CH-1089
pH scale
Chemistry · Secondary 4 · Hard · pH scale
A student tests three unknown solutions with universal indicator. The pH values obtained are 2, 7 and 12. Which statement about these solutions is correct?
- The solution of pH 2 is a strong alkali.
- The solution of pH 7 has equal concentrations of hydrogen and hydroxide ions.
- The solution of pH 12 has a higher concentration of hydrogen ions than the solution of pH 2.
- The solution of pH 7 is a weak acid.
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