Answer :
3ml will contain 0.4 ml of coloring solution.
The given formula calls for 0.4 mL of a coloring solution
5-mL graduate calibrated from 1 to 5 mL in 1-mL units
Now,
We want to use an aliquot technique to measure 0.4 ml of coloring solution.
As the calibrated graduate is used to measure 1ml to 5ml with 1ml as a unit measure
let us add 2.6 mL of water in 0.4 ml of coloring solution
total volume of solution = 2.4 + 0.6 = 3 mL
therefore,
0.4 mL of coloring solution now includes = 2.6ml of water
or
1 mL of coloring solution includes = 4mL of water
Hence measure 3 mL of coloring solution with water that is formed
Therefore, this 3 mL will contain 0.4 mL of coloring solution.
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