The balance equation is
Na2CO3 (aq) + CaCl2 • 2H2O (aq) ---> CaCO3 (s) + 2NaCl (aq) + 2H2O (aq)
- Amount Of Substance 1 5 G The Balance Equation Is Na2co3 Aq Cacl2 2h2o Aq Caco3 S 2nacl Aq 2h2o A 1 (52.76 KiB) Viewed 37 times
- Amount Of Substance 1 5 G The Balance Equation Is Na2co3 Aq Cacl2 2h2o Aq Caco3 S 2nacl Aq 2h2o A 2 (40.82 KiB) Viewed 37 times
- Amount Of Substance 1 5 G The Balance Equation Is Na2co3 Aq Cacl2 2h2o Aq Caco3 S 2nacl Aq 2h2o A 3 (46.87 KiB) Viewed 37 times
Procedure 1 Review the following reaction, where sodium carbonate and calcium chloride dihydrate react in an aqueous solution to create calcium carbonate (solid precipitate formed in the reaction), a salt (sodium chloride), and water. Na2CO3(aq) +CaCl₂ 2H₂O(aq) → CaCO3(s) + 2NaCl(aq) + 2H₂O(aq) Put on your safety gloves and goggles. 3 Use the graduates cylinder to measure 25 mL of distilled water. Add 25 ml of distilled water to each of the two 100 ml. glass beakers. 4 Cut a small square of white paper and place it on the scale. Tare the scale by pressing the D/T button so that the scale reads 0.0 g. See Figure 3. 2
Figure 3. Tared scale with the small square of paper. 5 Use the plastic butter knife to measure 1.50 grams of the CaCl₂ 2H₂O onto the white paper square. 6 Carefully add the CaCl₂ 2H₂O to one of the beakers containing 25 mL of distilled water. Use the butter knife to transfer any residue remaining on the piece of paper. Swirl the beaker until the CaCl₂ 2H₂O is fully dissolved into the water. 7 Rinse the butter knife with distilled water and fully dry it with paper towels. 8 Use the information and examples provided in the Exploration to calculate how many moles of CaCl₂ 2H₂O are present in 1.50 g of CaCl₂ 2H₂O and then calculate how many moles of pure CaCl, are present in the 1.50 g of CaCl₂ 2H₂O. Record the answers in Data Table 1. 9 Use the information and examples provided in the Exploration (and values input into Data Table 1, in step 8) to determine how many moles of Na₂CO, are necessary to reach stoichiometric quantities. From that calculation, determine how many grams of Na₂CO are necessary to reach stoichiometric quantities. Record both values in Data Table 1. 10 Cut a new small square of white paper and place it on the scale. Tare the scale by pressing the D/T button so that the scale reads 0.0 g Refer to Figure 3 as needed. 11 Use the butter knife to measure the calculated amount of Na-CO₂, and carefully add it to the 25 mL of distilled water in the second 100 mL glass beaker. Use the butter knife to transfer any residue remaining on the piece of paper.