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1. At 25 °C, a solution has a hydronium ion concentration of 2.70×10^-6 M. What is the pH, pOH, and [OH-] of this solution? 2. What is the pH of a 7.91×10^-3 M solution of the strong acid HBr? HBr(aq) + H2O(l) → Br-(aq) + H3O+(aq) [HBr]0 = 7.91×10^-3 3. What is the pH of a 2.3×10^-2 M solution of KOH at 25 °C? 4. Calculate the molar H3O+ ion concentration of a solution if the OH- ion concentration is (a) 1.7×10^-4 M___ M (b) 1.0×10^-7 M M (c) 1.0×10^-12 M M (d) 1.0×10^-10 M_M 5. Calculate the pH of the following solutions. (a) [H3O+] = 1.0×10^-5 M pH = (b) [H3O+] = 0.10 M pH = (c) [OH-] = 1.0×10^-2 M pH = (d) [OH-] = 1.0×10^-10 M pH = 6. What is the molar hydronium ion concentration in solutions with each of the following pH values? (a) 2.0 [H3O+] = _M (b) 6.0 [H3O+] = M (c) 11.0 [H3O+] = M (d) 14.0 [H3O+] = _M 7. An organic acid has pKa = 4.70. What is its Ka value? 8. Predict whether each of the following pairs of substances could function as a buffer system in an aqueous solution. (a) HNO3 and Mg(NO3)2 NO Yes (b) HCN and NaCN NO Yes (c) KBr and KCl NO Yes (d) H2SO3 and NaHSO3 NO Yes

          1. At 25 °C, a solution has a hydronium ion concentration of 2.70×10^-6 M. What is the pH, pOH, and [OH-] of this solution?
2. What is the pH of a 7.91×10^-3 M solution of the strong acid HBr? HBr(aq) + H2O(l) → Br-(aq) + H3O+(aq) [HBr]0 = 7.91×10^-3
3. What is the pH of a 2.3×10^-2 M solution of KOH at 25 °C?
4. Calculate the molar H3O+ ion concentration of a solution if the OH- ion concentration is (a) 1.7×10^-4 M_____ M (b) 1.0×10^-7 M____ M (c) 1.0×10^-12 M____ M (d) 1.0×10^-10 M___M
5. Calculate the pH of the following solutions. (a) [H3O+] = 1.0×10^-5 M pH = (b) [H3O+] = 0.10 M pH = (c) [OH-] = 1.0×10^-2 M pH = (d) [OH-] = 1.0×10^-10 M pH =
6. What is the molar hydronium ion concentration in solutions with each of the following pH values? (a) 2.0 [H3O+] = ___M (b) 6.0 [H3O+] = ____ M (c) 11.0 [H3O+] = ____ M (d) 14.0 [H3O+] = ___M
7. An organic acid has pKa = 4.70. What is its Ka value?
8. Predict whether each of the following pairs of substances could function as a buffer system in an aqueous solution. (a) HNO3 and Mg(NO3)2 NO Yes (b) HCN and NaCN NO Yes (c) KBr and KCl NO Yes (d) H2SO3 and NaHSO3 NO Yes

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