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Properties of Matter: Investigation 3 –

Lab

 

 

 

 

 

 

 

MINDSET

This Investigation is designed to:

  • give you the opportunity to test the solubility of certain solid compounds in water,
  • provide you with the opportunity to test the miscibility of certain liquid compounds in water,
  • reinforce your experience with the Triple Beam Balance Use and Operation procedure and the Measuring Mass Using a Weigh Dish or Beaker procedure, and
  • promote your analysis of the relationship between the physical properties of compounds and the elements that compose compounds.

BE PREPARED

Student Preparation for the Investigation includes gathering the following materials.

Note: The materials are listed in your SDR. They are also listed below for your reference.

  • (1) liter pitcher of water
  • (5) weigh dishes
  • (8) empty 400 ml beakers
  • (1) triple beam balance
  • (1) marker
  • (8) 2 cm pieces of masking tape
  • (1) 100 ml graduated cylinder
  • (1) plastic eye dropper
  • (1) pair of vinyl gloves per student
  • (1) pair of goggles per student
  • (1) centrifuge tube filled with 2 ml of red food coloring
  • (1) glass stir rod

INVESTIGATE

  • You will test the solubility of each sample solid compound in water.
  • You will also test the miscibility of each sample liquid. 
  • Reflect on the PreLab video as you move through the procedural steps.
  • During the Experiment, every procedural step is important. If one step is skipped, data can become invalid. Read each step thoroughly, complete the step, then check it off (Read it – Do it – Check it off).
  • Complete each procedural step in your SDR.
Note: The procedural steps are listed below for your reference.
  1. Review the chemical formula and elemental composition of each solid compound.

a. Locate the formulas in Table A. Make a prediction: Which solids do you think will be soluble in water?

b. Record: Write your predictions in Table A.

Test your predictions:

a. Obtain a small sample of each compound from the distribution center.

b. Use a graduated cylinder to add 100 ml of water to five 400 ml beakers.

c. Use tape and a marker to label each beaker.

d. Measure 10 g of each solid compound using a weigh dish. You may wish to refer to the Triple Beam Balance Equilibration procedure, the Triple Beam Balance Use and Operation procedure, and the Measuring Mass Using a Weigh Dish or Beaker procedure.

e. Each solid should be measured then added to 100 ml of water. Do this one beaker at a time.

f. Each solution should be stirred, using a glass stir rod, for approximately one minute.

g. After stirring, observe the contents of the beaker and determine whether the compound was soluble in water.

h. Record your conclusions in Table A.

2. Review the chemical formula and elemental composition of each liquid compound:

a. Locate the formulas in Table B.

b. Make a prediction: Which liquids do you think will be able to mix (miscible) in water?

c. Record: Write your predictions in Table B.

3. Test your predictions:

a. Obtain a small sample of each compound from the distribution center.

b. Add 100 ml of water to three 400 ml beakers.

c. Using the plastic eye dropper add one drop of red food coloring to each of the 3 400ml beakers.

d. Use tape and a marker to label in each beaker.

e. Add 10 ml of each liquid sample to 100 ml of water in each beaker. Do this one beaker at a time.

f. Each solution should be stirred, using a glass stir rod, for approximately one minute.

g. After stirring, observe the contents of the beaker and determine whether the compound was miscible in water.

h. Record your conclusions in Table B.

CLEAN UP

Help your group return materials and clean the lab bench after you are finished with the experiment.