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Calculate the pH of the following solutions : a) HF 0.01 M. b) NH4Cl 0.01 M. c) 0.01 M ammonium acetate.

Calculate the pH of the following solutions :
a) HF 0.01 M.
b) NH4Cl 0.01 M.
c) 0.01 M ammonium acetate.

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