Answer :
The amount of a solution that is 2 * 10^-1 M in copper ions required to make a 50mL of a solution that is 2 * 10^-2 M is 5mL (based on titration formula).
What is titration?
Titration, also known as titrimetry, is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte. Since volume measurements play a key role in titration, it is also known as volumetric analysis.
How to calculate the volume of a solution?
From the titration formula
Base = Acid
M1 * V1 = M2 * V2
Where given from the question
M1 (Molarity of first solution) = 2 * 10^-1 M
V1 (Volume of first solution) = unknown
M2 (Molarity of second solution) = 2 * 10^-2 M
V2 (Volume of second solution) = 50mL
Now, let's use the formula
(2 * 10^-1) * V1 = 2 * 10^-2 * 50
V1 = 5mL
Therefore, the volume of the first solution with 2*10^-1 M in copper ions required is 5mL.
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