Podcast
Questions and Answers
Gravimetric methods of analysis are qualitative methods.
Gravimetric methods of analysis are qualitative methods.
False (B)
In the determination of lead (Pb+2) in water, PbCl2 is used to calculate the amount of Pb+2 in the original solution.
In the determination of lead (Pb+2) in water, PbCl2 is used to calculate the amount of Pb+2 in the original solution.
True (A)
Volatilization method involves separating the analyte by converting it into a liquid form.
Volatilization method involves separating the analyte by converting it into a liquid form.
False (B)
Electro-analytical method separates the analyte by deposition on an electrode using a magnetic field.
Electro-analytical method separates the analyte by deposition on an electrode using a magnetic field.
Gravimetric analysis requires calibration for all apparatus used.
Gravimetric analysis requires calibration for all apparatus used.
Precipitation gravimetry involves converting the analyte to a highly soluble precipitate.
Precipitation gravimetry involves converting the analyte to a highly soluble precipitate.
Crystalline suspension particles are easily filtered.
Crystalline suspension particles are easily filtered.
Particle size of a precipitate is directly proportional to the relative supersaturation of the solution during the precipitation process.
Particle size of a precipitate is directly proportional to the relative supersaturation of the solution during the precipitation process.
In order to promote particle growth, it is advisable to increase the relative supersaturation ratio.
In order to promote particle growth, it is advisable to increase the relative supersaturation ratio.
It is recommended to precipitate from a dilute solution for experimental control of particle size.
It is recommended to precipitate from a dilute solution for experimental control of particle size.
Adding precipitating reagents slowly, without stirring, is an effective way to control particle size.
Adding precipitating reagents slowly, without stirring, is an effective way to control particle size.
To maintain quantitative precipitation, it is recommended to precipitate at a high pH.
To maintain quantitative precipitation, it is recommended to precipitate at a high pH.
In the precipitation method for determining calcium in water, oxalic acid is added to the sample to precipitate calcium carbonate.
In the precipitation method for determining calcium in water, oxalic acid is added to the sample to precipitate calcium carbonate.
After the precipitate in gravimetric analysis is filtered, it is washed free of impurities.
After the precipitate in gravimetric analysis is filtered, it is washed free of impurities.
Particle growth occurs when molecules come together to form a stable solid.
Particle growth occurs when molecules come together to form a stable solid.
If nucleation is faster than particle growth, pure crystals with large particles form.
If nucleation is faster than particle growth, pure crystals with large particles form.
Gravimetric precipitating agents react specifically with the analyte in all cases.
Gravimetric precipitating agents react specifically with the analyte in all cases.
Particles of large precipitates are difficult to filter and wash.
Particles of large precipitates are difficult to filter and wash.
Colloidal suspensions consist of large particles that are visible to the naked eye.
Colloidal suspensions consist of large particles that are visible to the naked eye.
Precipitates made up of fine particles are usually purer than those made up of large particles.
Precipitates made up of fine particles are usually purer than those made up of large particles.
The physical nature of precipitates is determined by the rate of particle growth only.
The physical nature of precipitates is determined by the rate of particle growth only.
Large particles in precipitates are generally harder to filter and wash compared to small particles.
Large particles in precipitates are generally harder to filter and wash compared to small particles.
