What is the pH of 1 x 10^-2 mol/dm^3 sodium hydroxide at 25 degrees Celsius?
Answer and explanation
Correct answer: B. 12
- Step 1: NaOH is a strong base, so [OH-] = 10^-2 mol/dm^3 and pOH = 2.
- Step 2: At 25 degrees Celsius pH + pOH = 14, so pH = 12.
Answer
12.
Why not the others: '2' treats the solution as an acid of the same concentration; '16' adds pOH to 14 instead of subtracting; '9' adds the exponent to 7.
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