1. Butylated hydroxytoluene (BHT) has the following molecule formula: C₁₅H₂₄O. Would you expect it to be readily excreted from the body or found stored in body fat?

Explain why.

2. An ore contains 5 g of Gold per ton of ore (1 ton = 908000 g). What is the concentration of the Au in the ore in ppm (parts per million)? HINT set up a proportion x ppm is to 1 million as 5 g is to gram equivalent of 1 ton.

3. 10.5 g of Na₂CO₃ is dissolved in 350 mL of solution. What is the molarity of the sodium carbonate?

4. Write down the chemical equation that describes the solubility reaction in the above question and give the concentration of each ion that is formed in the solution process.

5. What would be the freezing point of the following aqueous solutions. Kfp = 1.86 ^oC/m for water?

a) 0.10 m C₁₂H₂₂O ₁₁(sucrose) b) 0.10 m KBr c) 0.10 m CaCl₂

6. What is the osmotic pressure of an aqueous solution that contains 1.10 g of urea, (NH₂)₂CO, dissolved in 100 mL of solution at 20 ^oC?

7. In Chm 218 lab, a student determined the freezing point depression constant of t-Butanol to be 8.1 ^oC/m. The freezing point of 15.8 g of t-Butanol dropped from 24.1oC to 18.5^oC when 0.56 g of an unknown liquid was added. What is the molecular weight of the unknown liquid?

 8. Benzoic acid C₇H₆O₂ is only slightly soluble in water where as it is very soluble in basic aqueous solution. Explain.