30 Questions
What is the main purpose of gravimetric analysis?
Calculating the mass or concentration of a substance
In gravimetric analysis, the chemical being quantified is known as ____________.
Analyte
What does an analyte represent in an analytical procedure?
A substance or chemical constituent of curiosity
Why are gravimetric analyses considered accurate for determining particulate mass concentration?
They compare masses of two compounds containing the analyte
Which step immediately follows the separation of the desired ion/element/radical in gravimetric analysis?
Formation of a natural insoluble compound
What is one advantage of gravimetric analysis over other methods of analysis?
High accuracy in determining mass concentration
What is the primary technique used in Volatilization Gravimetry?
Heating the sample
In Thermogravimetric analysis, what is measured as a function of increasing temperature?
Changes in physical and chemical properties
What is the main objective of Precipitation Gravimetry?
To split one or more parts of a solution by precipitation
Which gravimetric analysis technique involves chemically decomposing a sample to convert it into a gas for weighing?
Volatilization Gravimetry
How is moisture content determined using Volatilization Gravimetry?
By heating the sample
What is a common application of Precipitation Gravimetry in determining anionic species?
Indirect determination of PO43- by precipitating Hg2Cl2
What is the main principle behind gravimetric analysis?
Estimation of mass percent of an ion in an impure compound
What is the purpose of precipitation gravimetry in gravimetric analysis?
To convert the analyte into an insoluble form
Why does gravimetric analysis not require a series of standards for calculation of an unknown?
Because it is based only on atomic or molecular weights
What happens to the separated precipitate in gravimetric analysis after being induced?
It is dried or ignited, possibly to another form
Which step is common in the process of gravimetric analysis?
Heating compounds to chemically decompose them
In gravimetric analysis, what is measured to determine the mass of the pure compound?
The mass of the separated precipitate
What is the purpose of using a Buchner’s funnel in gravimetric analysis?
To filter the solution under vacuum
Why is it recommended to carry out more than one washing of the beaker in gravimetric analysis?
To ensure no residue is left on the walls of the beaker
Which statement describes an advantage of using the gravimetric method in chemical analysis?
It involves direct measurement without calibration
What can be done with the gravimetric analysis data after weighing the dried product?
Determine the mass of the ion formed
Why is it important to dry the product completely in gravimetric analysis?
To avoid inaccuracies in weighing
What are the most expensive items required for gravimetric analysis?
Platinum crucibles and muffle furnace
What is the primary goal of electrogravimetry in environmental engineering analysis?
To quantify ions of a substance by deposition on an electrode
Which method involves the electrochemical reduction of metal ions at a cathode and simultaneous deposition of the ions on the cathode?
Electrogravimetry
What type of analytes are commonly determined using particulate gravimetry in environmental engineering?
Suspended solids and oil and grease
During electrogravimetry, what corresponds to the mass of analyte initially present in the sample?
The weight difference of the cathode before and after electrolysis
Which process involves separating matter in environmental samples based on volatility and particle size?
Particulate gravimetry
What is an example given in the text that illustrates electrogravimetry?
Deposition as PbO2 at a Pt anode
Learn about the different types of gravimetric analysis techniques used in chemistry, including the process of volatilization gravimetry. Explore how analytes are separated from mixtures through various methods resulting in a change in mass.
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