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Is Distilled Water Acidic Or Basic?

September 11, 2021 4 min read

Is Distilled Water Acidic Or Basic

Distilled water is the most chemically pure type of water available, and it is also the safest to consume. Distilled water consists largely of full water molecules with few free ions. It’s less reactive than other liquid substances used for dilution. It is typically employed in chemical research. But is distilled water acidic or basic? Let’s find out!

pH Balance of Water

The negative logarithm of the real hydrogen ion concentration is the word itself, which loosely translates to “power of hydrogen.” Its pH measures the concentration of hydrogen ions in a solution. It indicates that hydrogen ion concentration falls when pH rises. The difference of one pH unit equals a tenfold change in hydrogen ion concentration. pH levels can range from 0 to 14. Acidic solutions have a pH between 0 and 7, while basic solutions have a pH between 7 and 14.

What Are Acids and Bases?

A pH of 7 indicates that the solution is completely neutral. A solution with a pH less than 7 is acidic, whereas one with a pH of more than 7 is alkaline. The further the reading deviates from 7, the more it indicates the liquid as alkaline or acidic.

Acid is a chemical that releases free protons in water according to the popular Bronsted-Lowry Theory of Acids and Bases. A base, on the other hand, is a protons-accepting molecule. Hydrochloric acid and sodium hydroxide are examples of powerful acids and alkalis. The pH of a solution will alter drastically if it adds either of these substances or something comparable.

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Is Distilled Water Acidic Or Basic?

It can even remove volatile solutes using sophisticated distillation procedures. We accomplish distillation by heating water to a high temperature, allowing the steam to condense in a tube, and collecting the condensation in a container. You can dissolve many compounds in water. Some of them may evaporate with it, but it retains salts and other solid solutes. If you use one of these, the collected condensate should be free of any solutes and have a pH of 7. That’s what you’ll discover if you measure the pH just after distillation, but it changes quickly.

A pH of 7 should be present in pure distilled water. But it’s somewhat acidic with a 5.8 because it absorbs carbon dioxide from the environment.

Distilled water’s pH level is slightly acidic. It’s because carbon dioxide gas dissolves in distilled water when it comes into contact with the air, resulting in a dilute carbonic acid solution. It’s also why demineralized water, a type of cleaned water, reacts badly with metals such as steel.

Hydronium (H301 ions) releases throughout the solution when it produces carbonic acid. It has the same impact as a surge of free hydrogen ions, which lowers the pH level:

H30+ + HCO3_ -> 2H20 + CO2 H2O + H2CO3 -> 2H20 + CO2 H2O + H2CO3 -> 2H20 + CO2 H2O + H2CO

A pH of little below 7, usually 6.9, is seen in very clean distilled water that has had little contact with air. However, this does not imply that distilled water is acidic. Its acidity is extremely low, as evidenced by regular rainwater’s pH of roughly 5.6, and is perfectly safe to touch.

What Is The Best Way To Determine The pH Of Distilled Water?

Purified water products, such as distilled or deionized water, rarely, if ever, have a high ionic presence. Determining the pH of distilled water can be extremely difficult because there aren’t enough ions in the solution for the pH electrode to work effectively.
It means that the pH reading of distilled water isn’t always reliable, and you can tell if the readings are fluctuating between figures. Adding a few drops of potassium chloride (KCI) to the solution is one technique to deal with this.

The presence of KCI increases the conductivity of the water. It’s because potassium chloride is an ionic molecule containing both K+ and Cl- ions. Adding this to distilled water before measuring the pH will not change the outcome, making it more stable and likely to yield reliable findings. You can also use sodium chloride (table salt) to make distilled water more conductive.


Is distilled water acidic or basic? With a pH of 7, pure distilled water is considered neutral in science, meaning it is neither acidic nor alkaline. Distilled water is particularly sensitive to the environment due to its high purity. Even a small amount of carbon dioxide from the air can cause it to become mildly acidic.

When you consume distilled water, it mixes with mildly acidic digestive enzymes in your saliva and then with very acidic digestive enzymes in your stomach a few seconds later. The stomach’s far stronger hydrochloric acid has a pH of 1.5 to 3.5, making it 100,000 times more acidic than the purified water with which it reacts.

Awesome Water Filters offers Distillers so you can conveniently make distilled water in the comfort of your homes.

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