3. (a) Asubuhi Njema’s child was sick. When she took her to the hospital, she was prescribed some medicine including a bottle of syrup. The bottle was written, Shake before you use. What does this statement signify? (3 marks)
12. Read the following information carefully then answer questions that follow: 25 cm3 of potassium hydroxide were placed in a flask and a few drops of phenolphthalein indicator were added. Dilute hydrochloric acid was added until the indicator changed colour. It was found that 21 cm3 of acid were used.
(b) (i) What piece of apparatus should be used to measure out accurately 25 cm3 of sodium hydroxide solution?
(ii) What colour was the solution in the flask at the start of the titration?
(iii) What colour did it turn when the alkali had been neutralized? (3 marks)
(c) (i) Was the acid more concentrated or less concentrated than the alkali? Give reasons for your answer.
(ii) Name the salt formed in the neutralization.
(iii) Write an equation for the reaction. (4 marks)
(d) Utilizing the given information describe how you can obtain pure crystals of the salt. (3 marks)