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Between deionised water and distilled wa...

Between deionised water and distilled water which one is more pure and why?

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Both deionised and distilled water are free from ions. Yet distilled water is superior to deionised water in terms of purity. This is because of the fact that deionised water contains small amount of dissolved silica, `CO_(2)` along with some germs and organic impurities. However, distilled water prepared in glass apparatus does not contain any impurities other than trace amounts of silica and `CO_(2)` .
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