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sample CaCl2, M Moles of Ca2+ in 20 mL of solution Theoretical amount of CaCO3 precipitate...

sample CaCl2, M Moles of Ca2+ in 20 mL of solution Theoretical amount of CaCO3 precipitate Volume of .5M Na2CO3 (20% excess) Theortical water hardness, mg/mL
1 .400
2 .200
3 .500
4 .100
5 .050
6 .300

Each sample has been concentrated by a factor of 100

complete table

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Expert Solution

sample CaCl2, M Moles of Ca2+ in 20 mL of solution Theoretical amount of CaCO3 precipitate Volume of .5M Na2CO3 (20% excess) Theortical water hardness, mg/mL
1 .400*100 = 40 (20 mL/1000 mL)*40 M = 0.8 mol 0.8 mol*100 g/mol = 80 g 0.8*(120/100) mol/0.5 M = 1.92 L 80 g/20 mL = 4 g/mL = 4000 mg/mL
2 .200*100 = 20 (20 mL/1000 mL)*20 M = 0.4 mol 0.4 mol*100 g/mol = 40 g 0.4*(120/100) mol/0.5 M = 0.96 L 40 g/20 mL = 2 g/mL = 2000 mg/mL
3 .500*100 = 50
4 .100*100 = 10
5 .050*100 = 5
6 .300*100 = 30

Similarly, you can complete the 3rd, 4th, 5th and 6th rows.

All the very best !!!!!!!


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