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Why does pure water have pH value?

Updated: 9/20/2023
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The water molecule is made up of hydrogen and oxygen, H2O. One of the hydrogen atoms is able to leave the water molecule, leaving behind OH- and H+. This happens, to a certain degree, in pure water such that in every liter of water, 10-7 moles of water will dissociate into OH- and H+. This is described by the equilibrium constant of water deprotonation.

pH is calculated as -log10[H+]. Because [H+] = 10-7, pH = 7. We consider this "neutral" because it is the pH that our bodies, and most of the rest of the biological organisms found in nature, use.

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Q: Why does pure water have pH value?
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Related questions

How many pH value does pure water have?

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What is the pH value of unpolluted rainwater?

Pure water has a ph of 7.


What is the highest possible PH for pure H2O?

Pure water has only one value of pH, that is 7, which is the pH for a neutral solution.


Can rainwater have a pH of 7?

Pure water (distilled and non-aerated) would have a pH value of 7.0


What is the pH of boiling water?

Normal water contains impurities and minerals, so during boiling, these impurities are expelled, but this changes the pH value a little, thus the pH value would be about 7. Boiling pure water (pH7), will result in boiled pure water being at pH value 7, as there are no impurities or minerals in it


Pure water has a pH level of?

Pure water has a neutral pH value of 7, anything above 7 is alkaline and anything below 7 is acidic.


The H positive ion concentration of a solution can be represented as its pH value the pH of a solution is defined as negative log10 of the hyrdogen ion concentration what is the pH of pure water?

If your question is what is the pH of pure water, then the answer is seven, which means water is neutral.


What pH is pure water?

pure water is neutral with a pH of 7


Why does pure water have a 7pH value?

Because water is a neutral and high pH values are basic and low pH values are asidic.


What will be the pH of pure water?

At 100C the pH of pure water is 6.14 which is neutral


Why the pH value of salt water is 8?

The solution of pure sodium chloride is neutral.


Why is the pH value of pure water pH 7?

Because water is completely neutral, since it is HOH, which means equal number of hydrogen and hydroxide ions.