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In a high school experiment for observing the rate of formation of precipitate with Silver Nitrate in the hydrolysis reaction of different haloalkanes (Chloroalkane, Bromoalkane, Iodoalkane), a water bath is used to equate the temperature of the mixtures before adding the haloalkanes.

If temperature changes occur in any one of these solutions, then it will heat up the water and for this reason the comparison of the rates of reaction will not be accurate. Why aren't the test tubes removed from the solution before the reaction begins?

Wouldn't it be better to conduct each experiment in an individual water bath or with no water bath at all? Am I missing another purpose the water bath serves?

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