What is the pH of an aqueous solution with hydrogen ion concentration equal to 3 × 10^–5.mol L^–l ? Is the solution acidic, basic or neutral?

Solution

Here [H⁺] = 3 × 10^–5 mol^–1We know,

pH space equals space minus log space open square brackets straight H to the power of plus close square brackets space equals space minus log space left parenthesis 3 space cross times space 10 to the power of negative 5 end exponent right parenthesis space space space space space equals negative open square brackets log space 3 space plus space log space 10 to the power of negative 5 end exponent close square brackets space space space space space space equals space minus open square brackets log space 3 space minus space 5 close square brackets space space space space space open square brackets because space space log space 10 space equals space 1 close square brackets or space pH space equals space minus 0.4771 space plus space 5 space equals space 4.5229 space asymptotically equal to space 4.52 As space pH space greater than space 7 space comma space hence space solution space is space acidic.

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