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12 August, 17:18

In an experiment, a student gently heated a hydrated copper compound to remove the water of hydration. the following data was recorded:

1. mass of the crucible, cover and contents before heating 23.4g.

2. mass of empty crucible and cover.

3. mass of crucible, cover, and contents after heating to constant mass 20.94g

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  1. 12 August, 17:48
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    The unknown of this problem is the experimental percent of water in the compound in order to remove the water of hydrogen, given the following:

    Mass of crucible, cover and contents before heating 23.54 g

    Mass of empty crucible and cover 18.82 g

    Mass of crucible, cover, and contents after heating to constant mass 20.94 g

    In order to get the answer, determine the following:

    Mass of hydrated salt used = 23.54 g - 18.82 g = 4.72 g

    Mass of dehydrated salt after heating = 20.94 g - 18.82 g = 2.12 g

    Mass of water liberated from salt = 4.72 g - 2.12 g = 2.60 g

    Then solve the percent of water in the hydrated salt by:

    % water = (mass of water / mass of hydrated salt) x 100

    % water = 2.60 g / 4.72 g x 100

    % water = 55.08 % in the compound
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