Calculate the pH of an acetic acid/acetate buffer in which the concentration of

Question

Calculate the pH of an acetic acid/acetate buffer in which the concentration of acetic acid is always 0.34 M, but the concentration of sodium acetate (NaCH_3 COO) corresponds to the following value: 0.32 M. (K_a for CH_3 COOH is 1.8 times 10^-5.) Report your answer to three significant figures. Calculate the pH of a bicarbonate/carbonate buffer in which the concentration of sodium bicarbonate (NaHCO_3) is always 0.33 M, but the concentration of sodium carbonate (Na_2 CO_3) corresponds the following value: 0.31 M. (K_a for HCO_3^- is 5.6 times 10^-11.) Report your answer to three significant figures. The optimum pH of a swimming pool is 7.58. Calculate the value of [H_3 O^+] and [OH^-] at this pH. [H_3 O^+] = times 10 (select) M [OH^-] = times 10 (select) M What is the pH of a buffer that contains 0.31 M CH_3 COOH and 0.42 M NaCH_3 COO? (K_a = 1.8 times 10^-5). Report your answer to three significant figures. Using the K_a values in the table below, calculate the pH of a buffer that contains the given concentrations of a weak acid and its conjugate base. 0.36 M NaHCO_3 and 0.30 M Na_2 CO_3 pH = Calculate the pH of an acetic acid/acetate buffer in which the concentration of acetic acid is always 0.34 M, but the concentration of sodium acetate (NaCH_3 COO) corresponds to the following value: 0.32 M. (A_a for CH_3 COOH is 1.8 times 10^-5.) Report your answer to three significant figures.

Explanation / Answer

Q48

this is a buffer, so apply buffer equation

pH = pKa + log(NaA/HA)

pKa = -log(Ka) = -log(1.8*10^-5) = 4.755

pH = 4.75 log(0.32 / 0.34 )

pH = 4.7183

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