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Postby camrynpatterson3C » Fri Oct 06, 2017 9:48 am

To find the concentration of NH4NO3 first, do we use just 1 liter or 4, since 3 was added?

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Postby vicenteruelos3 » Fri Oct 06, 2017 10:22 am

to find the concentration after the dilution you use (M initial)(volume initial) = (molarity final)(volume final)
(.2 x 1)/(4) = final molarity

that equals .05M
you use 4 because its final volume in the equation

Zane Mills 1E
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Re: G13

Postby Zane Mills 1E » Sat Oct 07, 2017 10:32 am

Correct ^ you always use the total amount of liquid in the calculation, as to have an accurate representation of the molarity of the soln and the concentration of solutes. If you were to use 1 that would not be representative of the actual M1V1, thus producing an inaccurate answer. The final volume is quite often what you will be calculating, so this is very important to remember.

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