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Difference Between pH and Titratable Acidity

July 5, 2018 Posted by Madhu

The key difference between pH and titratable acidity is that the pH measures the concentration of free protons in a solution whereas titratable acidity measures the sum of free protons and un-dissociated acids in a solution.

The acidity of a solution measures the ability of that solution to neutralize a base. This is because acids contain dissociable protons (H+ ions) and bases can release OH- ions. When the acid reacts with the base, the H+ ions and OH- ions react with each other to form water molecules (H2O). Hence, it is a neutralization reaction.

CONTENTS

1. Overview and Key Difference
2. What is pH
3. What is Titratable Acidity
4. Side by Side Comparison – pH vs Titratable Acidity in Tabular Form
5.  Summary

What is pH?

The pH is a measurement of the concentration of free protons (H+ ions) in a solution. These protons are the H+ ions that dissociate from acids. Therefore, by measuring the pH of a solution, we can measure the acid strength of a solution. It means that we can measure the capability of that solution to neutralize a base. If a solution is acidic, the pH value is less than 7. But if the solution is alkaline, the pH of that solution is above 7.

Difference Between pH and Titratable Acidity

Figure 01: pH Scale

We consider the pH 7 as the neutral pH value. We can measure the pH of a solution using a pH meter. The equation for the calculation of pH using the free proton concentration is as follows;

pH = -log [H+]

What is Titratable Acidity?

Titratable acidity (TA) is a measure of the total acidity as an approximate value. It means that the titratable acidity gives the sum of free protons and un-dissociated acids in a solution. But, it is an approximation of total acidity because it cannot measure all the acidic species in the solution (total acidity is a more accurate measurement).

The unit of measurement of this parameter is grams per litre (g/L). Further, this acidity gives the total concentration of protons in a solution that can react with a strong base to neutralize the base. Ex: NaOH is a strong base which is commonly used in the measurement of TA.

What is the Difference Between pH and Titratable Acidity?

pH is a measure of the concentration of free protons (H+ ions) in a solution and this parameter is unit-less. Whereas, titratable acidity (TA) is a measure of the total acidity as an approximate value. The unit of measurement for this parameter is grams per litre (g/L). This is the main difference between pH and titratable acidity.

Difference Between pH and Titratable Acidity in Tabular Form

 

Summary – pH vs Titratable Acidity

pH and titratable acidity are very important parameters in determining the soil quality using a soil solution. The difference between pH and titratable acidity is that the pH measures the concentration of free protons in a solution whereas the titratable acidity is a measure of the sum of free protons and un-dissociated acids in a solution.

Reference:

1. “Titratable Acidity.” Milk The Funk Wiki. Available here  
2. “PH.” Wikipedia, Wikimedia Foundation, 2 July 2018. Available here   

Image Courtesy:

1.’Power of Hydrogen (pH) chart’By Hans Kirkendoll – Own work, (CC0) via Commons Wikimedia  

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Filed Under: Analytical Chemistry

About the Author: Madhu

Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.

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