Question

If the pH of a solution is 4.2, what is the concentration of Mg(OH)₂? Also could you please show how you got to the answer, thanks.

Answer 1

So from this we can say that concentration of [H+] is equal to 10 raised to negative of pH of the solution and can be written as

$[H+]=10^{−pH}$ so substituting the values in this equation we get $[H+]=10^{-4. 2}$.

Concentration of Mg(OH)₂=$6.31×10 ^{-5}$