Chapter 22 Sect. 2: Solubility and Concentration. What has to take place in order for a solute to be dissolved? Solvent molecules surround the solute particles and pull the solute particles into solution, and the complex spreads out evenly throughout the solution. Dissolving Review.
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What determines the amount of solute that is able to dissolve in a solvent?
The concentration of a solution refers to the amount of solute dissolvedin a solution
1. What is the concentration of a solution in grams/100 mL when 40 grams of solute dissolve in 200 mL of solution?
2. A solution contains 15 grams of solute in 30 mL of solution. What is the concentration of the solution in g/100 mL?
3. A solution has a concentration of 2 g/ 100 mL. If you have 600 mL of the solution, how many grams of solute do you have?Calculating Concentrations
= x = 20 g Answer: 20 g/100mL
= x = 50 Answer: 50 g/100mL
= x = 12 Answer: 12 g
There are three other terms that can be used to describe the concentration of a solution based on the amount of solute that is dissolved
unsaturated classroom – more students can still fit in the class
saturated classroom – can not fit anymore students
supersaturated classroom– adding more causes students to be displaced, or fall into aisles (precipitation)
A solubility curve is a graph showing the relationship between solubility and temperature (or sometimes pressure)
Use the solubility curve to the right to answer the following questions.
What is the solubility of Ba(OH)2 in 100 mL of water at 80˚C?
At about what temperature will 100g of water dissolve equal amounts of KNO3 and NaNO3? (Hint: 100g water = 100 mL water)
How many grams of KNO3 are needed to produce a saturated solution at 40˚C?
If 120g of NaNO3 are dissolved in 100g of water at 20˚C, is the solution saturated, unsaturated or super saturated?
If 70g of KI are dissolved in 100g of water at 30˚C, is the solution saturated, unsaturated or super saturated?Solubility curves Practice
~95g/100 mL water
Supersaturated (above the solubility line)
Unsaturated (below the solubility line)