Question

Mm 2mCOO 19. Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x (3 points) 10-11 mol/L. Is this solution acididc, basic, or neutral? Show your work.

Answer 1

Answer: The hydrogen-ion concentration for the aqueous solution is $10^{-3}mol/L$ and solution is acidic.

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxyl ion concentration.  

$pOH=-\log [OH^-]$  

Putting in the values:

$pOH=-\log[1\times 10^{-11}]$

$pOH=11$

$pH+pOH=14$

\$pH=14-11=3$

$pH=-log[H^+]$

$3=-log[H^+]$

$[H^+]=10^{-3}M$

As pH is less than 7, the solution is acidic.