Date Lab Sec. Name A. Precipitation of Cac,o,.11,0 from the Salt Misture Desk No

Question

Date Lab Sec. Name A. Precipitation of Cac,o,.11,0 from the Salt Misture Desk No. Unknown number 1. Mass of beaker (g) 2. Mass of beaker and salt mixture (g) 3. Mass of salt mixture (2) 4. Mass of filter paper (g) 5. Mass of filter paper and product after air-dried Trial I Trial 2 1s 1zG 002 2.574 or oven-dried (g) 6. Mass of dried product (g) 7. Formula of dried product B. Determination of Limiting Reactant 1. Limiting reactant in salt mixture (write complete formula) 2. Excess reactant in salt mixture (write complete formula) 2.932 Data Analysis 1. Moles of CaC,O:H,0 (or CaC O) precipitated (mol) 2. Moles of limiting reactant in salt mixture (mol) 3. Mass of limiting reactant in salt mixture (g) 4. Mass of excess reactant in salt mixture (g) g hydrate_ . formula of excess hydrate_ 5. Percent limiting reactant in salt mixture (%) 6. Percent excess reactant in salt mixture (%) 7. Mass of excess reactant that reacted (g) 8. Mass of excess reactant, unreacted (g) Show calculations for Trial 1 on next page. Experiment 8

Explanation / Answer

The Salt mixture contains Calcium Chloride (CaCl2) and Sodium Oxalate (Na2C2O4).

The reaction taking place between them is shown below

        CaCl2 (aq.) + Na2C2O4 (aq.) = 2NaCl (aq.) + CaC2O4 (s)

Calcium Oxalate is precipitated in this reaction and excess Sodium Oxalate remains in the solution.

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