Determining Formula of a Hydrate

Lab Configuration

Unknown Hydrate

Acceptable Δ Between Heatings (g)

Anhydrous Salt Formula & Molar Mass

CaSO₄ | 136.14 g/mol | Expected x = 1

Mass Measurements (grams)

Enter all masses in grams. Only edit the blue-tinted input cells. After heating, the Δ row shows the difference between consecutive heatings — it turns green when complete (Δ ≤ acceptable threshold).

Measurement

Trial 1

Trial 2

Trial 3

Mass of empty crucible (g)

Mass of crucible + hydrated sample (g)

Mass crucible + sample after 1st heating (g)

Mass crucible + sample after 2nd heating (g)

Δ (1st → 2nd heating)

—

Mass crucible + sample after 3rd heating (g) (optional)

Δ (2nd → 3rd heating)

—

Calculations

Quantity	Trial 1	Trial 2	Trial 3
Mass of hydrated sample (g)	—	—	—
Mass of water in hydrate (g)	—	—	—
Mass of anhydrous salt (g)	—	—	—
Moles of water in hydrate (mol)	—	—	—
Moles of anhydrous salt (mol)	—	—	—
Calculated x (H₂O ratio)
Rounded x (whole number)

Results & Conclusions

Trial 1 Awaiting data…

Trial 2 Awaiting data…

Trial 3 Awaiting data…