What is the pH of distilled water?

distilled-waterBefore answering this question, we should know “what is distilled water?“. Distilled water is water that has been removed all the impurities. Therefore, distilled water only contains water molecules. It is known that pure water is not acidic or alkaline. And in pure distilled water, the number of hydrogen ions and hydroxyl ions is balanced. Therefore, distilled water is neutral and the ph of distilled water is 7.0 in theory. However, many factors can influence the ph of distilled water.


Pure distilled water has a neutral pH of 7.0 at 25 degrees centigrade. However, if temperature increases, the pH of distilled water will decrease. This doesn’t mean distilled water has become not neutral but acidic. The truth is that the neutral pH drops. And the water is also neutral because of its balanced hydrogen and hydroxyl ions.

The water labeled as distilled water doesn’t mean distilled water

On the market, there are many distilled water brands and their water is labeled as distilled water. However, this is not the truth. Some testing shows that distilled water on the market can be basic or acidic. Therefore, it is highly recommended to get a test trip which shows the pH by color. If you feel suspicious about the distilled water you buy, you can test it. This can help you find the ideal distilled water brands you can trust.

The distilled water fact:

Well, the fact is that we cannot easily get pure distilled water that has a pH of 7.0. And the following reasons can tell you more about distilled water facts.

  • Distilled water may contain a lot of contaminants because of improper distillation process and transportation.
  • Distilled water is not the water used in the lab, so the purity is not the same.
  • Distilled water is not stable and can easily absorb carbon dioxide in the air, so it tastes a little acidic. If distilled water is not sealed water, the water is a little acidic.

How to prevent distilled water from becoming acidic

  • Test distilled water you buy. If the pH deviates far from the pH of 7, you need to change another brand.
  • You can use a home water distiller to make distilled water at home. And this can help you control the whole distillation process and the water quality.
  • Don’t expose distilled in the air, or it will absorb carbon dioxide in the air, making it acidic.
  • Try best to drink fresh distilled water and don’t store it for a long time. If you need to drink distilled water, you’d better drink it after producing it. This can reduce the chance of contacting the air.

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