What is the pH of 1 x 10^-1 mol/dm^3 hydrochloric acid, assuming complete ionisation?
Answer and explanation
Correct answer: A. 1
- Step 1: HCl is a strong acid, so [H+] = 10^-1 mol/dm^3.
- Step 2: pH = -log10[H+] = 1.
Answer
1.
Why not the others: '13' gives the pOH-based value that applies to a base, not an acid; '-1' keeps the sign of the exponent; '8' adds 7 to the exponent.
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