HW6_Solutions

# 008 100 points which of the following is a strong

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008 10.0 points Which of the following is a strong acid? 1. NaCl 2. HCl correct 3. CH 3 COOH 4. HF Explanation: CH 3 COOH and HF are weak acids. NaCl is a salt. HCl is the only strong acid listed. 009 10.0 points HF is a stronger acid than NH + 4 . Which base would be stronger: F or NH 3 ? 1. Both bases would be equal in strength. 2. Neither F 1 nor NH 3 would be bases. 3. F 4. Cannot tell from the information given. 5. NH 3 correct Explanation: 010 10.0 points What is the molarity of OH in solu- tions with an H 3 O + concentration of 0 . 00289 mol/L? Correct answer: 3 . 46021 × 10 12 mol / L. Explanation: K w = 1 × 10 14 H 3 O + = 0 . 00289 K w = [H 3 O + ] [OH ] [OH ] = K w [H 3 O + ] = 1 × 10 14 0 . 00289 = 3 . 46021 × 10 12 mol / L . 011 10.0 points

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estrada (gse77) – Homework 6 – Sutcliffe – (52410) 3 Choose the pair of concentrations that cannot be in a given aqueous solution at 25 C. 1. Any of these could exist. correct 2. [H 3 O + ] = 10 7 M : [OH ] = 10 7 M 3. [H 3 O + ] = 10 M : [OH ] = 10 15 M 4. [H 3 O + ] = 10 3 M : [OH ] = 10 11 M 5. [H 3 O + ] = 10 14 M : [OH ] = 1 M Explanation: All of these concentrations are possible. Re- call that pH can exist beyond the 1-14 range, but at 25 C, pH + pOH = 14 always applies. 012 10.0 points Which solution is acidic? 1. M OH - = 0 . 0065 M 2. M H + = 1 . 27 × 10 9 M 3. M OH - = 1 . 77 × 10 10 M correct 4. M H + = 5 . 79 × 10 10 M Explanation: An acidic solution has an M H + greater than 1 × 10 7 M, and a M OH - less than 1 × 10 7 M. 013 10.0 points Which pH represents a solution with 1000 times higher [OH ] than a solution with pH of 5? 1. pH = 7 2. pH = 4 3. pH = 6 4. pH = 3 5. pH = 5000 6. pH = 0.005 7. pH = 2 8. pH = 8 correct 9. pH = 1 Explanation: pH = 5 pOH = 14 - pH = 14 - 5 = 9 [OH ] = 10 pOH = 10 9 M [OH ] x = 1000 [OH ] = (10 3 )(10 9 M) = 10 6 M pOH x = -
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