Unit+9+Solutions

What you need to know about solutions: You are just taking grams/mL to mol/L or molarity Start with your original grams over mL and multipy by 1000mL/1L then multiply by the atomic mass of the substance

Mole fraction is the moles of one substance over the total moles

1) A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring, B. the concentration of the solution will decrease. C. the concentration of the solution will remain the same. D. the volume of solution will increase. E. a supersaturated solution will be produced. 2) Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution. A. 0.304 M B. 0.349 M C. 1.35 M D. 3.29 M 3) Potassium hydrogen phosphate is used in the preparation of non-dairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution. A. 0.732 M B. 0.865 M C. 2.66 M E. none of these choices is correct 4) The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution? A. 0.0080 B. 0.0086 D. 0.45 E. 0.48
 * A. the concentration of the solution will increase.** more stuff added, higher concentrate
 * E. 6.01 M**
 * D. 4.97 M**
 * C. 0.066 mol of substance/total mol**