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an acid is anything with a PH level of 7 and lower, anything from 7 to 14 is defined as a base! As the number goes lower that means that the substance is more acidic. for example if you have a substance that has a PH of 6 and a substance that has a PH of 3. the one with the PH of three is alot more acidic than the one with a PH of six. an acid can also be defined as a substance which donates Hydrogen ions in a chemical reation. they can usually be identified as they will start with a 'H' ie. HCl or HF (hydrochloric acid and hydrofluric acids, respectivly).

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13y ago

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