Strengths of Acids and Bases Making Dilutions

Page
2

New molarity = 0.15 moles = 1.5 M

0.100 L

Slide 11

Learning Check SW 2

A 125 mL sample of a 3.0 M HCl is diluted by adding 250 mL of water. The new concentration of the HCl solution is

1) 8.0 M

2) 1.5 M

3) 1.0 M

Slide 12

Solution SW 2

3) 1.0 M

moles HCl = 0.250 L x 3.0 moles = 0.75 mole

1 L

new M = 0.75 mole 1.0 M HCl

0.750 L

(new volume)

Slide 13

Learning Check SW 3

A 50.0 mL sample of 15% sucrose solution is diluted by adding 200. mL of water. The new concentration of the sucrose solution is

1) 3.0 %

2) 7.5 %

3) 10. %

Slide 14

Learning Check SW 3

A 50.0 mL sample of 15% sucrose solution is diluted by adding 200. mL of water. The new concentration of the sucrose solution is

1) 3.0 %

g sucrose = 50.0 mL x 15 g sucrose = 7.5 g

100 mL

new % = 7.5 g sucrose = 3.0 % sucrose

250 mL

(new volume)