A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of...

A buffer is prepared by adding 150 mL of 1.0 M NaOH to 250 mL of 1.0 M NaH₂PO₄. How many moles of HCl must be added to this buffer solution to change the pH by 0.25 units? Assume the total volume remains unchanged at 400 mL.
For H₂PO₄^-, K_a = 6.3 × 10^-8.

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Comment in case of any doubt.

queen_honey_blossom answered 5 months ago

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