How will you prepare o.o2 molar potassium permangnate(kmno4) solution in100ml?

First you should aquire a 100 mL graduated cylinder or better yet a 100 mL volumetric flask. Let's pretend you want this to a reasonable precision, like 0.0200 M instead of 0.02 M Next we find the number of moles in 100 mL. This you can do in your head, since 100 mL is 1/10 of a liter.

Therefore you need 0.00200 moles of KMnO4. Weigh out 0.00200 mol of KMnO4 which is of course computed from the molar mass of KMnO4, as shown below. 0.00200 mol KMnO4 x 158.0 g KMnO4 / mol KMnO4 = 9.53 g KMnO4.

Dissolve this quantitiy of KMnO4 in about 75 mL of water in a beaker. KMnO4 isn't real soluble, so this will take lots of stirring. Plus it will get dark, so that the undissolved particles are hard to see.

Keep stirring. When it is all dissolved pour the solution into the graduated cylinder or volumetric flask. Rinse the beaker will a little water and add to the cylinder or flask.

When all of the solution is transferred, dilute to the mark. This will be your 0.0200 M solution. More.

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