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Question

eople Window Help ching and learning resource from Cengage Learning Activity.do?locator-assignment-take&takeAssignmentSessionLocator-assignmer; Review Topics] nces Use the References to access important values if needed for this question. An aqueous solution contains 0.34 M ammonia. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) 0.35 mol NH4CIO4 0.17 mol HCIO4 0.17 mol Ca(OH)2 0.34 mol Ba(CIO4)2 O0.35 mol HCIO4 Submit Answer Retry Entire Group 7 more group attempts remaining

Explanation / Answer

Buffer is any substance which resists any change in pH. It is composed of weak acid and its salt with strong base or weak base and its salt with strong acid.

So, from above definition :

1) Since NH3 is a weak base, it must combines with its salt of strong acid ie 0.35M NH4ClO4

2) sodium hypochlorite is salt of strong base NaOH and weak acid ie hypochlorous acid, HOCl. So, 0.22 M HOCl would be required to prepare the given buffer.

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