Which of the following is a weak polyprotic acid? A. H_2SO_4 B. H_2SO_3 C. NaHSO

Question

Which of the following is a weak polyprotic acid? A. H_2SO_4 B. H_2SO_3 C. NaHSO_4 D. H_2Cr_2O_7 E. HClO_4 Determine the pH of the following solution. Initial concentrations are [NH_3] = 1.20 M and [KOH] = 0.320 M K_b (NH_3) = 1.8 times 10^-5 A) 13.5 B) 8.7 C) 9.8 D) 11.7 E) 12.2 How will addition of sodium chloride affect the pH of a HCl solution? A) It will lower the pH. B) The pH will not change. C) The solution becomes hotter. D) The pH cannot be measured. E) It will raise the pH. For the following compound, predict whether the solution is acidic, basic or neutral and why: NaC_2H_3O_2. A) acidic because HC_2H_3O_2 is a strong acid B) basic because HC_2H_3O_2 is a weak base C) neutral because there is no hydrolysis D) basic because NaC_2H_3O_2 is the salt of a weak acid E) acidic because NaC_2H_3O_2 is the sad of a weak base For the following compound, predict whether the solution is acidic, basic or neutral and why: NH_4ClO_4. A) acidic because HClO_4 is a strong acid B) basic because NH_4^+ is a weak base C) neutral because there is no hydrolysis D) basic because NH_4ClO_4 is the salt of a weak acid & a strong base E) acidic because NH_4ClO_4 is the salt of a weak base & a strong acid A certain acid, HA, has a K_a given by: HA + H_2O H_3O^+ + A^- K_a = 6.80 times 10^-6 What is the pH of a 0.247 M solution of the acid's potassium salt, KA, which undergoes the hydrolysis reaction? A^- + H_2O OH^- + HA A) 4.72 B) 9.28 C) 4.11 D) 9.89 E) 9.44

Explanation / Answer

1. (E) HClO4

2. (E) 12.22

3. (B) the pH will not change

4. (D) basic because NaC2H3O2 is the salt of a weak acid.

5. (E) acidic because NH4ClO4 is the salt of a weak base & a strong acid

6. (C) 4.11

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