What is the original molarity of a solution of ammonia whose

What is the original molarity of a solution of ammonia whose pH is 11.18?

Solution

Answer :-

Step 1)from the given pH , we can calculate the pOH of the base by using the relation between pH and pOH

pOH = 14 – pH

         = 14 – 11.18

         = 2.82

By using pOH we can calculate the [OH^- ]

[OH^- ] = 10^-POH = 10^-2.82

                          = 1.51 × 10^-3 M