Question

What is the pH of a 6.4 x 10^-10 M OH- solution

Answer 1

Answer: pH of the solution is 4.81

Step-by-step explanation:

pH is defined as the negative logarithm of hydrogen or hydronium ion concentration. It is basically the power of hydrogen ions.

Mathematically,

`pH=-\log[H^+]`

We are given:

`[OH^-]=6.4* 10^(-10)`

To calculate pH, we first calculate pOH of the solution and then subtract it from 14.

`pOH=-\log[OH^-]`

Putting the value of hydroxide ion concentration in above equation, we get:

`pOH=-\log(6.4* 10^(-10))=9.19`

Now, using the below equation:

`pH+pOH=14`

`\Rightarrow pH+9.19=14\\\\\Rightarrow pH=4.81`

Hence, pH of the solution is 4.81