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Quiz 7-solutions

Quiz 7-solutions - Version 055 Quiz 7 fakhreddine(51650...

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Version 055 – Quiz 7 – fakhreddine – (51650) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices before answering. 001 2.0 points If 100 mL of 0.050 molar HCl is added to 50 mL of 0.100 molar NH 3 , the resulting solution will be 1. basic because excess NH 3 is present. 2. acidic because of hydrolysis of NH + 4 . cor- rect 3. basic because of hydrolysis of NH + 4 . 4. neutral. 5. acidic because excess HCl is present. Explanation: V HCl = 100 mL [HCl] = 0.05 M V NH 3 = 50 mL [NH 3 ] = 0.1 M n HCl = (100 mL)(0.05 M) = 5 mmol n NH 3 = (50 mL)(0.1 M) = 5 mmol NH 3 + HCl −→ NH + 4 + Cl - Equal numbers of moles of a strong acid and a weak base have reacted, so this is the equivalence point. The conjugate acid of the weak base hydrolyzes to produce H 3 O + and so the solution is acidic. NH 4 + H 2 O NH 3 + H 3 O + 002 2.0 points What is the pH when 100 mL of 0.1 M HI is titrated with 50 mL of 0.2 M LiOH?

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Quiz 7-solutions - Version 055 Quiz 7 fakhreddine(51650...

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