A Buffer Is Prepared by Adding 150 ML of 1

question 22

Multiple Choice

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 0.18 units? If necessary, assume the total volume remains unchanged at 400 mL.

• A)0.025 mol HCl
• B)0.063 mol HCl
• C)0.082 mol HCl
• D)0.50 mol HCl
• E)1.0 mol HCl

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