the equivalence point? A. 8.69 times 10^-3 mL B. 33.4 mL C. 36.7 mL D. 115 mL 10
ID: 963424 • Letter: T
Question
the equivalence point? A. 8.69 times 10^-3 mL B. 33.4 mL C. 36.7 mL D. 115 mL 10. Calculate the pH of a buffer that is 0.20 M in formic acid and 0.15 M in sodium formal (K_a = 1.8 times 10^-4). A. 2.4 times 10^-4 B. 3.63 C. 0.82 D. 8.33 11 Which of the following acid dissociation constants represonta a stronger acid? A. K_a = 1.8times10^-5 B. K_a 7.4times10^-4 C. K_a = 1.45times10^-6 D. K_a = 6.67times10^-10 12. If X is the solubility of a salt in moles per liter, which one of the following K_sp expressions is incorrect? A. Ag_2S, K_sp = 4X^3 B. AgCl, K_sp = X^2 C. BaSO_4, Ksp = 4 X^2 D. Cu(OH)_2, Ksp = 4X^3Explanation / Answer
10.
pH = pKa +log(Formate/Formic acid)
pH = 3.75 + log(0.15/0.2) = 3.625061
11.
the stronger acid is the one with the highes Ka value, i.e. 7.4*10^-4
12.
BaSO4, since Ba+2 and SO4-2
Ksp = (x)(x)
Ksp = x^2
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