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It means that there is more hydrochloric acid than is required to cause the reaction. its to do with ratios for example if you needed it to react with water (hypothetically) and the ratio required was 1:1 (again hypothetically) and you had 200ml of acid and only 100ml of water then 100ml would react of each giving you 200ml of the reacted "hydrochloric acidy water" (made that up its been a while since i done chemistry) and 100 ml "excess" of pure hydrochloric acid.

If its a practical experiment you are carrying out they tell you to use an excess for two reasons. to make sure you have enough to give the desired affect without having to be too precise and also unless you are working in optimal conditions ratios are never perfect. Depends on what level of chemistry you are at?

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16y ago

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