What happens when barium chloride is added to arsenious sulphide sol?
Answers
However, the precipitation value of the cation will depend upon the valency of the cation. Thus univalent cations such as sodium ion (Na+) have much less precipitation power and, therefore, in their case large amount of salt will have to be added to precipitate the arsenious sulphide sol. On the other hand, bivalent cations such as barium ions (Ba2+) have much greater precipitation power and a lesser amount of such salts will be needed for precipitating the arsenious sulphide sol. The trivalent cations such as aluminium ions (Al3+) have still greater precipitation power and still lesser amount of aluminium salt is needed for precipitating arsenious sulphide sol.
Apparatus
Three conical flasks (100 ml), a burette and a beaker.
Materials Required
Arsenious sulphide sol, 0.1 M sodium chloride solution. 0.011 M barium chloride solution, 0.001 M aluminium chloride solution.
Procedure
Take three conical flasks and label them as 1, 2, 3.
To each conical flask transfer 20 ml of the arsenious sulphide sol.
To the sol in the test-tube No. 1 add 0.1 M NaCl solution drop by drop with the help of a burette. Shake gently after the addition of each drop. Continue the addition till a yellow precipitate of arsenious sulphide is just formed. Note the volume of sodium chloride solution required for precipitation of arsenious sulphide sol.
Now, to the sol in conical flask No. 2 add 0.01 M BaCl2 solution dropwise. Measure the volume when a yellow precipitate of arsenious sulphide is just formed.
Similarly, to the sol in the conical flask No. 3 add 0.001 M. AlCl3 solution dropwise. Measure the volume when a yellow precipitate of arsenious sulphide is first formed.
Answer:
Explanation:
Arsenious sulphide sol consists of colloidal particles of arsenious sulphide, As2S3, dispersed in water. It is a negatively charged sol. It will be precipitated by positively charged ions.
However, the precipitation value of the cation will depend upon the valency of the cation. Thus univalent cations such as sodium ion (Na+) have much less precipitation power and, therefore, in their case large amount of salt will have to be added to precipitate the arsenious sulphide sol. On the other hand, bivalent cations such as barium ions (Ba2+) have much greater precipitation power and a lesser amount of such salts will be needed for precipitating the arsenious sulphide sol. The trivalent cations such as aluminium ions (Al3+) have still greater precipitation power and still lesser amount of aluminium salt is needed for precipitating arsenious sulphide sol.
Apparatus
Three conical flasks (100 ml), a burette and a beaker.
Materials Required
Arsenious sulphide sol, 0.1 M sodium chloride solution. 0.011 M barium chloride solution, 0.001 M aluminium chloride solution.
Procedure
Take three conical flasks and label them as 1, 2, 3.
To each conical flask transfer 20 ml of the arsenious sulphide sol.
To the sol in the test-tube No. 1 add 0.1 M NaCl solution drop by drop with the help of a burette. Shake gently after the addition of each drop. Continue the addition till a yellow precipitate of arsenious sulphide is just formed. Note the volume of sodium chloride solution required for precipitation of arsenious sulphide sol.
Now, to the sol in conical flask No. 2 add 0.01 M BaCl2 solution dropwise. Measure the volume when a yellow precipitate of arsenious sulphide is just formed.
Similarly, to the sol in the conical flask No. 3 add 0.001 M. AlCl3 solution dropwise. Measure the volume when a yellow precipitate of arsenious sulphide is first formed.