Question

If pH = -log [H+], and the pH of lemon juice is 2.2, what is the concentration of hydrogen ions [H+] in gram atoms per liter? Round to the nearest ten thousandths.

Answer 1

The pH is calculated using the formula:

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

The question gives the pH of lemon juice to be 2.2.

Hence, the formula is written to be:

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

Multiply both sides by -1:

`\log[H^+]=-2.2`

Since the log is in base 10, we have:

`\log_(10)[H^+]=-2.2`

Apply the law of log