Answer to Question #195002 in General Chemistry for atira

Question #195002

A teacher needs to make 120.0 mL of a 4.00 M HCl solution using a stock solution with a concentration of 12.0 M. Determine the volume of 12.0 M HCl needed to make the dilution.


1
Expert's answer
2021-05-19T02:26:32-0400

c1 = 12.0 M

V1 = unknown

c2 = 4.00 M

V2 = 120.0 mL


Solution:

The equation for dilution calculations can be used.



where:

c1, V1 - the molarity and volume of the concentrated solution

c2, V2 - the molarity and volume of the diluted solution


Thus:

(12.0 M) × V1 = (4.00 M) × (120.0 mL)

V1 = (4.00 M × 120.0 mL) / (12.0 M) = 40 mL

V1 = 40 mL


Answer: 40 mL of 12.0 M HCl needed to make the dilution.

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