Quantitative Analysis of Organic Compounds
Chemistry ⇒ Carbon and Organic Chemistry
Quantitative Analysis of Organic Compounds starts at 11 and continues till grade 12.
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Describe the role of silver nitrate in the estimation of halogens by Carius method.
Explain why a combustion tube is used in the estimation of carbon and hydrogen.
Explain why copper oxide is used in the Dumas method.
Explain why oxygen is not usually estimated directly in organic compounds.
A 0.2 g sample of an organic compound gave 0.3 g of AgBr in the estimation of bromine. Calculate the percentage of bromine in the compound.
A 0.25 g sample of an organic compound gave 0.44 g of CO2 and 0.18 g of H2O on combustion. Calculate the percentage of carbon in the compound.
A 0.3 g sample of an organic compound containing nitrogen was digested by Kjeldahl’s method. The ammonia evolved required 25 mL of 0.1 N H2SO4 for neutralization. Calculate the percentage of nitrogen in the compound.
A 0.4 g sample of an organic compound gave 0.5 g of AgCl in the estimation of chlorine. Calculate the percentage of chlorine in the compound.
Which gas is absorbed in potassium hydroxide solution during the estimation of carbon and hydrogen by Liebig’s method? (1) CO2 (2) SO2 (3) NH3 (4) NO2
Which method is used for the estimation of phosphorus in organic compounds? (1) Carius method (2) Dumas method (3) Kjeldahl method (4) Victor Meyer method
Which of the following elements cannot be estimated by the Dumas method? (1) Nitrogen (2) Sulphur (3) Carbon (4) Hydrogen
Which of the following is a limitation of Kjeldahl’s method? (1) It cannot estimate nitrogen in nitro compounds (2) It cannot estimate nitrogen in azo compounds (3) It cannot estimate nitrogen in amines (4) Both 1 and 2
Fill in the blank: The empirical formula is the simplest whole number ratio of _______ in a compound.
Fill in the blank: The mass of water formed in the combustion of an organic compound is used to calculate the percentage of _______.
Fill in the blank: The molecular formula is a whole number multiple of the _______ formula.
Fill in the blank: The percentage of hydrogen in an organic compound is calculated from the amount of _______ formed during combustion.
State True or False: The Carius method can be used for the estimation of both halogens and phosphorus.
State True or False: The percentage of oxygen in an organic compound is usually determined by difference, after estimating other elements.
True or False: The Carius method is used for the estimation of halogens and sulphur in organic compounds.
True or False: The Dumas method involves the conversion of nitrogen in the compound to nitrogen gas.
