I\'m having trouble understanding how to solve the following questions.. 3) Cons

Question

I'm having trouble understanding how to solve the following questions.. 3) Consider a 0.25M solution of the weak acid, HF, at a pH of 2.04. Assume x is small relative to the initial concentration of acid (small x approximation). a) Determine the Ka of HF. If you are unable to solve, you may use 1.0x10-4 for the remaining parts of the question. pH12.oy C 10 wf-> + f [ (2.11 A. b) Calculate the percent ionization of a 0.25 M solution of HF 0.2M c) Calculate the percent ionization of a 0.025 M solution of HR (Hint youll need to recalculate pHrHep d) For both concentrations, is the small x approximation valid? Justfy your answer. e) If the small x approximation is not valid, show how you would set up the solution using an ICE table. DO NOT SOLVE the small approximation s not

Explanation / Answer

c)

% ionization = [H+]/M*100%

[H+] = from ka

KA = [H+][F-]/[HF]

10^-4 =(x*x)/(0.025-x)

x = H+ = 0.00153

then

% ionization = [H+]/M*100% = 0.00153/(0.025)*100 = 6.12 %

d)

no, since Ka is to close to M^2; therefore, expct the acid to be very near to that of M

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