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Yes, because if you are not, there could be an accident if too much of a chemical is added, and when you want to work out the amount of product produced or reactant used, without a large degree of uncertainty, you must be as precise as possible. (The less precise, the more uncertainties, the larger percentage error) But remember, you must be accurate and precise in order to get reliable results. Accuracy is the ability to have your experimental data match up with known results, and precision is the ability to obtain the same data more than once.

http://chemistry.about.com/od/chemistryquickreview/a/accuracyprecise.htm

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Q: Is it important to be exact when preparing a chemical reaction?
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