5 Facts on Ph Of Citric Acid : Types, Factors And Reasons

What is the pH of Citric Acid?

The pH of citric acid depends on its concentration in water. At a concentration of 0.1M, the pH of citric acid is approximately 2.2. At lower concentrations, the pH will be slightly higher, while at higher concentrations, the pH will be slightly lower.

What is the pH of other Organic Acids?

The pH of some common organic acids at 0.1 M concentration is mentioned below.

Name of Organic AcidpH Value
Citric acid (C6H8O7)3.1
Acetic acid (CH3COOH)2.9
Lactic acid (C3H6O3)2.4
Malic acid (C4H6O5)3.4
Tartaric acid (C4H6O6)3.0

What is the significance of knowing Citric Acid pH?

Knowing the pH of citric acid is essential for a variety of reasons, including

  1. Food and Beverage Industry: Citric acid is a common food additive used for its sour taste and preservative properties. The pH of citric acid is important in determining its effectiveness in various food products. The pH also affects the stability of other ingredients in the product, so it is crucial to monitor and adjust the pH accordingly.
  2. Pharmaceutical Industry: Citric acid is used in the production of many medications and supplements as a buffer to control the pH of the solution. The pH of citric acid is also important in determining its solubility and compatibility with other ingredients in the medication.
  3. Cleaning and Sanitization Industry: Citric acid is commonly used as a cleaning agent due to its ability to dissolve hard water deposits and remove rust stains. The pH of citric acid affects its cleaning effectiveness, so it is important to know the pH to determine the best concentration and application method for cleaning.

Factors Affecting the pH of Citric Acid

The pH of citric acid depends on several factors including

  1. Concentration: The pH of citric acid is directly proportional to its concentration. As the concentration of citric acid increases, the pH decreases.
  2. Presence of other substances: The pH of citric acid can also be affected by the presence of other substances in the solution. For example, adding a base to citric acid will result in a neutralization reaction, causing the pH to increase.
  3. Time: The pH of citric acid can also change over time due to a chemical reaction called hydrolysis, where water reacts with citric acid to produce other compounds. As hydrolysis occurs, the pH of the solution can change.

About the author

I am Leena Raswant, a chemistry postgraduate. I thrive on challenges and continually specified goals. I aim to learn, unlearn, relearn and spread my knowledge in the best possible ways.

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