Podcast
Questions and Answers
Gravimetric methods of analysis are qualitative methods.
Gravimetric methods of analysis are qualitative methods.
False
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
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
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.
Signup and view all the answers
Gravimetric analysis requires calibration for all apparatus used.
Gravimetric analysis requires calibration for all apparatus used.
Signup and view all the answers
Precipitation gravimetry involves converting the analyte to a highly soluble precipitate.
Precipitation gravimetry involves converting the analyte to a highly soluble precipitate.
Signup and view all the answers
Crystalline suspension particles are easily filtered.
Crystalline suspension particles are easily filtered.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
Particle growth occurs when molecules come together to form a stable solid.
Particle growth occurs when molecules come together to form a stable solid.
Signup and view all the answers
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.
Signup and view all the answers
Gravimetric precipitating agents react specifically with the analyte in all cases.
Gravimetric precipitating agents react specifically with the analyte in all cases.
Signup and view all the answers
Particles of large precipitates are difficult to filter and wash.
Particles of large precipitates are difficult to filter and wash.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
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.
Signup and view all the answers
