22 Questions
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.
True
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.
False
Gravimetric analysis requires calibration for all apparatus used.
False
Precipitation gravimetry involves converting the analyte to a highly soluble precipitate.
False
Crystalline suspension particles are easily filtered.
True
Particle size of a precipitate is directly proportional to the relative supersaturation of the solution during the precipitation process.
False
In order to promote particle growth, it is advisable to increase the relative supersaturation ratio.
False
It is recommended to precipitate from a dilute solution for experimental control of particle size.
True
Adding precipitating reagents slowly, without stirring, is an effective way to control particle size.
False
To maintain quantitative precipitation, it is recommended to precipitate at a high pH.
False
In the precipitation method for determining calcium in water, oxalic acid is added to the sample to precipitate calcium carbonate.
False
After the precipitate in gravimetric analysis is filtered, it is washed free of impurities.
True
Particle growth occurs when molecules come together to form a stable solid.
True
If nucleation is faster than particle growth, pure crystals with large particles form.
False
Gravimetric precipitating agents react specifically with the analyte in all cases.
False
Particles of large precipitates are difficult to filter and wash.
False
Colloidal suspensions consist of large particles that are visible to the naked eye.
False
Precipitates made up of fine particles are usually purer than those made up of large particles.
False
The physical nature of precipitates is determined by the rate of particle growth only.
False
Large particles in precipitates are generally harder to filter and wash compared to small particles.
False
Learn about gravimetric methods of analysis, which are quantitative techniques based on determining the mass of a pure compound related to the analyte. Explore an example involving the determination of lead (Pb+2) in water through precipitation reactions and mass calculations. Discover the classifications of gravimetric methods that involve changing the phase of the analyte for separation.
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