Q.10.63 - An Introduction to General, Organic, and Biological Chemistry

Question

At rest, the $\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]$ of the stomach fluid is $2.0\times {10}^{-4}\mathrm{M}$̣ What is the pH of the stomach fluid.

Step-by-Step Solution

Answer

 The pH of the stomach fluid is $3.7$

Step 1: Given information

pH or "potential of hydrogen" is a scale used to specify the acidity or basicity of a watery solution. Acidic solutions are estimated to have lower pH values than basic or alkaline solutions.

Step 2: Explanation

Given,

The $\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right]$ of the stomach is $2.0\times {10}^{-4}M$

Using,

$$\begin{gathered} pH=-{\log }_{10}\left[{\mathrm{H}}_3{\mathrm{O}}^{+}\right] \\ pH=-{\log }_{10}\left[2\times {10}^{-4}\right] \\ pH=3.7 \end{gathered}$$