Chemistry Hydrate Tool
Free Hydrate Water Percentage Calculator
Use this hydrate water percentage calculator to find the theoretical percent water by mass in a hydrate compound. Enter the molar mass of the anhydrous compound, the hydrate coefficient, and the molar mass of water.
Enter hydrate details
The calculator uses the hydrate formula format: anhydrous compound · nH₂O. For example, CuSO₄·5H₂O has 5 water molecules, so the hydrate coefficient is 5.
Formula used:
Mass of water = n × molar mass of H₂O
Molar mass of hydrate = molar mass of anhydrous compound + mass of water
Theoretical % water = (mass of water ÷ molar mass of hydrate) × 100
Mass of water = n × molar mass of H₂O
Molar mass of hydrate = molar mass of anhydrous compound + mass of water
Theoretical % water = (mass of water ÷ molar mass of hydrate) × 100
Theoretical Percent Water
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Hydrate Molar Mass
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Water Mass
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Anhydrous Mass
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Water Coefficient
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Selected hydrate/example
Custom hydrate
Anhydrous compound molar mass
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Water coefficient
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Molar mass of water used
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Mass from water of hydration
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Total hydrate molar mass
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Calculation
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This calculator gives the theoretical water percentage based on molar masses. Experimental percent water can differ because of heating error, incomplete dehydration, contamination, or measurement uncertainty.
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