10 Questions
Why is the disodium salt of EDTA usually used in the titration method?
It is available in higher purity
What is the purpose of measuring the absorbance of the colored complex at 420 nm?
To determine the concentration of phosphorous in the sample
What is the purpose of making the solution alkaline (pH 12.5 to 13) in the titration method?
To ensure the EDTA forms strong complexes with the mineral ions
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
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
What is the main limitation of gravimetric analysis for determining trace elements?
Balances are not sensitive enough to accurately weigh small amounts of precipitate
What is the key principle behind gravimetric analysis?
Precipitating the element of interest from solution and then measuring the mass of the precipitate
What is the advantage of colorimetric methods compared to gravimetric analysis?
Colorimetric methods can analyze a wider variety of minerals
What is the purpose of rinsing the precipitate in gravimetric analysis?
To remove any impurities that may have co-precipitated
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
Learn about the method and procedures of gravimetric analysis, which involves precipitating elements from a solution to determine their concentration. Understand the limitations of gravimetric procedures in analyzing trace elements due to sensitivity issues with balances.
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