ACS Bezique Events Practice Test 2026 – Your All-in-One Guide to Mastering the Exam!

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A solution contains 0.50 L of 1.0 M HCl and 0.50 L of 0.10 M NaOH. What is the pH after mixing?

pH ≈ 0.20

pH ≈ 0.35

Mixing a strong acid with a strong base is a neutralization where the moles determine what remains in solution. Here the acid provides 0.50 moles of H+, while the base provides 0.050 moles of OH−. All of the OH− reacts with an equal amount of H+, leaving 0.450 moles of H+ still in solution. The total volume after mixing is 1.00 L, so the hydrogen-ion concentration is 0.450 M. The pH is then −log10(0.450) ≈ 0.35. This matches the given choice. The other pH values would require different remaining [H+] that aren’t present here.

pH ≈ 2.00

pH ≈ 7.00