A sample which is having 2.574g of CuSo4 x H2O was heated to 140 deg C, reweighed and cooled. The resulting solid was reheated to 400 deg C, reweighed and cooled. At last, this solid was heated to 1000 deg C, reweighed and cooled for the last time.
Original sample 2.574 g
After heating to 1000 deg C 0.812 g
After heating to 400 deg C 1.647g
After heating to 140 deg C 1.833 g
1. Calculate the formula of the original hydrate? Suppose that all the water of hydration is driven off at 400 deg C.
2. When the original hydrates is heated to only 140 deg C then determines the formula of the hydrate obtained.
3. Calculate the percent empirical formula and composition if the black residue obtained at 1000 deg C is an oxide of copper.