Question

Calculate the final concentration of the solution when water is added to prepare each of the following solutions.60.0 mL of a 20.8 M HCl solution is diluted to 600. mL

Answer 1

Step 1

When H2O is added to a solution, it gets diluted.

Mathematically:

$M1\text{ x V1 = M2 x V2}$

M1 = concentration 1 of the solution

V1 = volume 1 of the solution

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M2 = new concentration of the solution

V2 = new volume of the solution

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Step 2

Information provided:

M1 = 20.8 M HCl

V1 = 60.0 mL

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M2 = unknown

V2 = 600. mL

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Step 3

From step 1, M2 is found as follows:

M1 x V1/V2 = M2

(20.8 M x 60.0 mL)/600. mL = M2

2.08 M = M2

Answer: M2 = concentration 2 = 2.08 M