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Gravimetric Methods of Chemical Analysis

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Gravimetric Methods of Chemical Analysis

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Questions and Answers

What type of particles are generally desirable in gravimetric work?

Particles that do not settle from solution

Particles with diameters less than 10^-4 cm

Particles that settle spontaneously

Large particles that are easy to filter (correct)

What process involves a minimum number of atoms, ions, or molecules joining together to produce a stable solid?

Digestion

Coagulation

Nucleation (correct)

Adsorption

What is the characteristic size of particles in a colloid?

Diameters greater than 10^-4 cm

Diameters exactly 10^-4 cm

Diameters less than 10^-4 cm (correct)

Diameters that vary

How can the particle size of crystalline solids be improved significantly?

Elevating the temperature and minimizing Q, maximizing S, or both Signup and view all the answers

What process involves a substance being held on the surface of a solid?

Adsorption Signup and view all the answers

How can coagulation of a colloidal suspension be achieved effectively?

Heating with stirring Signup and view all the answers

What is the main principle behind gravimetric methods of analysis?

Measurement of mass Signup and view all the answers

Which statement best describes precipitation methods in gravimetric analysis?

The precipitate is weighed after suitable heat treatment. Signup and view all the answers

What is the purpose of volatilization methods in gravimetric analysis?

To volatilize the analyte at a suitable temperature Signup and view all the answers

What are the characteristics of an ideal precipitating reagent?

Low solubility, easily filtrated, and unreactive with atmosphere Signup and view all the answers

Why is it important for a precipitating reagent to be unreactive with constituents of the atmosphere?

To avoid sample contamination during analysis Signup and view all the answers

What happens to the volatile product in volatilization methods in gravimetric analysis?

It is collected and weighed Signup and view all the answers