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  4. Which one of the following has highest pH?

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Q. Which one of the following has highest pH?

JamiaJamia 2009

Solution:

Pure water has $ pH=7 $ $ N{{H}_{3}} $ solution is weakly, basic. So, $ pH>7 $ but not too large for $ 1\text{ }M\text{ }NaOH,\text{ }\!\![\!\!\text{ }O{{H}^{-}}]=1, $ $ [{{H}^{+}}]=\frac{{{10}^{-14}}}{[O{{H}^{-}}]}={{10}^{-14}} $ Hence, $ pH=-log\text{ }{{10}^{-14}}=14. $ $ C{{l}_{2}}+HO\xrightarrow[{}]{{}}HCl+HClO $ Hence, the solution is acid or $ pH<7 $ .