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Question
A buffer solution is made by mixing a weak acid HA(Ka=10−6) with its salt NaA in equal amounts. What should be the amount of acid or salt that should be added to make 90 ml of buffer solution of buffer capacity 0.1?
A buffer solution is made by mixing a weak acid HA(Ka=10−6) with its salt NaA in equal amounts. What should be the amount of acid or salt that should be added to make 90 ml of buffer solution of buffer capacity 0.1?
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Solution
The correct option is D 9 mmoles
Buffer capacity is the number of moles of acid (or base) required by one litre of a buffer solution for changing its pH by 1 unit.
The buffer capacity of the solution is 0.1.
Hence, to change pH for 1 L of solution by 1 unit, 0.1 moles of acid or base are required.
Hence, for 90 mL of the solution, the number of moles of acid/base required are 90mL×0.1mol1000mL=9mmol
Buffer capacity is the number of moles of acid (or base) required by one litre of a buffer solution for changing its pH by 1 unit.
The buffer capacity of the solution is 0.1.
Hence, to change pH for 1 L of solution by 1 unit, 0.1 moles of acid or base are required.
Hence, for 90 mL of the solution, the number of moles of acid/base required are 90mL×0.1mol1000mL=9mmol
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