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pH Calculator
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In acid base systems, the hydronium ion concentration covers more than 14 orders of magnitude. It is greater than 1M in solutions of strong acids, 10-7M in pure water and about 10-14M in solutions of strong bases. pH stands for the "hydrogen power", "power of hydrogen", or "potential of hydrogen"

The precise formula for calculating the pH and pOH is

pH = - log[H+]
pOH = - log[OH-]
[H+] = 10-pH
[OH-] = 10-pOH

By knowing the value for pH and pOH the concentration of [H+] and [OH-] ions can be calculated.

## Steps for pH Calculator

Step 1 :

Read the problem and identify the values given.

Step 2 :

Substitute the value in the corresponding formula to calculate the unknown values.

pH = -log[H3O+]

pOH = - log[OH-]

[H+] = 10-pH

[OH-] = 10-pOH

Step 3 :

Using the value of pH identify the type of the given solution.

## Problems on pH Calculator

1. ### A 0.1M solution of acetic acid has a hydrogen ion concentration of 1.3 $\times$ 10-3M. Find the pH of the solution.

Step 1 :

The hydrogen ion concentration is 1.3 $\times$ 10-3M.

Step 2 :

pH = -log[1.3 $\times$ 10-3]

pH = -(2.89)

pH = 2.89

Step 3 :

The pH of 2.89 in this example is less than 7. This value indicates that the solution is definitely acidic.

The value of pH of the given solution is 2.89

2. ### Calculate the concentration of the given soultion whose pH value is given as 3.60.

Step 1 :

The pH value is given as pH = 3.60

Step 2 :

Substitute the value of pH in the respective formula to find the concentration of hydrogen ions.

[H+] = 10-pH

[H+] = 10-3.60

[H+] = 0.00025 = 2.5 $\times$ 10-4M

Step 3 :

The concentration of [H+] ion is 2.5 $\times$ 10-4M

The concentration value of [H+] ion 2.5 $\times$ 10-4M