Question

Q1)

A 10.0 mL solution containing 0.15 g/L of Blue #2 dye is diluted to a total volume of 100.0 mL. What is the concentration of the diluted solution (in g/L)?

Q2)

A 10.0 mL solution containing 0.044 M of Blue #2 dye is diluted to a total volume of 100.0 mL. What is the concentration of the diluted solution (in M)?

Answer #1

1)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 0.15 g/L

V1 = 10 mL

V2 = 100 mL

use:

M1*V1 = M2*V2

M2 = (M1*V1)/V2

M2 = (0.15*10)/100

M2 = 0.015 g/L

Answer: 0.015 g/L

2)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 0.044 M

V1 = 10 mL

V2 = 100 mL

use:

M1*V1 = M2*V2

M2 = (M1*V1)/V2

M2 = (0.044*10)/100

M2 = 0.0044 M

Answer: 0.0044 M

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