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V1*c1=V2*c2 so:

V1 = 10.0(mL) * 0.160 (M) / 0.400 (M) = 4.00 mL

Add about 6 mL water up to the end volume of 10.0 mL

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12y ago
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10y ago

This is a simple case of applying a dilution factor. Your dilution factor is 7/3. i.e. you have a concentration that is 3/7 of what it was (i.e. 300/(300+400)). 0.6/7*3 is 0.25714M.

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11y ago

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Q: How many mL of a 0.400 M concentrated solution must be added to water to get a more dilute solution with a total volume of 10.0 mL and a new concentration of 0.160 M?
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