 # a measure of the amount of solute that is dissolved in a given quantity of solvent unit of measurement is Molarity (M) which is moles/liter can be dilute.

## Presentation on theme: "a measure of the amount of solute that is dissolved in a given quantity of solvent unit of measurement is Molarity (M) which is moles/liter can be dilute."— Presentation transcript:

a measure of the amount of solute that is dissolved in a given quantity of solvent unit of measurement is Molarity (M) which is moles/liter can be dilute or concentrated

The number of moles of solute dissolved in one liter of solution Molarity = moles solute liters of solution

1.0 L of water was used to make 1.0 L of solution. Notice the water left over. 1.0L of water would be too much.

top off to 1 liter

Step 1: Calculate moles of NiCl 2 6H 2 O in 5 g of NiCl 2 6H 2 O Step 2: Calculate Molarity 1.0 L = 1000 mL.25 L = 250 mL

Step 1: Change mL to L. 250 mL/1000 = 0.250 L Step 2: Calculate. moles = (0.0500 M) (0.250 L) = 0.0125 moles H 2 C 2 O 4 Step 3: Convert moles to grams. (0.0125 mol H 2 C 2 O 4 ) (90.00 g) = 1.13 g 1 mol H 2 C 2 O 4 1 mol H 2 C 2 O 4 M = moles/V  moles = MV What mass of oxalic acid, H 2 C 2 O 4, is required to make 250 mL of a 0.0500 M solution?

How many grams of NaOH are required to prepare 400 mL of 3.0 M NaOH solution? 1)12 g 2)48 g 3) 300 g

diluting a solution reduces the number of moles of solute per unit volume, but the total number of moles of solute in the solution does not change therefore, as Volume increases, Molarity decreases Molarity (M) = moles of solute liters of solution (V) becomes: M 1 V 1 = M 2 V 2

M 1 V 1 = M 2 V 2