In the earlier post, you were showed how the universal indicator worked. The table here shows the pH values of some everyday substances.(Please click on the image if it is not clear enough for viewing.)
As mentioned, acids have a pH value of less than 7 while akalis have a pH value of more than 7. This shows that items like milk, potatoes, tap water, soft drinks, lemons and grapefruit are acidic substances. Meanwhile, items like baking powder, soap, toothpaste, indigestion tablets, bleach and limewater are alkaline substances. Since neutral substances have a pH value of 7, we can therefore tell that distilled water is a neutral substance.
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