Direction: In the following questions a statement of Assertion (A) fo...
Sulphur is estimated by Carius method in the form of white precipitate of BaSO4 on heating with fuming and BaCl2. If light yellow solid is obtained means impurities are present. It is filtered, washed and then dried to get pure BaSO4.
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Direction: In the following questions a statement of Assertion (A) fo...
Assertion (A): Sulphur present in an organic compound can be estimated quantitatively by various methods.
Reason (R): Sulphur is separated easily from other atoms in the molecule and gets precipitated as a light yellow solid.
The correct answer is option 'C', which states that both the assertion and reason are not correct.
Explanation:
To determine the presence and quantity of sulphur in an organic compound, various methods can be employed. These methods include gravimetric analysis, titration, and instrumental techniques like spectroscopy.
Gravimetric Analysis:
In gravimetric analysis, sulphur can be precipitated as a solid compound, such as barium sulphate (BaSO4). By weighing the precipitate, the amount of sulphur in the original compound can be determined quantitatively. However, it is important to note that not all sulphur-containing compounds can be precipitated as barium sulphate, so this method may not be applicable to all organic compounds.
Titration:
Another method to estimate the quantity of sulphur in an organic compound is through titration. In this method, a solution of known concentration, such as iodine, is added to the compound containing sulphur. The reaction between iodine and sulphur produces a compound that can be titrated with a standard solution of sodium thiosulphate. The amount of sodium thiosulphate required to neutralize the reaction indicates the quantity of sulphur present.
Instrumental Techniques:
Modern instrumental techniques like spectroscopy can also be used to quantitatively determine the presence of sulphur in an organic compound. For example, infrared spectroscopy can identify the characteristic absorption bands of sulphur-containing functional groups, allowing for the estimation of sulphur content.
In conclusion, the assertion that sulphur present in an organic compound can be estimated quantitatively by various methods is correct. However, the reason given that sulphur is easily separated from other atoms in the molecule and precipitated as a light yellow solid is not entirely accurate. The separation and precipitation of sulphur depend on the specific compound and the method being used for analysis. Therefore, option 'C' is the correct answer.
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