Engineering Board Exam Reviewer · Chemistry · hard

50 mL of 0.1 M HCl is mixed with 30 mL of 0.1 M NaOH. What is the pH of the resulting solution?

1. 7.00
2. 1.60
3. 1.00
4. 2.70

Answer

B. 1.60

Solution

Excess H+ = 0.005 - 0.003 = 0.002 mol in 0.080 L [H+] = 0.025 M pH = 1.60.

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