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## Homework Statement

How much 2M HCl do you have to add to 5 liters of 6 M HCl, to obtain a 3.5 M HCl solution?

## The Attempt at a Solution

I initially thought of something like m1v1=m2v2, but that doesn't seem to really work in this case :/?

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- Thread starter shemer77
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How much 2M HCl do you have to add to 5 liters of 6 M HCl, to obtain a 3.5 M HCl solution?

I initially thought of something like m1v1=m2v2, but that doesn't seem to really work in this case :/?

- #2

symbolipoint

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Let V = volume of 2M HCl to add. Final solution volume to make is V+5 liters.

Moles of HCl in final prepared solution are 2*V + 6*5 moles.

Analyze the situation and construct the needed equation and solve.

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