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Gravimetric Analysis Procedures

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Questions and Answers

Why is the disodium salt of EDTA usually used in the titration method?

It is available in higher purity (correct)
It forms stronger complexes with multivalent ions
It is more stable than the calcium salt
It is more soluble in water

What is the purpose of measuring the absorbance of the colored complex at 420 nm?

To identify the type of colored complex formed
To calibrate the solution for quantification
To determine the concentration of phosphorous in the sample (correct)
To determine the concentration of other minerals in the sample

What is the purpose of making the solution alkaline (pH 12.5 to 13) in the titration method?

To ensure the indicator can form a colored complex with EDTA
To ensure the EDTA forms strong complexes with the mineral ions (correct)
To prevent interference from other ions in the solution
To dissolve the ashed food sample

How is the calcium content of a food sample determined using the titration method?

By comparing the volume of EDTA required to the end-point with a calibration curve (D) Signup and view all the answers

What is the purpose of adding an indicator that can form a colored complex with EDTA in the titration method?

To identify the end-point of the titration reaction (C) Signup and view all the answers

What is the main limitation of gravimetric analysis for determining trace elements?

Balances are not sensitive enough to accurately weigh small amounts of precipitate (D) Signup and view all the answers

What is the key principle behind gravimetric analysis?

Precipitating the element of interest from solution and then measuring the mass of the precipitate (B) Signup and view all the answers

What is the advantage of colorimetric methods compared to gravimetric analysis?

Colorimetric methods can analyze a wider variety of minerals (D) Signup and view all the answers

What is the purpose of rinsing the precipitate in gravimetric analysis?

To remove any impurities that may have co-precipitated (C) Signup and view all the answers

What is the role of the chemical formula in gravimetric analysis?

It is used to determine the mass of the mineral present in the original sample based on the mass of the precipitate (C) Signup and view all the answers