Chemistrymedium · Past Paper
What is the concentration of $H^+$ ions in a solution with pH 5?
A$10^{-5}$ mol/L
B$10^5$ mol/L
C5 mol/L
D0.5 mol/L
✓ Correct Answer: A — $10^{-5}$ mol/L
The pH is defined as -log[H+], so [H+] = $10^{-pH}$.
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