Question

What is the [H+] of an HCl solution if the pH is measured to be 6? Select one: a. 1 X 10-7 M b. 1 X 10-6 M c. 6 X 10-6 M d. 8 X 10-1 M

Answer 1

`pH=-\log_(10) [H^+] \Rightarrow [H^+]=10^(-pH) \\ \\ pH=6 \\ \ [H^+]=10^(-6)=1 * 10^(-6)`

The answer is B. 1 × 10⁻⁶ M.

Answer 2

Answer : The correct option is,
`1* 10^(-6)M`

Explanation : Given,

The value of pH of HCl = 6

As we know that,

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

The formula of pH is :

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

Now put all the given values in this formula, we get the concentration of hydrogen ion.

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

`[H^+]=1* 10^(-6)M`

Therefore, the concentration of hydrogen ion is,
`1* 10^(-6)M`