Chemistry homework

Question

If you dilute 175 mL of a 1.6 M solution of LiCl(aq) to 1.0 L, determine the new concentration of the solution?

Answer 1

V1M1 = V2M2 (be sure all units match)

(175 ml)(1.6 M) = (1000 ml)(x M)

x = 0.28 M

Answer 2

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Step 1. Rearrange M1V1 = M2V2

You are looking for the "new" concentration, which means M2.

Divide each side by V2 and get: M2= (M1V1)/V2

Step 2. Plug it in, be wary of the correct units

M2 = (0.175 L * 1.6 M)/ 1.0 L = 0.28 M

I prefer to keep it in L since we would divide by 1 L.