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5 January, 12:54

A 43.63 gram sample of a hydrate of caseo4 was heated thoroughly in a porcelain crucible, until its weight remained constant. after heating, 36.45 grams of the anhydrous compound remained. what is the formula of the hydrate?

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  1. 5 January, 15:32
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    Let the hydrated compound be CaSO4. xH2O

    mass of the caso4 = 43.63g / (40+32+64+18x) * (40+32+64) = 36.45g

    136+18x = (43.63*136) / 36.45 = 162.78

    18x = 162.78 - 136 = 26.8

    x = 1.48 = 1.5

    Formula of hydrate = CaSO4.1.5H2O = 2CaSo4. 3H2O
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