Catalyst. C alculators 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. Today’s Agenda. DILUTIONS.
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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:
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?
(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
Procedure for Dilutions
1. To dilute a solution, you add more _________ to the existing solution.
2. Diluting a solution makes it have a _______ concentration.
3. How could 0.10L of 1M NaCl solution be made from 2M NaCl solution?