NLN NEX Chemistry Practice Test

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What is the pH of a 0.20 M NaOH solution?

13.30

12.00

14.00

A strong base like NaOH dissociates completely in water, so the hydroxide ion concentration equals the base concentration: [OH-] = 0.20 M. Use pOH = −log[OH−]. Since log(0.20) ≈ −0.699, pOH ≈ 0.70. At room temperature, pH and pOH sum to 14, so pH = 14 − 0.70 ≈ 13.30. This high pH reflects a strongly basic solution.

7.00

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