# Title: Soft-Drink Recipes Purpose: To gain experience with the concept of concentration Q? What is concentration? Date:

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Title: Soft-Drink Recipes Purpose: To gain experience with the concept of concentration Q? What is concentration? Date:

Concentration Investigation 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.

Lets make some observations Lets 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

Which soft-drink would you recommend?

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

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.

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.

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