Calculate the concentration of a solution prepared by adding 15.00 mL of 2.00 × 10 − 3 M K M n O 4 from a buret into a 50.00 mL volumetric flask, which is then filled to the 50.00 mL graduation mark with distilled water.

The concentration of the solution is 6 mol/dm3.

Explanation:

We have the relationship between concentration and volume to be:

  where c1v1 and c2v2 are initial and final concentrations and volumes respectively.

NOTE: (volume should be in litres if concentration is in Molar, M. But seeing as you have 2 × 10-3, I assume you have converted from mL to L already.)

15mL × 0.002mol/dm3 = 50mL × mol/dm3

∴ =

= 0.0006 ≅ 6 ×mol/dm3

the correct answer is:

a. formation of precipitation

it is the most commonly accepted one