5. Calculate the concentration of hydrogen ions and pH of the following aqueous solutions: a) a solution obtained by dissolving 1.12 g of KOH in 200 cm3 of water; b) 0.1 n. an aqueous solution of ammonia; c) a solution obtained by dissolving 3.20 g of NH4NO3 in 100 cm3 of 0.1 N. aqueous solution of ammonia.

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