Question

. pH value of a solution is 12. It means that solution contains

Answer 1

Given:

pH of solution is 12.

To find:

What the solution contains?

Calculation:

• We know that at standard temperature of 25°C, the sum of pH and pOH is 14.

$pH + p(OH) = 14$

$\implies 12 + p(OH) = 14$

$\implies p(OH) = 14 - 12$

$\implies p(OH) = 2$

Now, we know that p(OH) is negative logarithm of concentration of hydroxyl ions:

$\implies p(OH) = 2$

$\implies - log_{10}[OH^{-}] = 2$

$\implies log_{10}[OH^{-}] = - 2$

$\implies [OH^{-}]= {10}^{ - 2} \: M$

So, solution contains concentration of hydroxyl ions = 10^(-2) Molar.