16 Questions
What is the general procedure for the gravimetric method?
Precipitation => Digestion => Filtration => Heating or Ignition => Weighing
What is the role of the chemical agent that causes a solid to form in the precipitation process?
Precipitant
How can large crystals be obtained during precipitation?
By adding the precipitating agent slowly with stirring
What is the purpose of digestion in the gravimetric method?
To allow the precipitate to interact with the mother liquor
What is the gravimetric factor (GF)?
The ratio of determined substance mass to weighed precipitate substance mass
How is the weight of ZY (w.t. ZY) calculated using the gravimetric factor (GF) and the weight of ZM (w.t. ZM)?
$w.t. ZY = w.t. ZM \times (m.wt. ZY / m.wt. ZM)$
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
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
What is the ability of colloid particles to combine with each other and form larger structures called?
Coagulation
Which process is opposite to coagulation, involving breaking up coagulates and returning them to a colloid state?
Peptization
What is the property of colloidal solutions that causes light passing through them to scatter and reflect from the surface?
Tyndall effect
How can coagulation of colloid particles be increased?
Addition of precipitating agents slowly with stirrer
What is the radius range of particles in colloidal solutions?
$10^{-8} – 10^{-6}$ cm
What kind of precipitate is formed when nacl reacts with AgNO3 in excess?
Colloidal ppt.
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
What is the weight of $NaCl$ if 6.2971 g of $AgCl$ was obtained from 2.56823 g of $NaCl$?
23 g
Test your knowledge of the gravimetric method, the oldest analytical technique used to measure mass or a change in mass. Learn about the general procedure involving precipitation, digestion, filtration, and weighing, as well as the role of precipitation in the process.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
