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Question

When an aqueous solution contains both a weak acid (or weak base) and its conjugate base (or conjugate acid) it is called:


A
buffer
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B
water
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C
neutral acid
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D
conjugate base
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Solution

The correct option is A buffer
When an aqueous solution contains both a weak acid (or weak base) and its conjugate base (or conjugate acid) it is called a buffer solution. 
A solution whose $$ pH$$ does not change very much when an acid (or base) is added to it. The capacity of the buffer is a measure of how much acid (or base) must be added to it to change the $$pH$$ by one unit.

Chemistry

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