# Schools normally purchase concentrated (14 M) nitric acid and then dilute it for use. What volume is required to prepare 2.0 L of 0.15 M acid?

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The general relationship to solve problems like this is to recognize that:

L * M = L* M

this is true because if you multiply M * L you get moles. So what this is saying is that the number of moles is equal before and after.

So for your problem:

you have 14 M HNO3 and need to know the volume.

You want to end up with 2 L of 0.15 M HNO3

Substitute your knowns into the above equation and solve.

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