All Your Questions Answered: How Concentrated Can Lye Solution Be Before Its pH Rises Above Calcium Hydroxide Saturated Water?

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When it comes to working with lye, it’s important to understand the concentration levels that are safe and effective. Lye, also known as sodium hydroxide, is a highly caustic substance that can cause severe burns and other injuries if not handled properly. One of the key factors to consider when working with lye is its pH level, which can affect its effectiveness and safety.

Understanding pH Levels

pH is a measure of the acidity or alkalinity of a substance, with a range of 0 to 14. A pH of 7 is considered neutral, while a pH below 7 is acidic and a pH above 7 is alkaline. Lye has a very high pH level, typically ranging from 13 to 14.

Calcium hydroxide, also known as slaked lime, is a compound with a pH level of around 12.4. When calcium hydroxide is dissolved in water, it creates a saturated solution with a pH level of around 12.4. This means that the water is at its maximum capacity for holding calcium hydroxide in solution.

The Relationship Between Lye and Calcium Hydroxide

When lye is added to water, it creates a highly alkaline solution with a pH level of around 13 to 14. This means that the solution is more alkaline than calcium hydroxide saturated water. However, as lye solution becomes more concentrated, its pH level can rise above the pH level of calcium hydroxide saturated water.

The exact concentration level at which this occurs can vary depending on a number of factors, including the temperature of the solution, the purity of the lye, and the amount of water used. In general, however, it is recommended that lye solutions be kept at a concentration of no more than 50% to ensure that the pH level does not rise above that of calcium hydroxide saturated water.

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Safe Handling of Lye

When working with lye, it is important to take all necessary safety precautions to avoid injury. This includes wearing protective clothing, gloves, and eye protection, as well as working in a well-ventilated area. Lye should always be added to water, never the other way around, to avoid splashing and potential burns.

If you are unsure about the concentration level of your lye solution, it is always best to err on the side of caution and dilute it further. Remember, the safety of yourself and those around you should always be your top priority when working with lye.


In conclusion, the concentration level of lye solution at which its pH level rises above that of calcium hydroxide saturated water can vary depending on a number of factors. However, it is generally recommended that lye solutions be kept at a concentration of no more than 50% to ensure safety and effectiveness. Always take proper safety precautions when working with lye, and if in doubt, dilute your solution further to avoid injury.


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