Name: ________________
Mixtures and Solutions Investigation 2 “Reaching Saturation” Study Guide
To help you prepare for this exam, please review the Solutions Up Close, The
Bends, and Summary: Reaching Saturation readings in your FOSS text. In
addition, please review all of the Investigation 2 worksheets, Big Ideas and
vocabulary. This test will be worth 17 points.
1. What is evidence that a solution has been made?
a. When you mix a solid & a liquid, the solid cannot be seen.
b. Solution – a mixture formed when 1 or more substances dissolve in
another; when a solute dissolves in a solvent.
c. Evidence could be if you filter the solution and use evaporation and see
if crystals form. If they form, then it proves that it was a solution
2. How do you know when a solution is saturated? What would you see in a
cup filled with a saturated solution?
a. When no more solute will dissolve and you can see the solute in the
cup.
3. How do you determine the mass of a mixture?
a. Amount of water + amount of solid added = mass of mixture
b. (Mass of Solute: You put 50 ml of water in a cup and put 50 ml of the
solution in the other cup and put the cups on the balance scale. Put the
weights in the cup of plain water until it balances. Once it balances,
count the weight, which is the mass.)
For example: What is the mass of the mixture when you have 100 ml of
water and 1 spoonful of salt (there are 5 grams per spoonful.) (Hint: use
multiplication to help you solve the problem.) (1 spoonful = 5 grams)
c. 100 mL + 5 g = 105 g
4. If you have a solution that consist (made of) 100 ml of water and 6
spoonful’s of salt and the cup was clear, with no salt on the bottom of the
cup.
This solution is not saturated
What would you observe if you had a cup filled with 100 ml of water and 5
spoonfuls of salt? Why would you think so?
5th Grade
Mixtures and Solutions
Investigation 2
a.
We would observe nothing at the bottom of the cup. Since 6
spoonfuls of salt did not saturate 100 mL of water, 5 spoonfuls will
not saturate 100 mL of water.
5. You will be asked to compare and contrast an Epsom Salt solution to a
Sodium Chloride (table salt) solution.
Same
Different
Are a type of salt
Takes more Epsom salt to saturate a
solution than Sodium Chloride
Are solutes
Crystals look different
Dissolved and made a solution
You can eat table salt
Small white grains
6. If you have 50mL of water and 5 spoons of salt, what is the mass?
a. 1 spoon = 5 grams, 5 spoons = 25 grams
b. 50mL + 25g = 75 grams
7. How would you figure out how many grams of solute (solid) is in a saturated
solution of 100mL?
a. Filter the solution
b. Weigh the solution
i. You put 50 ml of water in a cup and put 50 ml of the solution in
the other cup and put the cups on the balance scale. Put the
weights in the cup of plain water until it balances. Once it
balances, count the weight, which is the mass.
c. Subtract the amount of water from the total weight of solution to get
grams of solute
d. Example
i. 100ml water, total weight of solution is 150 grams
ii. 150 g – 100 mL = 50 g of solute
5th Grade
Mixtures and Solutions
Investigation 2