Consider 1.0 L of a buffered solution based upon HClO/NaClO where the concentrat

Question

Consider 1.0 L of a buffered solution based upon HClO/NaClO where the concentration of both the weak acid and conjugate base are 1.0M. Choose the statement that is true. When 0.5 equivalents of NaOH are added to the buffer the pH will be 7.54 A buffer based on HClO/NaClO would be a good choice to buffer a solution with a pH of 9.00 Adding more NaClO to the buffer will decrease the pH Adding 1.0 L of water to the buffer solution will not change the pH of the solution the system will still resist pH change after 2.0 moles of HCl have been added to the solution

Explanation / Answer

HOCl pka is 7.53 , hence we have pH = pka + log [NaClO] / [HOCl]

pH = 7.53 + log ( 1/1) = 7.53

Buffer is suitable for pH around 7.53

The correct statement is   Adding 1L of water to the buffer solution will not change pH of solution.

This is because water is neutral so doesnot contribute to change in H+ or OH- concentration much

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