For each of the following salt solutions, indicate whether the solution will be

Question

For each of the following salt solutions, indicate whether the solution will be acidic, basic or neutral. Then using data given below, calculate [OH-] or [H3O+] and pH for each solution. (a) 0.09 M NaF (Ka (HF) = 5.0 x 10^-04) [OH-] = pH = (b) 0.70 M NH4Cl(Kb (NH3) = 2.0 x 10^-05) [H3O+] = pH =

Explanation / Answer

(a) [H+] = C * square root Ka = 0.09 * square root 5.0 x 10^-04 = 0.002 M ---> [OH-] = Kw /[H+] = 10^-14 / 0.002 = 5 * 10^-12 ---- > pH= -log [H+] = -log 0.002 = 2.70. ---- (b) NH4Cl breaks into NH4+ and Cl-. NH4+ on reaction with water forms NH3 and H3O+ or H+. ----> [H+] = C * square root Ka =0.70 * square root 2.0 x 10^-05 = 0.0031 ---- > pH= -log [H+] = -log 0.0031 = 2.51

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