentration of a chemical

  2. Glossary • Titration – a method for measuring the volumes of two solutions that react together. • Alkali – A soluble base with a pH less than 7.

  3. Titrations -strong acid + strong alkali • = neutralise & form a salt -But ONLY if they are in exactly the right quantities. • Otherwise, one (acid or alkali) will be in excess Quick Check: -If there is more acid than alkali to start with in a neutralisation reaction, what will happen? • The final solution will be acidic

  4. Titration • A way to measure volumes precisely • End Point • The point at which the acid and alkali have reacted completely. • This is shown using an indicator.

  5. Concentration = no. of moles volume • Learn this formula triangle! number of moles n concentration (in moldm-3) volume (in dm3) c v

  6. The Method • V:\Science\Teaching resource store\FreezerayChem Simulations\titrations[1].swfhttp://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/crm3s5_5.swf

  7. Calculations Follow the example. Read the instructions and use them to answer the first half of the worksheet.

  8. Reactions that aren’t a 1:1 ratio

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