How Many Moles of HCl Need to Be Added to 150.0

question 152

Multiple Choice

How many moles of HCl need to be added to 150.0 mL of 0.50 M NaZ to have a solution with a pH of 6.50? (K_a of HZ is 2.3 × 10^-5.) Assume negligible volume of the HCl.

• A) 6.8 × 10^-3 mol
• B) 7.5 × 10^-2 mol
• C) 1.0 × 10^-3 mol
• D) 5.0 × 10^-1 mol
• E) none of these

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