29, A buffer is diluted to 25% of its initial strength with water, what happens

Question

29, A buffer is diluted to 25% of its initial strength with water, what happens to the buffer capacity? Choices: The buffer capacity decreases to one-quarter. The buffer capacity decreases to one-half The buffer capacity increases by adding one-quarter. The buffer capacity increases by adding one-half The buffer capacity remains the same as before 30. A chemist wants to make a pH 8.00 buffer. Two chemical combinations are available: hypochlororous acid (HCIO, Ka-35x108) with sodium hypochlorite, or sodium dihydrogen phosphate (NaH2PO4, Ka 1.3x10 8) with sodium hydrogen phosphate. Which chemical combination is best for the buffer? What [base]/[acid] ratio should be used?

Explanation / Answer

29) pH of a buffer solution of monoprotic acid HA is given as

pH = pKa + log [A-] / [HA]

Upon Dilution (decrease in the ionic solution ) , the pKa will change , therefore pH of the solution varies. But, pH will always approach 7 at extreme dilution as it approaches being pure water.

Diluting a buffer solution to 25% of its initial strength will decrease the buffer capacity by one-quarter.

Answering only first question due to policy and time constraints. Sorry to dissapoint you

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