Supersaturated solutions of most solids in water are prepared by cooling saturated solutions. Supersaturated solutions of most gases in water are prepared by heating saturated solutions. Explain the reasons for the difference in the two procedures.
Chemistry 2e · 11.3 Solubility
Solubility: practice problems
5 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.
Exercises 19
Calculate the percent by mass of KBr in a saturated solution of KBr in water at 10 °C. See Figure 11.16 for useful data, and report the computed percentage to one significant digit.
Exercises 21
At 0 °C and 1.00 atm, as much as 0.70 g of O₂ can dissolve in 1 L of water. At 0 °C and 4.00 atm, how many grams of O₂ dissolve in 1 L of water?
Exercises 23
The Henry’s law constant for CO₂ is 3.4 10⁻² M/atm at 25 °C. Assuming ideal solution behavior, what pressure of carbon dioxide is needed to maintain a CO₂ concentration of 0.10 M in a can of lemon-lime soda?
Exercises 25
Assuming ideal solution behavior, how many liters of HCl gas, measured at 30.0 °C and 745 torr, are required to prepare 1.25 L of a 3.20-M solution of hydrochloric acid?
Key terms · 8
- Henry’s law
- the proportional relationship between the concentration of dissolved gas in a solution and the partial pressure of the gas in contact with the solution
- immiscible
- of negligible mutual solubility; typically refers to liquid substances
- miscible
- mutually soluble in all proportions; typically refers to liquid substances
- partially miscible
- of moderate mutual solubility; typically refers to liquid substances
- saturated
- of concentration equal to solubility; containing the maximum concentration of solute possible for a given temperature and pressure
- solubility
- extent to which a solute may be dissolved in water, or any solvent
- supersaturated
- of concentration that exceeds solubility; a nonequilibrium state
- unsaturated
- of concentration less than solubility
Learn 11.3 on the whiteboard
The tutor teaches the whole section, drawing it out step by step and answering your questions as you go.