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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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iLearninPhys iLearninPhys
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11 years ago
The formula is CuSO4
Dry empty evaporating dish 81.76
mass of evaporating dish and hydrate sample 83.61
Mass of evaporating dish and anhydrous sample 42.94
How do i find the mass of the anhydrous salt?
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#1
11 years ago
The difference between the two measured values (respectively the hydrate and anhydrous sample) is the weight of the evaporated water. Therefore the weight of your anhydrous salt is 42.94 (Grams?). You didn't had to weigh the empty evaporating dish, since this weight doesn't change and it doesn't add any weight to your salt.
wrote...
#2
11 years ago
something is wrong with your figures.

Dry empty evaporating dish 81.76 and Mass of evaporating dish and anhydrous sample 42.94

this is not possible an empty dish cannot have a mass more than with the anhydrous.

re check the figures and use the following logic

dish with hydrate - dish with anhydrous = water

dish with hydrate - dish - water = anhydrous

GOOD LUCK
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