Chemistryhard · Past Paper
What is the pH of a solution where the hydrogen ion concentration is $2 \times 10^{-5}$ M? (Given $log 2 = 0.3$)
A5.3
B4.7
C5.0
D2.3
✓ Correct Answer: B — 4.7
pH = -log($2 \times 10^{-5}$) = -($log 2 + log 10^{-5}$) = -(0.3 - 5) = 4.7.
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