Title: Soft-Drink Recipes

Purpose: To gain experience with the concept of concentration

Q? What is concentration?

Date:

ConcentrationInvestigation 3

Part 1- Changing the Solute

Q? What happens to the concentration a solution when you increase the solute (the solid material)?

Soft Drink Recipes

What do you think?

Is the soft drink a mixture? Yes, when you put 2 or more things together they are a

mixture. Is the soft drink a solution? Yes, the solute (solid aka kool-aid) dissolved in the water

so it is a solution How could we test this to determine if our soft-drink is a

solution? You could use a filter.

Let’s make some observations

Let’s have a sample of each soft-drink

In table groups you will be called up to get sample 1 and 2.

Please wait to taste until given directions to.

What do you think?

Which soft-drink solution tasted sweeter?

Part- 2 Changing the amount of Solvent

Q? What happens to the concentration of a solution when you decrease the amount of solvent in the solution?

Soft-Drink Solutions A and B

Should be in notebook

Which soft-drink would you recommend?

Should be in notebook

LOL

WORD BANK:

Concentration- is the amount of material dissolved in a measure of a liquid.

To dilute is to make a solution less concentrated, usually by adding more liquid (solvent).

Volume is the three-dimensional space occupied by something. In this investigation it is the amount of liquid.

LOL cont.

Content:

What happens to the soft-drink solution when you increase the amount of powder in a given amount of water?

As the amount of solute (the kool-aid) in a solution is increased, the concentration goes up.

Concentration

Title: Salt Concentration

Purpose: To investigate the concentration of Salt solutions.

Date:

Q? Which salt solution is more concentrated?

How can we determine which salt solution is more concentrated?

Observations

Should be in notebook

Volume

What happened to the volume of our saturated Kool-Aid solutions in the bottles?

The volume increased

What happened when we made solution 2 with three spoons of salt?

The volume increased

When you use a balance to compare concentrations of solutions, you must compare equal volumes.

Should be in notebook

Concentration

If you compare equal volumes of two solutions on a balance, and one is heavier that the other, the heavier one is more concentrated

Part 3 & 4

Solution 2

Solution 3 had more water so it was diluted.

Solution 3

LOL

How can you determine relative concentrations of solutions?

When equal volumes of two solutions are compared on a balance, the heavier one is more concentrated.