Hydrate%20Lab%20Answers

1
Hydrate Lab Answers

• Detailed calculations shown
• Accurate data recorded (5 0.3)
• Correct calculation for water lost
• Q1 - Moles of water lost
• Q2 - moles of anhydrous salt (159.61 g/mol)
• Q3 - 5
• Q4 - CuSO45H2O
• Q5 - copper(II) sulfate pentahydrate
• Q6 - Turned back to blue, hydrate reforms
• Significant digits (kept enough, kept exact)

2
Sample Calculations

• hydrate 2.82 g anhydrous 1.80 g water 0.98 g
• 1.02 g 18.0 g/mol 0.05666 mol
• 1.80 g 159.61 g/mol 0.01128 mol
• 0.05666 mol 0.01128 mol 5.02
• CuSO45H2O
• copper(II) sulfate pentahydrate
• The colour turned back to blue when water was
  added, indicating that the hydrate reformed.

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