If I want to make 1500. mL of a 1.25 M solution, how many moles of drink mix do I need to add? Show your work! 

If I add another 400. mL of water to the solution I made in #3, what will the molarity of the solution be? Show your work!

Part 2: Choose 2 different solutes and try make the following solutions.

Solute 1: Cobalt (II) nitrate

Solute Amount

Solution Volume

Predicted Molarity (Calculate! Show Work!)

Molarity from Sim

Color of Solution

0.225 mol

0.500 L

0.500 M

Really light red

0.370 mol

0.400 L

0.875 M

light red

0. 630 mol

0.300 L

2.00 M

dark/light red

0.775 mol

0.250 L

3.00 M

Darkish red

1.000 mol

0.200 L

5.00 M

Dark red

Solute 2: Gold (II) chloride

Solute Amount

Solution Volume

Predicted Molarity (Calculate! Show Work!)

Molarity from Sim

Color of Solution

0.225 mol

0.500 L

0.450 M

lightish gold

0.370 mol

0.400 L

0.928 M

Dark/Light gold

0. 630 mol

0.300 L

2.107 M

Dark gold

0.775 mol

0.250 L

2.250 M

Saturated

1.000 mol

0.200 L

2.250 M 

Saturated

Questions:

Some of the predicted molarities did not match the molarity in the simulation – why not? What happened as you added more solute but lowered the solution volume? Why is it not possible to make some of these more concentrated solutions?