H04 Solutions - bleiweiss (emb853) H04: Acid-Base Mccord...

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bleiweiss (emb853) – H04: Acid-Base – Mccord – (90540) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points What is the hydroxide concentration [OH - ] in an aqueous solution in which the hydronium ion concentration [H 3 O + ] is 1 × 10 - 5 M? 1. 1 × 10 - 14 M 2. 1 × 10 - 5 M 3. 1 × 10 - 7 M 4. 1 × 10 - 9 M correct Explanation: [H 3 O + ] = 1 × 10 - 5 M K w = [H 3 O + ][OH - ] = 1 . 0 × 10 - 14 [OH - ]= K w [H 3 O + ] = 1 . 0 × 10 - 14 1 × 10 - 5 =1 × 10 - 9 M 002 10.0 points What is [H 3 O + ] when [OH - ] = 3 . 3 × 10 - 9 M? 1. 3 . 3 × 10 - 9 M 2. 1 . 0 × 10 - 7 M 3. 3 . 0 × 10 - 6 M correct 4. 3 . 3 × 10 - 5 M 5. 6 . 6 × 10 - 5 M Explanation: [OH - ] = 3 . 3 × 10 - 9 M K w = [H 3 O + ][OH - ] = 1 × 10 14 [H 3 O + K w [OH - ] = 1 . 0 × 10 14 3 . 3 × 10 - 9 =3 . 0 × 10 - 6 M 003 10.0 points What is [OH - ] when [H 3 O + ] = 8 . 2 × 10 - 5 M? 1. 8 . 2 × 10 - 5 M 2. 6 . 3 × 10 - 9 M 3. 1 . 2 × 10 - 4 M 4. 1 . 2 × 10 - 10 M correct 5. 1 . 0 × 10 - 7 M Explanation: [H 3 O + ] = 8 . 2 × 10 - 5 M K w = [OH - ][H 3 O + ] = 1 . 0 × 10 14 [OH - K w [H 3 O + ] = 1 . 0 × 10 14 8 . 2 × 10 - 5 . 2 × 10 - 10 M 004 10.0 points What is the conjugate acid oF NO - 3 ? 1. HNO 3 correct 2. NO 2 - 3. NH 3 4. NO 3 2 - 5. H + 6. OH - Explanation: Since the question asks For the conjugate acid, we can assume NO - 3 is acting as a base. This means that it is a proton acceptor. To Form the conjugate acid, it accepts a H making HNO 3 . 005 10.0 points Which is NOT a conjugate acid-base pair? 1. H 3 SO + 4 :H 2 SO 4 2. H 2 SO 4 : SO 2 - 4 correct
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bleiweiss (emb853) – H04: Acid-Base – Mccord – (90540) 2 3. H 2 :H - 4. H 2 O : OH - 5. HCl : Cl - Explanation: Except for H 2 SO 4 and SO 2 - 4 , the members of all of the pairs diFer by one proton. 006 10.0 points The hydronium ion concentration in a solu- tion at pH 10 has what relationship to the hydronium ion concentration in a solution at pH 13? 1. 3 times greater than 2. 100 times less than 3. 1,000 times greater than correct 4. 1,000 times less than Explanation: ±or pH 10 , M H + =1 × 10 - 10 ±or pH 13 , M H + × 10 - 13 007 10.0 points At 25 C, water solutions which are neutral have a pH of 1. about 0. 2. about 7. correct 3. in²nity. 4. about 14. Explanation: 008 10.0 points Calculate the resulting pH if 365 mL of 2.88 M HNO 3 is mixed with 335 mL of 1.10 M Ca(OH) 2 solution.
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H04 Solutions - bleiweiss (emb853) H04: Acid-Base Mccord...

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