PART - 1 CH - 2 Acids, Bases and Salts — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10SciencePART - 1 CH - 2 Acids, Bases and Salts2 Marks
Question
Calculate the pH of 0.01 M HCl solution.
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Answer
HCl is a strong acid, hence it ionises completely. $\begin{array}{ccc} HCl ( aq ) \longrightarrow &H ^{+}( aq ) & + Cl ^{-}( aq ) \\ 0.01 M & 0.01 M & 0.01 M \end{array}$ $\begin{array}{l}\therefore\left[ H ^{+}( aq )\right]=0.01 M =1 \times 10^{-2} M \\ \text { Now, } pH =-\log _{10}\left[ H ^{+}( aq )\right]\end{array}$ $=-\log _{10}\left[1 \times 10^{-2}\right]=-[\overline{2} \cdot 0000]=2$
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