Honors Chemistry Module 9 Lesson 1:
In this module, you use your Science Journal that includes your practice activities. Each practice
activity will indicate what you will add to the journal. When you complete all practice activities
in Module 9, submit the journal to your teacher for a grade.
This practice activity will take you to an external site to complete the activity. You will complete
the activity and respond to the questions and store in your Science Journal.
Directions:
Go to the following link either by clicking on it or by copying and pasting it into the address bar.
http://phet.colorado.edu/en/simulation/soluble-salts
1. Shake some salt out and note the ratio of the sodium to chloride.
a. Write a formula for sodium chloride using the periodic table to find the elements’
symbols.
b. Look in the right hand corner of the screen. Are all of the ions dissolved? If so, what
type of solution is this?
c. Describe the 3 steps of hydration (solvation) that are occurring here.
d. Take a screen shot and post in your Science Journal.
2. Go to the Slightly Soluble Salts tab.
a. Determine the formulas of the following salts: 1) mercury (II) bromide; 2) silver
bromide; and 3) copper (I) iodide.
b. In the right hand corner, choose one of these at a time. For each, shake some salt
out.
c. For each one of the three, after you shake, are all of the ions dissolved? Describe the
solution based on this.
d. Take a screen shot of each of your 3 solutions.
3. Go to the Design A Salt tab.
a. Choose the cation as +3 and the anion as -2.
b. Shake some salt and describe what happens.
c. What type of solution have you created?
d. Give a specific example of this salt.
Once you have completed the exercises above, scroll down to check your answers. Feel
free to contact me with questions.
Answers:
1. a. NaCl
b. It will depend on the number of times that you shake, but because salt is
soluble in water, the answer will probably be “yes”. If you are able to continue
shaking and they are all dissolved, you have created an unsaturated solution. If
you are at the point in which no more will dissolve, then your solution is
saturated.
c. 1. The sodium ions and the chloride ions separate. This requires energy.
2. The water molecules separate from each other (hydrogen bonds are
broken). This requires energy.
3. The positive sodium ions are surrounded by the negative sides of water
molecules and the negative chloride ions are surrounded by the positive sides of
water molecules. This holds all of the sodium chloride in solution.
2. a. 1. HgBr2; 2. AgBr; 3. CuI
c. This answer will vary based on the number of shakes, but because these are
only slightly soluble, most of these will have ions are not dissolved indicating that
you have gone past the saturation point.
3.
c. The answer will depend on the number of shakes, but if all are dissolved, you
have an unsaturated solution. If you go past this and some of the ions are
undissolved, you have gone past the saturation point.
d. Possible examples: Al2O3; Al2S3