You are given two unlabeled beakers containing solution of an acid and an alkali. Identify the solutions (acid and alkali) by pouring about 2 cm3 of each solution into separate test tubes and adding few drops of phenolphthalein indicator (POP) in both test tubes. Label the identified alkali as A and the acid as C. Given the information that, solution A contained 5.6 g of pure potassium hydroxide in 1 dm3 of solution and solution C had 6.0 g of an impure sulphuric acid in 1 dm3 . Answer the following questions:

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Determine the effect of concentration on the rate of chemical reaction. Study the reaction between sodium thiosulphate and hydrochloric acid. The chemicals provided are labelled as QQ containing 3.16 g/dm3 sodium thiosulphate solution, TT containing 7.3 g/dm3 hydrochloric acid solution, and distilled water. You are also provided with a stop watch and a piece of white paper marked X on which a 100 cm3 beaker containing the reaction mixture. Proceed as follows: (i) Place 100 cm3 beaker on top of the sheet labelled by letter X in such a way that the letter X is visible when viewed from above. (ii) Using measuring cylinder, measure 50 cm3 of solution QQ and pour it

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