A buffer solution is used to maintain the pH of a solution. Buffer solution has a constant pH and it does not taking part in any reaction directly. Thus, option C is correct.
pH of a solution is the concentration of H+ ions in the solution. It measures how acidic or basic the solution is. The solution of pH 7 is neutral and solution with pH below 7 is acidic. Basic solutions has the pH above 7.
A buffer solution is used to maintain the pH of a solution in a constant either in acidic or basic range. There are two types of buffer solutions acidic buffer and basic buffers.
An acidic buffer is made by mixing a weak acid with its salt and a basic buffer is made by mixing a weak base with its salt. A buffered solution will change its pH up on the addition of an acid or base. Hence, option C is correct.
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