8 The Calcium In A 300 0 Ml Sample Of Natural Water Was Determined By Precipitating The Cation As Cac204 The Precipita 2 (43.31 KiB) Viewed 72 times
8. The calcium in a 300.0-mL sample of natural water was determined by precipitating the cation as CaC204. The precipitate was filtered, washed, and ignited in a crucible with an empty mass of 26.80 g. The mass of the crucible plus CaO (56 g/mol) was 26.90 g. Calculate the concentration of Ca (40.078 g/mol) in the water in units of g per 100 mL. 9. The calcium in a 200.0 mL sample of natural water was determined by precipitating the cation as CaC204. The precipitate was filtered, washed, and ignited in a crucible with an empty mass of 26.6002 g. The mass of the crucible plus CaO (56.077 g/mol) was 26.7134 g. Calculate the concentration of Ca (40.078 g/mol) in the water in units of g per 100 mL. 10. Write the charge balance equation for the following for a solution containing: Nat, OH ,H30+, Ca2+, F- H+, OH-, H2P04, HPO ?, and PO43- 11. Calculate the ionic strength of an aqueous solution of 0.03 M KNO3? 12. What is the ionic strength of a solution that is 0.05M in KNO3 and 0.1M in Na2SO4? 13. Calculate the ionic strength of a solution that is 0.10 M in FeCl3 and 0.20 M inFeCl2? 14. Calculate the molar concentration of ethanol in an aqueous solution that concentration 2.30g of C2H5OH 46.07 g/mol in 3.50 L of solution? 15. Calculate the molar concentration of HNO3 63.0 g/mol in a solution that has a specific gravity of 1.42 and is 70.5 % HNO3 (w/w)? 16. What is the molecular mass of formaldehyde CH20? 17. What is the molecular mass of glucose molecule C6H1206? 18. What mass of Ag2CO3 (169.9 g/mol) is needed to convert 2.33 g of Na2CO3 (106.0 g/mol) to AgNO3? What mass of Ag2CO3 (275.7 g/mol) will be formed?
10. Write the charge balance equation for the following for a solution containing: Nat, OH ,H30+, Ca2+, F- H+, OH-, H2PO4, HPO ?, and PO4? 1 11. Calculate the ionic strength of an aqueous solution of 0.03 M KNO3? 12. What is the ionic strength of a solution that is 0.05M in KNO3 and 0.1M in Na2SO4? 13. Calculate the ionic strength of a solution that is 0.10 M in FeCl3 and 0.20 M inFeCl2? 14. Calculate the molar concentration of ethanol in an aqueous solution that concentration 2.30g of C2H5OH 46.07 g/mol in 3.50 L of solution? 15. Calculate the molar concentration of HNO3 63.0 g/mol in a solution that has specific gravity of 1.42 and is 70.5 % HNO3 (w/w)?
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