Select the container (1, 2, or 3) that represents the dilution of a solution to give each of the following: (9.5)
a. a 2% (m/v) KCl solution

Question

Select the container (1, 2, or 3) that represents the dilution of a solution to give each of the following: (9.5)

a. a 2% (m/v) KCl solution

Accepted Answer

Hello. In this problem, we are told the illustration below represents an 8% by mass volume lithium fluoride solution. We are asked to determine which of the following illustrates the dilution of the above solution to a 4% by mass volume lithium fluoride solution. We are provided with four possible answers. ABC and D answer C has the largest volume followed by answer A then answer D and finally answer B has the smallest volume as the volume increases. We see the shading get lighter in color. That's because the solution is becoming more dilute. We can make use of the dilution equation. So we have C one times V one. So our initial concentration times our initial volume is equal to C two times V two. So our final concentration times our final volume. We're trying to find our final volume V two. So we'll divide both sides by our final concentration. You then get our initial concentration times our initial volume divided by our final concentration. Our initial concentration was an 8% by mass volume times our initial volume of V one. And our final concentration was a 4% by mass volume are 8% divided by 4% will give us two. So we have, then that V two is equal to two times V one. So we are looking for the illustration then that shows that we have twice the volume of our initial situation. And so we see that corresponds then with answer A. So answer A is the correct answer. Thanks for watching. Hope this helped.

Select the container (1, 2, or 3) that represents the dilution of a solution to give each of the following: (9.5)
a. a 2% (m/v) KCl solution
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Key Concepts

Dilution

Mass/Volume Percentage (m/v)

Concentration Calculation