[hmv]

I'm not quite sure as to how to solve the following exercise; please help me.
A chemist must dilute  19.3 ml of 4.81 M aqueous potassium iodide (KI) solution until the concentration falls to 2.00 M. He'll do this by adding distilled water to the solution until it reaches a certain final volume.
Calculate this final volume, in milliliters.

[cliverlong]

How else (in what other units) can you write a concentration of 1M ?

How else (in what other units) can you write a concentration of 4.81M ?

How many moles of KI are in 19.3 ml of 4.81 M aqueous potassium iodide (KI) solution?

Clive

[hmv]

Do i have to get the molar concentration to grams?

[sjb]

Well, you don't *have* to, as it will cancel back out in the end. But, if it makes it easier for you, do so.

[Ida Isotope]

Use C1V1 = C2V2.

[cliverlong]

Use C1V1 = C2V2.

I suggest the original poster is wary of applying pat formulae "straight" without regard to the units given in the question. Otherwise there is the risk the answer may be several orders of magnitude incorrect.

Clive