Solutions and molarity

Bell Ringer

What element am I?
1s22s22p5

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PRESENTATION TITLE

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Fill in the Blanks

What was your answer to the bell ringer?

Molarity Vocabulary

A dilute solution is one that contains a
small amount of solute.
A concentrated solution contains a large
amount of solute.
Concentration is the amount of
solute dissolved in a solvent at a
given temperature

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Vocabulary

A solution is a
homogenous
mixture of 2 or

more substances

The solvent is the
substance present

in the largest

amount

The solute is (are)
the substance(s)

present in the

smaller amount(s)

Concentration

•Unsaturated - has a less than the maximum
concentration of solute dissolved

•Saturated - has the maximum concentration of
solute dissolved (can see solid in bottom of solution)

•Supersaturated -contains more dissolved solute than
normally possible (usually requires an increase in
temperature followed by cooling)

Multiple Choice

Which of the following types of solutions has more room to dissolve solute?

• supersaturated

• saturated

• unsaturated

Multiple Choice

What is a solvent?

• The substance that does the dissolving in a solution.

• The substance that is being dissolved in a solution.

• The mixing of different substances.

• The process in which neutral molecules lose or gain electrons

Multiple Choice

Another name for a homogeneous mixture is 

• an element.

• a solution.

• a compound.

Multiple Choice

The concentration of a mixture can be increased in which of the following ways?

• Heating the mixture

• Adding more water “solvent”

• Adding more powder “solute”

• Stirring the mixture

Multiple Choice

Which of the following will produce crystals if cooled or disturbed?

• unsaturated solution

• saturated solution

• supersaturated solution

• all of the above

Objectives

Understand the difference between dilute,
concentrated and super saturated
Understand the parts of a solution
Calculate Molarity

Molarity Formula

Molarity (M) is the number of moles of solute dissolved in one liter of solution.

16.2

How great is Gatorade?

Look at the
ingredients…
What does
the order
indicate?

Volume

of a

serving

NaCl

sugar

Concentrations

 Assume that the sugar is sucrose. What

is the molarity of the solution? According
to the label, there is 21 g sugar and 355
mL in the bottle.

Math Response

What is the molarity of the sugar in the gatorade?

Type answer here

Correct Answer: 0.173

Deg^°

Rad

Concentrations

 Let’s look at the NaCl. There is 160

mg per serving. What is the molarity
of the salt in solution?

 Let’s ignore everything else. ☺

Dilutions and Molarity

Use this formula to make a more dilute solution
from a concentrated solution

Molarity1 x Volume1 = Molarity2 x Volume2

(Concentrated)

(Dilute)

(before) = (after)

M1V1 = M2V2

Math Response

What is the molarity of the salt in the Gatorade?

Type answer here

Correct Answer: 0.008

Deg^°

Rad

Example Problems

What volume of 5 M NaOH is needed to create a 100 mL solution
of 1 M NaOH?

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Option #1

https://teachchemistry.org/classroom-resources/preparing-
solutions-simulation
Show me your screen for a grade.

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Math Response

How much did you need in the previous question?

Type answer here

Correct Answer: 20

Deg^°

Rad

Option #2

Kool-Aid Lab
No trash in sinks
Pick-up after yourself

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