OBJECTIVE LIFE SCIENCE
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the pKa of the weak acid in the buffer.
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the pH of the buffer.
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the total concentration of the weak acid and its conjugate base in the buffer.
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all of the above
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none of the above
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Detailed explanation-1: -Question: The capacity of a buffer to resist changes in pH upon addition of protons or hydroxide ions depends on the pka of the weak acid in the buffer.
Detailed explanation-2: -Buffer, as we have defined, is a mixture of a conjugate acid-base pair that can resist changes in pH when small volumes of strong acids or bases are added. When a strong base is added, the acid present in the buffer neutralizes the hydroxide ions (OH-start superscript, start text, negative, end text, end superscript).
Detailed explanation-3: -Buffer solutions contain high concentrations of both a weak acid and its conjugate base (or a weak base and its conjugate acid). Because these components can neutralize added H⁺ or OH⁻, buffers are highly resistant to changes in pH.
Detailed explanation-4: -Buffer capacity is the measure of a buffer’s ability to resist pH change. This ability depends on the concentration of the buffer components, meaning the acid and its conjugate base. A higher buffer concentration has a greater buffer capacity.
Detailed explanation-5: -A buffer is a solution that resists changes in pH upon the addition of a small amount of strong acid or strong base.