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whether distilled water is neutral?
Absolutely pure water would be pH 7.0, but even distilled water is not pure. It still contains lots of ions. Totally de-ionized water would be pH 7.0.
Deionized water will quickly acquire a pH when exposed to air. Carbon dioxide, present in the atmosphere, will dissolve in the water, introducing ions and giving an acidic pH of around 5.0. The limited buffering capacity of de ionised water will not inhibit the formation of carbonic acid H2CO3. Boiling the water will remove the carbon dioxide to restore the absence of a pH value. In practice, the indication from chemical indicators can give a value of usually between pH 5.0 and pH 9.0 depending on the indicator used.


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