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8. A diluted solution of Red Dye #40 is 6.5x10^-3 M. If the solution resulted by...

8. A diluted solution of Red Dye #40 is 6.5x10^-3 M. If the solution resulted by diluting 5.00 mL of Red Dye #20 to 500.0 mL, what was the oringinal solution concentration?

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Answer #1

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:

M2 = 6.5*10^-3 = 0.0065 M

V1 = 5.0 mL

V2 = 500.0 mL

we have below equation to be used:

M1*V1 = M2*V2

M1 = (M2 * V2) / V1

M1 = (0.0065*500)/5

M1 = 0.65 M

Answer: 0.65 M

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