pH of Indicator Calculator

pH of Indicator Calculator

Calculate the pH of an indicator solution using the Henderson–Hasselbalch equation:
\[ \text{pH} = \text{p}K_{in} + \log\left(\frac{[\text{In}^-]}{[\text{HIn}]}\right) \]

* Enter the indicator's pK₍in₎ and the ratio [In⁻]/[HIn].

Step 1: Enter Indicator Parameters

Example: 7.00 (typical for many indicators)

Example: 1 (equal amounts give pH = pKin)

Formula: \[ \text{pH} = \text{p}K_{in} + \log\left(\frac{[\text{In}^-]}{[\text{HIn}]}\right) \]