# pH and pOH Calculator

Free pH and pOH Calculator determines the pH and pOH of the solution in a short span of time. Provide chemical formula, and pH of density in the given input section and hit the calculate button to get the respected pH and pOH values quickly.

**Ex:** 0.03, 0.45, 0.34 or 0.0034

### What is pH and pOH?

pH is defined as the negative logarithm of H^{+} ion concentration. So, it is abbreviated as the power of hydrogen. pH is a measuring tool for acids and bases. The formula of pH is along the lines:

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

pOH is the measure of alkalinity and acidity of a solution by finding the concentration of OH^{-} ions. It is the negative logarith of OH^{-} ion concentration.

**pOH = -log[OH ^{-}]**

### Relation Between pH and pOH

pH is the negative logarithm of hydronium ion and pOH is the negative logarithm of hydroxy ion concentration.

i.e pH = -log[H^{+}] or -log[H_{3}O^{+}]

pOH = -log[OH^{-}]

We know that [H_{3}O^{+}][OH^{-}] = 10^{-14} at 25^{0}C

By taking log on both sides

log[H_{3}O^{+}][OH^{-}] = log(10^{-14})

log[H_{3}O^{+}] + log[OH^{-}] = -14

-log[H_{3}O^{+}] - log[OH^{-}] = 14

**pH + pOH = 14**

### How to Calculate pH and pOH?

- Get the H
^{+}ion concentration. - Find the negative logarithm of the value to know pH value.
- Subtract 14 from pH value to find the pOH value.

**Example:**

Find the pH and pOH of the solution in which the concentration of hydronium ion is 8 x 10^{-8} M.

**Solution:**

The hydronium ion concentration is 8 x 10^{-8} M

pH = -log[H_{3}O^{+}]

= -log[8 x 10^{-8}]

= 7.09

pOH = 14 - pH

= 14 - 7.09

= 6.91

Therefore, pH = 7.09, pOH = 6.91

Have a glance at the online calculator tools from chemistrycalculatorpro.com & enhance your chemistry skills and understand the concepts easily.

### FAQs on pH and pOH Calculator

**1. How to calculate pH and pOH?**

To calculate pH, take the negative log of the hydrogen ion concentration. pOH is obtained by subtracting 14 from the pH value.

**2. What is the formula to calculate pOH?**

The formula to calculate pOH is pOH = -log[OH^{-}].

**3. What is pOH in relation to pH?**

The relation between pH and pOH is pOH = 14 - pH.

**4. What is pH measurement?**

In chemistry, the term pH denotes the potential of hydrogen. pH is the measurement for alkalinity and acidity. The usual pH range is from 0 to 14.