The steps in the analysis for Ni^2+ in the complex are listed below but not in t

Question

The steps in the analysis for Ni^2+ in the complex are listed below but not in the correct order. Arrange them in the correct order by placing a number from 1 to 10 in the blank to the left of the step. _____ divide by the slope _____ divide by mass of weighed sample _____ divide by the atomic weight of nickel _____ determine slope of B-L plot _____ dissolve accurately weighed mass of compound in known volume of acid _____ prepare Ni^2+ standard solutions _____ correct for the volume of the acid solution _____ measure absorbance of the acid solution _____ read the procedure _____ determine absorbance of Ni^2+ standards

Explanation / Answer

y = absorbance (A) and it has no unit

x = concentration (C) and has unit of M or mol/L

m = (m) = slope or the molar extinction coefficient in B-L law and has unit of M1 cm1

A = mC +b

Then C = (A-b)/m

8. Correct for volume of the acid solution: This step helps in determining the number of moles of unknown Ni2+ and is calculated using the formula: number of moles of the Ni2+ (n) = concentration of Ni2+ from the plot X Volume of the solution.

9. Divide by atomic weight of Ni: This step is used to determine the mass of unknown Ni. The mass of Ni = number of moles of Ni2+ X Atomic mass of Ni. Please note that Atomic mass of Ni and Ni2+ will be nearly same.

10. Divide by the mass of weighed sample: This will give % yield of the reaction.

% yield = (measured mass) 100 / actual mass

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