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16 Questions

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Gravimetric Method Quiz

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Questions and Answers

What is the general procedure for the gravimetric method?

Digestion => Filtration => Precipitation => Heating or Ignition => Weighing

Heating or Ignition => Precipitation => Digestion => Filtration => Weighing

Filtration => Precipitation => Digestion => Heating or Ignition => Weighing

Precipitation => Digestion => Filtration => Heating or Ignition => Weighing (correct)

What is the role of the chemical agent that causes a solid to form in the precipitation process?

Catalyst

Diluent

Precipitant (correct)

Solvent

How can large crystals be obtained during precipitation?

By using a concentrated solution

By adding the precipitating agent slowly with stirring (correct)

By adding an acidic solution

By increasing the pH value

What is the purpose of digestion in the gravimetric method?

To allow the precipitate to interact with the mother liquor Signup and view all the answers

What is the gravimetric factor (GF)?

The ratio of determined substance mass to weighed precipitate substance mass Signup and view all the answers

How is the weight of ZY (w.t. ZY) calculated using the gravimetric factor (GF) and the weight of ZM (w.t. ZM)?

$w.t. ZY = w.t. ZM \times (m.wt. ZY / m.wt. ZM)$ Signup and view all the answers

In the given chemical analysis, what is the percentage of NaBr and KBr mixture if Ag% is found to be 80%?

30% NaBr, 50% KBr Signup and view all the answers

What is the weight of NaCl in a sample if 2 g of silver chloride was precipitated from a 1.5 g sample containing sodium chloride?

0.815 g Signup and view all the answers

What is the ability of colloid particles to combine with each other and form larger structures called?

Coagulation Signup and view all the answers

Which process is opposite to coagulation, involving breaking up coagulates and returning them to a colloid state?

Peptization Signup and view all the answers

What is the property of colloidal solutions that causes light passing through them to scatter and reflect from the surface?

Tyndall effect Signup and view all the answers

How can coagulation of colloid particles be increased?

Addition of precipitating agents slowly with stirrer Signup and view all the answers

What is the radius range of particles in colloidal solutions?

$10^{-8} – 10^{-6}$ cm Signup and view all the answers

What kind of precipitate is formed when nacl reacts with AgNO3 in excess?

Colloidal ppt. Signup and view all the answers

What is the weight of $BaCl_2•2H_2O$ required to precipitate $BaSO_4$ from 10 g of $Na_2SO_4•10H_2O$?

7.58 g Signup and view all the answers

What is the weight of $NaCl$ if 6.2971 g of $AgCl$ was obtained from 2.56823 g of $NaCl$?

23 g Signup and view all the answers