3/27 Class Practice; solubility curves

Poll

How is today going?

• Awesome Sauce

• Normal/content

• Tired

• It has been better

When you plot data and the data point ends up on the curve, the solution is saturated.

Below the curve, data points are unsaturated, and supersaturated data points are above the curve.

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Types of solutions

Multiple Choice

If you have a solution of KNO₃ at 20 degrees Celsius and 100.0 g, what is the type of solution?

• Saturated

• Unsaturated

• Supersaturated

• I am so lost (you probably need to come to tutoring)

Multiple Choice

What type of solution has 20 grams of NaCl at 40 degrees Celsius?

• Saturated

• Unsaturated

• Supersaturated

• I am so lost (you probably need to come to tutoring)

Multiple Choice

What type of solution has 25 grams of KNO₃ at 40 degrees Celsius?

• Saturated

• Unsaturated

• Supersaturated

• I am so lost (you probably need to come to tutoring)

Multiple Choice

70 grams of CaCl₂ dissolved in 100 grams of water at 30°C would make what type of solution?

• unsaturated

• saturated

• supersaturated

Multiple Choice

30 grams of KCl dissolved in 100 grams of water at 10°C would make what type of solution?

• unsaturated

• saturated

• supersaturated

Multiple Choice

20 grams of K₂Cr₂O₇ dissolved in 100 grams of water at 20°C would make what type of solution?

• Unsaturated

• Supersaturated

• Saturated

• Undefined

We can find the amount of solutes that can be dissolved at any given temperature.

You may also need to know what temperature a given amount of solute will dissolve

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Reading Solubility Curves

Multiple Choice

How much KNO₃ solute is saturated at 40 degrees?

• 75

• 55

• 65

• 85

Multiple Choice

At what temperature can you fully dissolve 120g of NaBr?

• 70

• 20

• 100

• You cannot determine this

Multiple Choice

At what temperature can you fully dissolve 60g of KNO₃?

• 27

• 30

• 37

• You cannot determine this

Multiple Choice

How much Ce₂(SO₄)₃ solute is saturated at 80 degrees?

• 20

• 15

• 30

• 2

Example: How much potassium chloride would dissolve in 250 grams of water at 40 degrees Celsius?

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Being able to use math to figure out how much you could dissolve.

Example: How much potassium chloride would dissolve in 250 grams of water at 40 degrees Celsius?

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39 C dissolves in 100 g of water

Being able to use math to figure out how much you could dissolve.

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Example: How much potassium chloride would dissolve in 250 grams of water at 40 degrees Celsius?

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39 = x

100 250

Being able to use math to figure out how much you could dissolve.

Example: How much potassium chloride would dissolve in 250 grams of water at 40 degrees Celsius?

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39 x 250 = 97.5

100

Being able to use math to figure out how much you could dissolve.

Multiple Choice

How many grams of KClO3 will dissolve in 200 grams of water at 30 degrees Celsius?

Choose the problem that is set up correctly.

• 10 = __x__

  100 200

• 18 = __x__

  100 200

• 30__ = __x__

  100 50

• I have no clue.

Multiple Choice

How many grams of NaNO3 will dissolve in 300 grams of water at 10 degrees Celsius?

Which number would you put for the "?"

? = __x__

100 300

• 10 = __x__

  100 300

• 18 = __x__

  100 300

• 80__ = __x__

  100 300

Go to Google Classroom now.

Today, you are completing the assignment in Google Classroom, and setting up your lab for tomorrow.