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Catalyst

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Calculators today!

1. What is the molarity of a 25L solution with 10 mol of KBr?

2. How many moles did I use if I have a 5M solution of 10L?

3. Which is the solute and which is the solvent?: salt dissolved in the ocean.

Remember, concentration is how “strong” a solution is. It is the amount of solute in a certain amount of solvent.

If I accidentally made my coffee too strong this morning, how would I make it less strong? (If I want it to go from high concentration to low concentration…)

DILUTE IT! (Usually with water)

You dilute a solution whenever you add solvent to a solution. Adding solvent results in a solution of lower concentration. You can calculate the concentration of a solution following a dilution by applying this equation:

M1V1=M2V2

M is molarity, V is Volume

If V1 is in mL, V2 must be in mL. If V1 is in L, V2 must be in L.

How could 1L of 1M HCl solution be made from 10M of HCl solution?

(1L)(1M) = (10M)(V2)

1 = (10) (V2)

1/10 = 0.1 L = V2

So, you would take 0.1 of the 10M solution and then add enough water to make 1 L. This would give you a 1M HCl solution.

How could 0.5L of 2M NaOH solution be made from 6M NaOH solution?

- If I add 30 mL of water to 150 mL of a 2.5 M HCl solution, what will the molarity of the diluted solution be?

- To dilute, just add water!
(Or other solvent)

How could 2.5L of .5M NaOH solution be made from 5M NaOH solution?

How could 1L of 2M H2SO4 solution be made from 10M H2SO4 solution?

How could .25L of 1M NaCl solution be made from 5M NaCl solution?

Procedure for Making Kool-Aid

- Using the formula we learned in class M= mol/L, determine the amount of moles you would need to make 150 mL of a 3M solution of Kool-Aid.
- Use the moles to grams chart on the right to determine how many grams you will need for the 3 M solution.
- Measure out the correct amount of Kool-Aid powder and pour the powder in a cup. Then fill the cup with 150 mL of water.
Procedure for Dilutions

- We have a Kool-aid solution that has a concentration of 3M. We want to know how we can dilute it to make 50mL of a 0.5M solution.
- Write the procedure you will follow to dilute your solutions.

1. To dilute a solution, you add more _________ to the existing solution.

a. solvent

b. solute

2. Diluting a solution makes it have a _______ concentration.

a. higher

b. lower

3. How could 0.10L of 1M NaCl solution be made from 2M NaCl solution?