9. Calculate the concentration of hydrogen ions and pH of aqueous solutions: a) a solution obtained by diluting 100 cm3 of 4% HCl solution with water to 1 dm3; b) a solution, 750 cm3 of which contains 4.5 g of acetic acid; c) a buffer solution obtained by mixing 30 ml of 0.1 N. acetic acid solution and 20 ml of 0.2 N. sodium acetate solution.
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