Give the structure of pyrphyuric acid. How would you prepare it? What would you observe when colourless HI is added to pyrphuric acid ?
Pyrosulphuric acid is oleum. It is obtained when sulphur trioxide gas is passed through conc H2SO4 solution.
The structure of pyrosulphric acid is
When colourless HI is added to pyrosulphuric acid, its colour becomes violet because pyrosulphuric acid oxidises I- to I2.
An organic compound 'A' on treatment with ammoniacal silver nitrate gives metallic silver and produces a yellow crystalline precipitate of molecular formula C9H10N4O4 on treatment with Brady's reagent. Give the structure of the organic compound 'A'.
Since the organic compound 'A' reduces ammoniacal silver nitrate (Tollen's reagent), it must be an aldehyde. Moreover, with Brady's reagent (2, 4-dinitro phenyl hydrazine) it gives a precipitate of molecular formula C9H10N4O4 it must be propanal (CH3CH2CHO). The reactions are as follows
Write with a balanced chemical equation how gypsum is used for the conversion of ammonia into ammonium sulnate without using H2SO4 ?
When NH3 and CO2 are directly introduced into a gypsum slurry, ammonium sulphate is obtained. This method is called continental engineering process.
CaCO3 is the byproduct of the reaction.
Calculate the number of H+ ions present in 1 mL of a solution whose pH is 10.
Given, pH = 10
[H+] = 1 x 10-10 mol/L
Number of H+ ions in 1 L of solution
= 6.023 1023 1 X 10-10
= 6.023 x 1013
Number of H+ ions in 1 mL of solution
= 6.023 X 1013 X 10-3
= 6.023 X 1010