May 15, 2024

How to Check The pH of Your Soap A Comprehensive Guide

3 min read
how to check the ph of your soap


Soap, a widely used personal care product, is formulated to cleanse and nourish our skin. However, did you know that the pH level of soap plays a crucial role in maintaining the health and balance of our skin? Understanding and monitoring the pH of your soap is essential to ensure it’s suitable for your skin type and to prevent potential irritations. In this article, we will explore why pH matters, how to check the pH of your soap, and provide you with valuable insights to keep your skin happy and healthy.

Understanding pH and Its Importance

The pH scale measures the acidity or alkalinity of a substance and ranges from 0 to 14. A pH of 7 is considered neutral, below 7 is acidic, and above 7 is alkaline. Our skin has a natural pH between 4.5 and 5.5, which is slightly acidic. This pH range is important because it helps maintain the skin’s protective barrier, retain moisture, and support beneficial bacteria.

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Soap pH and Skin Health

The pH level of soap directly affects its compatibility with our skin. If a soap’s pH is too high, it becomes alkaline and can disrupt the natural protective barrier of the skin, leading to dryness, irritation, and even inflammation. On the other hand, highly acidic soaps can cause excessive oiliness and sensitivity. It is crucial to choose a soap with a pH that closely matches the skin’s natural pH to ensure optimal skin health.

Methods to Check Soap pH

  • pH Test Strips pH test strips are an accessible and affordable option to measure the pH of your soap. Wet a small piece of soap, rub it on the strip, and compare the colour change with the provided chart to determine the pH level.
  • pH Metre A pH metre is a more accurate tool to measure the pH of your soap. Follow the manufacturer’s instructions to calibrate the metre, create a soap solution, and immerse the electrode to obtain an accurate reading.
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Interpreting the Results and Adjusting Soap pH

Once you have measured the pH of your soap, you can interpret the results as follows

  • pH below 7 Indicates acidic soap. If the pH is too low, consider adjusting it by adding small amounts of a mild base (such as sodium hydroxide) until you reach a balanced pH level.
  • pH above 7 Indicates alkaline soap. To lower the pH, you can add small amounts of a mild acid (such as citric acid) until you achieve the desired pH range.
  • pH within 4.5 to 5.5 Indicates a soap suitable for most skin types.

Frequently Asked Questions

How do you know if soap is pH neutral?

Soap bars don’t have a pH either until you add water by using them. A pH of 7 is neutral. Anything above that level is alkaline, and anything below it is acidic.

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What is the pH of soap after saponification?

Saponification, the chemical process in which lye and oils turn into soap, usually takes between 24-48 hours. After this time, the pH can be tested and it should be within the soap range of 7 to 10.


Checking the pH of your soap is a vital step in maintaining the health and well-being of your skin. By understanding the importance of pH and following the methods outlined above, you can ensure that the soap you use is compatible with your skin’s natural pH. Remember to select soap that falls within the optimal pH range to avoid skin issues and maintain a healthy skin barrier. Take charge of your skincare routine by prioritising pH and enjoy the benefits of balanced, radiant skin.

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