Chantia M. Samantha P. Dylan C.

Solubility Curves

Chemistry-Fall 2014

  • - Solubility Curves - a graphic representation of the variation with changing temperature of the solubility of a given substance in a given solvent.
  • - Used to determine the mass of solute in a given Measurement of water and a given temperature.
  •   Solubility? the maximum amount of solute that will dissolve in a certain amount of solvent at a given temperature
  • Solute = dissolved
  • solvent = does the dissolving
  • Temperature affects how much of the solute can be dissolved by the solvent.
  • The Solubility increases as the temperature increases
  • Solubility problems
    = amount of solute = amount of solute
    Amount of solvent       amount of solvent

Solubility Curves

  • HOW TO READ THE GRAPH
  • 1. Find the line
  • 2. Find the temperature and follow up to the line.
  • 3. Read across to the y-axis and this is the answer.
  • On the line=saturated (full cannot hold anymore solute)
  • Below the line=unsaturated (can hold more solute)
  • Above the line= supersaturated (holding more solute than it should, unstable condition)

http://teachers2.wcs.edu/high/rhs/casey.souders/Ch...

http://www.kentchemistry.com/links/Kinetics/Solubi...

http://staff.prairiesouth.ca/~chemistry/chem30/4_s...

Example

Find the curve for KClO3.

Temperature (blue dot)= 30 degrees

Grams= in the middle

At 30°C approximately 10g of KClO3 will dissolve in 100g of water. If the temperature is increased to 80°C, approximately 40g of the substance will dissolve in 100g (or 100mL) of water.

Temperature increased (red dot)= 80 degrees

Grams= close to 40, almost like 38 or 39

Work to solving out the problem

Activity

Questions

1. The 3 terms of a solubility curve are?

2. What is the purpose of a solubility curve?

3. If 100g of water is mixed with 10g of HCL then heated at a steady rate of 10 degrees c  a minute  eventually reaching 100 degrees c  would the solubility been increased or decreased?

4. Using graph 3, how many grams are in NaNo3 at the temperature of 10 degrees c?

5. Using graph 3, how many grams are in KNO3 at the temperature of 60 degrees c?

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