chem125E2 - Salts Dissolved in Water Solubility in Water 20...

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Experiment 2: Precipitation and Water Purity Discussion Question 5 Jessica Stanley Laura Hyde Bobby Gonzalez
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Solubility, Precipitation, and Solvent Polarity The more soluble the salt and the more polar the solvent, the less likely it is to form a precipitate Polar water molecules reduce the effective charges of the ions in the solid and thus salt ions dissociate and the salt dissolves
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Class Data H2O CH3COCH3 C6H14 Cation and Anion # Teams Lots Slight None Unsure Lots Slight None Unsure Lots Slight None Unsure Pb2+;OH- 125 99 16 9 1 4 42 76 3 4 4 114 2 Pb2+;I- 130 119 3 7 0 1 73 51 4 7 4 116 1 Ca2+;C2O4- 87 77 2 6 0 1 28 54 2 4 2 80 1 Ca2+;OH- 186 164 9 12 0 0 58 120 5 1 7 176 0 Ag+;I- 136 113 7 12 1 6 59 65 5 9 4 122 0 Zn2+;OH- 116 73 21 19 2 3 35 75 2 4 5 105 2 By looking at the class data, one can observe that salts are more soluble in solvents with higher polarity.
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Unformatted text preview: Salts Dissolved in Water Solubility in Water 20 40 60 80 100 120 140 160 180 Cation and Anion Pair Lots Slight None Unsure Salts Dissolved in Acetone Solubility in Acetone 20 40 60 80 100 120 140 Cation and Anion Pairs Lots Slight None Unsure Salts Dissolved in Hexane Solubility in Hexane 20 40 60 80 100 120 140 160 180 200 Cation and Anion Pairs Lots Slight None Unsure Discussion Question 5 If a drum of acetone accidentally spills into Utahs Great Salt Lake is it likely that NaCl will precipitate? The concentration of NaCl in the Great Salt Lake is ~6M. The CRC Handbook reports the solubility of NaCl=35.7 g/100cc at 0C. Answer It is not very likely that NaCl will precipitate in the acetone because NaI, which has similar properties to NaCl, did not form a precipitate when we mixed it with the acetone....
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chem125E2 - Salts Dissolved in Water Solubility in Water 20...

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