Titrations How can use titrations to work out

Titrations How can use titrations to work out the concentration of a chemical Starter: HCl + Na. OH Na. Cl +H 2 O H+ + OH - H 2 O 1) What do these reactions show? 2) What conditions are necessary for this to occur?

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

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

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.

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

The Method • V: ScienceTeaching resource storeFreezeray Chem Simulationstitrations[1]. swfhttp: //www. mhh e. com/physsci/chemistry/animations/chang_7 e_esp/crm 3 s 5_5. swf

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

Reactions that aren’t a 1: 1 ratio