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Anestetic [448]
3 years ago
8

Can someone pls help me with number 8? Thanks ~

Biology
1 answer:
DaniilM [7]3 years ago
6 0

So we can use the equation: M_{1}V_{1}=M_{2}V_{2}

where M is the concentration and V is the volume in liters.

We can then solve for how much of the stock solution we are going to put into the new solution:

(5M)(V_{2})=(1.5M)(0.5L)

Then we can solve for V_{2}:

V_{2}=\frac{(1.5M)(0.5L)}{5M}=0.15L

So now we know that we need to use 150 mL of the stock solution in the new solution - and we know that the total volume of the new solution is 500 mL. So therefore the rest of the new solution should be water:

500-150=350

So the rest of the solution (350 mL) is water.


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