Equal volumes of 0.10 M CH3COOH (pK_a = 4.76) and 0.10 M NH3 (pK_b = 4.74) are mixed. Using pH = 7 + tfrac12(pK_a - pK_b

Question

Equal volumes of 0.10 M CH3COOH (pK_a = 4.76) and 0.10 M NH3 (pK_b = 4.74) are mixed. Using pH = 7 + tfrac12(pK_a - pK_b) for the salt of a weak acid and a weak base, select the correct statement(s).

Accepted Answer

The pH of the resulting CH3COONH4 solution is about 7.01

Accepted Answer

If HCN (pK_a = 9.20) replaced acetic acid, the pH of the salt would be about 9.23

Accepted Answer

The pH is independent of the salt concentration

Answer

The solution is clearly acidic (pH below 6) because acetic acid is the stronger acid

Equal volumes of $0.10 M$ $CH X_{3} COOH$ ( $p K_{a} = 4.76$ ) and $0.10 M$ $NH X_{3}$ ( $p K_{b} = 4.74$ ) are mixed. Using $pH = 7 + \frac{1}{2} (p K_{a} - p K_{b})$ for the salt of a weak acid and a weak base, select the correct statement(s).

Answer: B, C, D

More questions on Mixtures of weak acids and bases

Equal volumes of 0.10 M CHX3​COOH (pKa​=4.76) and 0.10 M NHX3​ (pKb​=4.74) are mixed. Using pH=7+21​(pKa​−pKb​) for the salt of a weak acid and a weak base, select the correct statement(s).

Answer: B, C, D

More questions on Mixtures of weak acids and bases

Equal volumes of $0.10 M$ $CH X_{3} COOH$ ( $p K_{a} = 4.76$ ) and $0.10 M$ $NH X_{3}$ ( $p K_{b} = 4.74$ ) are mixed. Using $pH = 7 + \frac{1}{2} (p K_{a} - p K_{b})$ for the salt of a weak acid and a weak base, select the correct statement(s).