# Hydrogen Ion Concentration Calculator from pH and pOH

## Welcome to the Hydrogen Ion Concentration Calculator

The Hydrogen Ion Concentration Calculator is a versatile tool designed to facilitate the calculation of the hydrogen ion concentration ([H^{+}]) in a solution based on the given pH or pOH values.

This calculator is instrumental in understanding the basic principles of acid-base chemistry and provides insights into the alkalinity or basicity of a solution.

## How to Use the Calculator?

**Input Selection:** Users have the flexibility to input either the pH or pOH value, choosing the appropriate selection from the dropdown menu.

**Data Entry:** Enter the pOH or pH value into the designated field.

**Calculation:** Upon clicking the “Calculate” button, the calculator swiftly processes the input and computes the corresponding [H^{+}] concentration and displays it along with the associated pH or pOH value.

## Measuring Hydrogen Ion Concentration from pOH and pH

**Relationship between pH, pOH, and Hydrogen Ion Concentration:** The hydrogen ion concentration ([H^{+}]) in a solution can be calculated using the given pH or pOH values. Understanding the relationship between these parameters is fundamental:

**pH and pOH Relationship**: In an aqueous solution at 25°C, the sum of pH and pOH is always 14. This relationship remains constant due to the auto-ionization of water.

pH + pOH = 14

### Calculating Hydrogen Ion Concentration [H^{+}] from pH

Given the pH value, the hydrogen ion concentration can be determined using the formula:

**From pH Equation**: If the pH of a solution is known, the [H^{+}] concentration can be calculated.

pH = -log[H^{+}]

**Example**: For a solution with a pH of 4.3:

- Using the pH equation:
- pOH = 4.3
- -log[H
^{+}] = 4.3 - [H
^{+}] = 5.01 × 10^{-5}M

### Calculating Hydrogen Ion Concentration [H^{+}] from pOH

Similarly, [H^{+}] can be calculated when the pOH is given using the relationship between pH and pOH:

**From pH Equation**: If the pOH of a solution is provided, the [H^{+}] concentration can be deduced.

- pH + pOH = 14
- pH = 14 – pOH

**Example**: For a solution with a pOH of 5.6:

- Using the pH + pOH equation:
- pH + pOH = 14
- pH + 5.6 = 14
- pH = 14 – 5.6
- pH = 8.40

**Further Calculation**:

From the pH equation:

- pH = 8.40
- -log[H+] = 8.40
- [H
^{+}] = 3.98 × 10^{-9}M