Cobalt(II) chloride is commonly obtained from chemical supply houses as a hydrate with the
formula CoCl2 • 6 H2O. An analysis showed that 25.0 g of this hydrate contains 11.3 g of water.
What is the percent water by weight in this hydrate? Show all your calculations clearly
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To find the percent of water by weight in the hydrate, we need to calculate the mass of water and the mass of the hydrate.
Given:
Mass of the original hydrate (CoCl2 • 6 H2O) = 25.0 g
Mass of water (H2O) = 11.3 g
Step 1: Calculate the mass of the anhydrous salt (CoCl2)
We know that the mass of the hydrate includes both the mass of water and the anhydrous salt. Since we have the mass of water, we can find the mass of the anhydrous salt by subtracting the mass of water from the mass of the hydrate.
Mass of CoCl2 = Mass of the hydrate - Mass of water
Mass of CoCl2 = 25.0 g - 11.3 g
Mass of CoCl2 = 13.7 g
Step 2: Calculate the percentage of water in the hydrate
To determine the percent water by weight, we divide the mass of water by the total mass of the hydrate and multiply by 100.
Percentage of water = (Mass of water / Mass of hydrate) x 100
Percentage of water = (11.3 g / 25.0 g) x 100
Percentage of water = 0.452 x 100
Percentage of water = 45.2%
Therefore, the percent water by weight in the hydrate is 45.2%.