Calculate the concentration of hydrogen ions and pH of aqueous solutions:
a) a solution obtained by diluting 10 cm3 of a 5% sulfuric acid solution with water to 100 cm3; b) a solution of formic acid 0.23% concentration (density 1); c) a solution obtained by mixing 70 cm3 of 0.2N. NH4OH solution with 30 cm3 0.4 N. HCl solution.

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