Composition of Hydrates Lab Results: Lab Data a) Mass of evaporating dish (after heating) b) Mass of evaporating dish + hydrate c) Mass of evaporating dish + anhydrous salt Calculations d) Mass of hydrate used (b – a) e) f) g) h)

Mass of anhydrous salt (c – a) Mass of water lost (b – c) Percentage of water in hydrate Percent error

(True value: 36%)

__________g __________g __________g

_________g CuSO4·x H2O _________g CuSO4 _________g H2O _________ % H2O _________ %

Exploration i) Moles of CuSO4 in sample

___________ mol CuSO4

j) Moles of H2O in sample

___________ mol H2O

k) Mole ratio of CuSO4 to H2O

____ : ____

l) Formula of hydrate

____________ CuSO4 ·x H2O

(convert data from “e” to moles using the molar mass of CuSO4) (convert data from “f” to moles using the molar mass of H2O)

(choose the smallest value from “i” and “j” and divide both “i” and “j” by that value) (use ratio from “k” as the unknown coefficient for water in CuSO4 ·x H2O)

(use 4 significant figures)

(use 4 significant figures)

CuSO4 : H2O

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