26. Calculate the percent ionization of formic acid (HCO2H) in a solution that i

Question

26. Calculate the percent ionization of formic acid (HCO2H) in a solution that is 0.322 M in formic acid and 0.178 M in sodium formate (NaHCO2). The K, of formic acid is 1.77x104 (A) 1.03x10 (B) 10.8 (C) 3.488 (D) 35.6 (E) 0.1011 buffer range for a benzoic acid/sodium benzoate buffer? The K of benzoic acid is 6.3x10 (A) 3.2-5.2 (B) 5.3-7.3 (C) 4.7-6.7 (D) 8.8-10.8 (E) 7.4-9.4 28.The titration curve for 10.0 mL of 0.100 M H,PO (ag) with 0.100 M NaOH(aq) is given below 12 10 pH 4 0 246 8 101214 16 18 20 2224 vb Estimate the pKaz for HsPO (A) (B) (C) (D) (E) 9.8 4.8 7.2 2.2 More information is needed to determine pKa.

Explanation / Answer

26)

HCOOH       <—>   HCOO-       +   H+

C           0           0 (initial)

C-x           x           x (equilibrium)

given:

[HCOO-] = x =0.178 M

[HCOOH] = C-x =0.322 M

C-x =0.322 M

C - 0.178 = 0.322

C = 0.50 M

% ionisation = x*100/C

= 0.178*100/0.5

= 35.6 %

Answer: D

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