Gravimetric_Analysis.docx - Gravimetric Analysis PRE-LAB QUESTIONS 1 Write a balanced equation for the precipitation of calcium carbonate from potassium

Gravimetric_Analysis.docx - Gravimetric Analysis PRE-LAB...

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PRE-LAB QUESTIONS 1. Write a balanced equation for the precipitation of calcium carbonate from potassium carbonate and calcium chloride. K2CO3+CaCl=CaCO3+2KCl 2. Using this balanced equation, determine the limiting reactant if 15 grams of calcium chloride was reacted with 15 grams of potassium carbonate. 15g of CaCl2 Moles=15/111=.135 15g of K2CO3 Mole = 15/138.2=.1085 Limiting reagent=K2CO3 3. Using your answer for Question 2, determine the mass of potassium carbonate needed to fully precipitate all the calcium from a 25 mL sample of 15% calcium chloride. (25*15/100)=3.75g of calcium chloride Moles of CaCl2 = 3.75/110.98=0.0338 moles The balanced reaction is K2CO3+CaCO3+2KCl So, 1 mole of CaCl2 requires 1 mole of K2CO3 for complete precipitation therefore 0.0338 moles of CaCl2 requires 0.0338 moles of K2CO3 mass of K2CO3 required 0.0338*138.21=4.67g 4. Gravimetric Analysis
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EXPERIMENT 1: GRAVIMETRIC ANALYSIS WITH CALCIUM CHLORIDE AND POTASSIUM CARBONATE Data Sheet Table 1: Data and Observations Material Mass CaCl 2 2g K 2 CO 3 2.5g Filter Paper 2.3g Watch Glass 32.8g
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