Find the concentration of hydrogen ions and the pH value in the following solutions: a) 0.1 n. hydrochloric acid solution; b) 0.2 n. aqueous ammonia solution; c) a solution of caustic potash containing 0.56 g of caustic potash in 1 dm3 of solution; d) 0.01 n. ammonium chloride solution. Calculate pH 0.01 N. sodium carbonate solution.

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