Question

Calculate the concentration of OH-in a solution that has a concentration of H+ = 8.1 x 10^−6 M at 25°C. Multiply the answer you get by 1010 and enter that into the field to 2 decimal places.

Answer 1

Answer:

The answer is 12.35

Explanation:

From the question we are given that the concentration of $H^{+}$ is $8.1 * 18^{-6}M$

 Generally The rate equation is given as

                                                           $K_{w} = [H^{+} ][OH^{-} ]$

and $K_{w}$ the rate constant has a value $1 * 10^{-14}$

     Substituting and making [$OH^{-}$] the subject we have

                                                 $[OH^{-} ] = \frac{1 * 10^{-14}}{[H^{+}]} = \frac{1 * 10^{-14}}{8.1 *10^{-6}} =1.235 * 10^{-9}$

                                                  $[OH ^ {-}] = 1.235 * 10^{-9}M$

                            Multiply the value by $10^{10}$ as instructed from the question we have  

                       Answer =   $1.235 * 10 ^{-9} * 10^{10} = 12.35$

Hence the answer in 2 decimal places is 12.35