5. Find the solubility in water (grams per Liter) at 20°C for each of the follow

Question

5. Find the solubility in water (grams per Liter) at 20°C for each of the following: a. NaHCO3-963 b. Na CO c. CaCl d. Ca(HCOsh e. CaCO Cite your source: 6. Find the commercial cost (dollar per kilogram) each of the following: (Hint: look at the websites of manufacturers like Sigma Aldrich for ACS grade). a. NaHCO b. Na CO c. CaCl2 d. Ca(HCO3)2 e. CaCO Cite your source: If you cannot find a commercial solid powder for any one of the chemicals above can you explain why it's not available? Did you find any suspicious product offerings?

Explanation / Answer

5. Solubility in water (grams per Liter) at 20 oC for,

a. NaHCO3 = 96 g/L

b. Na2CO3 = 215 g/L

c. CaCl2 = 745 g/L

d. Ca(HCO3)2 = 166 g/L

e. CaCO3 = 0.0062 g/L

6. Commercial cost (dollars per kilogram) for,

a. NaHCO3 = $1.4/kg

b. Na2CO3 = $106/kg

c. CaCl2 = $422/kg

d. Ca(HCO3)2 = No listing

e. CaCO3 = $320/kg

The Ca(HCO3)2 price is not found as the chemical is not very stable.

2. Strong acid reacts with limestone : It dissolves limestone

limestone is CaCO3

a. molecular equation,

CaCO3 (limestone) + 2HCl (acid) ---> CaCl2 (soluble) + H2O + CO2

b. net-ionic equation,

CaCO3 (limestone) + 2H+ (acid) ---> Ca2+ (soluble) + H2O + CO2

3. Marble statues in acid rain dissolves

CaCO3 + H2SO4 --> CaSO4 + H2O + CO2

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