Question

Rearrange the following equation and solve for x when the hydrogen ion concentration is 0.001 M.

pH= 2 + log x

(Recall that pH=−log[H+].)

Answer choices: x= 10, x= 0.20, x= 3

Answer 1

Answer : The correct option is, x = 10

Explanation : Given,

Concentration of
`H^+` ion = 0.001 M

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

First we have to calculate the pH.

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

`pH=-\log (0.001)`

`pH=3`

Now we have to calculate we the value of 'x'.

The given expression is:

`pH=2+\log x`

Now put the value of pH in this expression, we get:

`3=2+\log x`

`3-2=\log x`

`1=\log x`

`x=10`

Therefore, the value of 'x' is 10.