Question

The concentration of hydrogen ion in an acid is 4.8×10-3m. what is its pH

Answer 1

The pH of the acid is 2.699.

Given:

The concentration of hydrogen ions in acid is 4.8×10-3m.

To Find:

The pH.

Solution:

To find the pH we will follow the following steps:

As we know,

The concentration of hydrogen ions =

$[ {H}^{ + } ] = 4.8 \times {10}^{ - 3} M$

Also,

The pH of acid is given by the formula:

$pH = - log[ {H}^{ + } ]$

Now,

In putting values we get,

$pH = - log(2 \times {10}^{ - 3} ) = - log2 - log {10}^{ - 3} = - 0.3010 + 3log10 = 3 - 0.3010 = 2.699$

Henceforth, the pH of acid is 2.699.

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Answer 2

The pH of the acid is approximately 2.318.

To calculate the pH of an acid, you can use the formula:

pH = -log[H+]

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

Where [H+] is the concentration of hydrogen ions in moles per liter.

In this case, the concentration of hydrogen ions is 4.8×10^-3 M. So, we can plug that value into the formula and calculate the pH:

pH = -log(4.8×10^-3)

pH = -(-2.318)

pH = 2.318

Therefore, the pH of the acid is approximately 2.318.

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