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A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was terted with universal indicator paper, its pH was found to be 9. (a) What does pH 9 tell us about the sodium salt solution. (b) Name one sodium salt which can produce such a solution.

(i) Explain why is hydrochloric acid a strong acid and acetic acid, a weak acid ? How can it be verfied ? (ii) Explain why equeous solution of an acid conducts electricity. (iii) You have four solutions A, B,C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (a) Identify rhe most acidic and most basic solutions. (b) Arrange the above four solutions in the increasing order of H^(+) ion concentration. (c ) State the change in colour of pH paper on dipping in solution C and d.

You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (a) Identify the most acidic and most basic solutions. (b) Arrange the above four solutions in the increasing order of H^+ ion concentration. (c) State the change in colour of pH paper on dipping in solution C and D.