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Questions and Answers
In volumetric analysis, what is being measured to determine the amount of a substance?
In volumetric analysis, what is being measured to determine the amount of a substance?
- The temperature change during a reaction involving the substance.
- The color change of the substance in reaction.
- The mass of the substance directly.
- The volume that the substance occupies. (correct)
What is the key principle behind Dumas' method for determining nitrogen content in organic compounds?
What is the key principle behind Dumas' method for determining nitrogen content in organic compounds?
- Using a spectrophotometer to measure nitrogen concentration.
- Measuring the pH change of the solution after combustion.
- Converting all nitrogen to elemental nitrogen gas and measuring its volume. (correct)
- Converting all nitrogen to ammonia and titrating it.
Which gas is used to carry the nitrogen from the furnace in Dumas' method?
Which gas is used to carry the nitrogen from the furnace in Dumas' method?
- Carbon dioxide (correct)
- Nitrous oxide
- Oxygen
- Hydrogen
In the context of volumetric analysis, what is the purpose of using a strong alkali solution in Dumas' method?
In the context of volumetric analysis, what is the purpose of using a strong alkali solution in Dumas' method?
How is the mass of nitrogen determined after its volume is measured in Dumas' method?
How is the mass of nitrogen determined after its volume is measured in Dumas' method?
What gaseous product is formed when nitrates are analyzed using a volumetric method?
What gaseous product is formed when nitrates are analyzed using a volumetric method?
Why is volumetric analysis used in biological processes?
Why is volumetric analysis used in biological processes?
In the context of fuel gas analysis, what principle does volumetric analysis rely on?
In the context of fuel gas analysis, what principle does volumetric analysis rely on?
Which of the following is NOT a component typically analyzed in fuel gases and combustion products using volumetric methods?
Which of the following is NOT a component typically analyzed in fuel gases and combustion products using volumetric methods?
How does titrimetric analysis relate to volumetric analysis?
How does titrimetric analysis relate to volumetric analysis?
Flashcards
Volumetric Analysis
Volumetric Analysis
Quantitative chemical analysis using volume to determine substance amount.
Titrimetric Analysis
Titrimetric Analysis
A more precise term for volumetric analysis, involving titration.
Dumas' Method
Dumas' Method
Determining nitrogen proportion in organic compounds by converting it to N2 gas and measuring its volume.
Volumetric Nitrate Analysis
Volumetric Nitrate Analysis
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Volumetric Measurement in Biology
Volumetric Measurement in Biology
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Fuel Gas Analysis
Fuel Gas Analysis
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Study Notes
- Volumetric analysis is a quantitative chemical analysis method.
- It determines the amount of a substance.
- This is done by measuring the volume it occupies.
- It can also be done by measuring the volume of a second substance that combines with the first in known proportions.
- The latter is more correctly called titrimetric analysis or titration.
- Jean-Baptiste-André Dumas, a French chemist, devised a procedure for determining the proportion of nitrogen combined with other elements in organic compounds.
- A weighed sample of the compound is burned in a furnace to convert all the nitrogen to elemental nitrogen gas (N2).
- The nitrogen is carried from the furnace in a stream of carbon dioxide.
- The carbon dioxide is passed into a strong alkali solution, which absorbs the carbon dioxide.
- This allows the nitrogen to accumulate in a graduated tube.
- The mass of the nitrogen can be calculated from the volume it occupies under known conditions of temperature and pressure.
- Therefore, the proportion of nitrogen in the sample can be determined.
- A volumetric method is also applied in the analysis of nitrates, which can be converted into nitric oxide (NO), a gas.
- Production or consumption of carbon dioxide during biological processes often is measured volumetrically.
- The composition of fuel gases and combustion products can be determined by measuring the changes in volume.
- This occurs when the sample is treated successively with reagents that specifically absorb components such as carbon dioxide, carbon monoxide, and oxygen.
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