Part E: Dilutions The dilution equation is often shown with the molarity concent

Question

Part E: Dilutions The dilution equation is often shown with the molarity concentration unit. However, any concentration unit can be used in this dilution equation. This equation mathemat- ically shows that the amount of solute taken from the concentrated, stock solution is equal to the amount of solute transferred into the new, diluted solution. 19. What is the CuCl2 concentration of the new, diluted solution that is prepared by diluting 10.0 mL of a 2.0 M solution of CuCl2 to a new volume of 1000.0 mL? (This is referred to as a 1/100 dilution of the 2.0 M solution; 10.0 mL / 1 000.0 mL 1 /100.) What is the concentration of the new, diluted HNO, solution that is prepared by a 1/50 dilution of 3.0 M HNO, solution? 20. Copyright © 2015 Pearson Education, Inc.

Explanation / Answer

19)

use dilution formula

M1*V1 = M2*V2

Here:

M1 is molarity of solution before dilution

M2 is molarity of solution after dilution

V1 is volume of solution before dilution

V2 is volume of solution after dilution

we have:

M1 = 2.0 M

V1 = 10.0 mL

V2 = 1000.0 mL

we have below equation to be used:

M1*V1 = M2*V2

M2 = (M1*V1)/V2

M2 = (2*10)/1000

M2 = 0.020 M

Answer: 0.020 M

20)

new concentration = old concentration * dilution factor

= 3.0 M * 1/50

= 0.060 M

Answer: 0.060 M

Feel free to comment below if you have any doubts or if this answer do not work

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