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CHEM #5 Quiz - 1(Points 4 The Ka of hypochlorous acid HClO...

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1.  (Points: 4)      The K a of hypochlorous acid, HClO, is 3.5 × 10 -8 . What [ClO - ]/[HClO] ratio is necessary to make a buffer with a pH of 7.71? Paragraph  Insert equation    Save Answer     2.  (Points: 4)      A buffer contains 1.0 mol CH 3 CO 2 H and 1.0 mol CH 3 CO 2 - diluted with water to 1.0 L. How many moles of NaOH are required to increase the pH of the buffer to 5.10? (p K a of CH 3 CO 2 H = 4.74) Paragraph  Insert equation    Save Answer     3.  (Points: 4)      A volume of 25.0 mL of 0.100 M HCO 2 H(aq) is titrated with 0.100 M NaOH(aq). What is the pH after the addition of 12.5 mL of NaOH? ( K a for HCO 2 H = 1.8 × 10 -4 ) Paragraph  Insert equation    Save Answer  
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1.  (Points: 4)      4.  (Points: 4)      What is the effect of adding 10 mL of 0.1 M NaOH(aq) to 100 mL of 0.2 M NH 4 + (aq)? 1. 2. 3. a.  1 only b.  2 only c.  3 only d.  2 and 3 e.  1, 2, and 3   Save Answer     5.  (Points: 4)      Which of the following combinations would be the best to buffer an aqueous solution at a pH of 5.0?
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1.  (Points: 4)      Save Answer     6.  (Points: 4)      Each of the following mixtures can produce an effective buffer solution EXCEPT   Save Answer    
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