Question

Calculate the volume of water needed to dilute 20 mL of soil (1.35 g / cm3) to a concentration of 20%.

Answer 1

ANSWER

When performing a dilution you can use the relationship:

M

1

V

1

=M

2

V

2

Where:

M

1

= Molarity of the original solution

V

1

= Volume of the original solution

M

2

= Molarity of the final solution

V

2

= Volume of the final solution

Substituting:

50×3=1×V

2

V

2

=150ml.

This is the final Volume.

Therefore, you need 100 ml of water to make a final volume of 150 because 50 ml comes from the Original Volume of 3M HCl.