Gas Solubility

Solubility Trends

SOLIDS

Open Ended

Bell Ringer: How would you define a solution? What is an example of a solution?

Poll

PREDICT:

How does increasing the temperature of the solvent affect the solubility of a solid?

(Ex: dissolving sugar in water)

• solid will dissolve faster

• solid will dissolve slower

• temperature does not affect the dissolving of a solid

Multiple Choice

Is the relationship between temperature and solubility directly or inversely proportional?

• directly proportional

• inversely proportional

Temperature and Solubility

• Directly proportional

• Increasing temperature increases solubility

• Ex: Sugar dissolves better in hot tea than in iced tea

Poll

PREDICT: Do solids dissolve better when left alone or when stirred?

• left alone

• stirred

Stirring

Substances dissolve better when stirred

Poll

PREDICT:

Which substance will dissolve faster?

• sugar cube (larger surface area)

• sugar granules (smaller surface area)

Surface Area

The larger the surface area (particle size) the longer it takes to dissolve

Ex: A sugar cube takes longer to dissolve than sugar granules

Solubility Trends

GASES

Poll

PREDICT:

How does increasing the temperature affect the solubility of a gas?

• it increases gas solubility

• it decreases gas solubility

Gas Temperature and Solubility

Inversely proportional

Gas solubility increases at low temp.

(Ex: soda explodes in the freezer!)

Soda pop + dry ice

https://youtu.be/jlPq-_4oj5Q

Pressure and Solubility

Soda can: higher pressure

Soda in a cup: lower pressure

Which one do you think has more CO₂ gas?

Poll

Which one do you think has more CO₂ gas? Soda in a can or a cup?

• can (high pressure)

• cup (low pressure)

Poll

PREDICT:

Are pressure and gas solubility directly or inversely proportional?

• directly proportional

• inversely proportional

Pressure and Solubility of a Gas

directly proportional

Ex: Soda goes flat if you open bottle.

less pressure = less CO₂

Multiple Select

Which of the following would increase the solubility for a gas?

• Cooling the gas

• Increasing the pressure

• Increasing the temperature

• Decrease the pressure

Multiple Select

Which of the following would increase the solubility of a solid?

• Cooling the gas

• Increasing the pressure

• Increasing the temperature

• Crushing your solid

Summary

• Solids dissolve best when…

• Heated, stirred, ground into small particles

• ----------------------------------------------------

• Gases dissolve best when…

• temperature is low and pressure is high

Exit Ticket: Jamboard

Type your first name on a post it and write ONE thing that you learned today.