charateristic test for so2 gas
Answers
Answered by
7
If paper impregnated with potassium dichromate solution turns green, sulfur dioxide may be present (it reduces chromium(VI) to chromium(III)).
Of course, this is a rather unsatisfactory test because any sufficiently powerful reducing agent will bring about the same reaction. A better one is to pass the gas sample through H2O2 (or add H2O2 to the solution, whatever). The following redox reaction takes place:
SO2 + H2O2 -----> H2SO4
causing a large and easily detectable drop in pH.
Of course, this is a rather unsatisfactory test because any sufficiently powerful reducing agent will bring about the same reaction. A better one is to pass the gas sample through H2O2 (or add H2O2 to the solution, whatever). The following redox reaction takes place:
SO2 + H2O2 -----> H2SO4
causing a large and easily detectable drop in pH.
pranav365:
thank you
Similar questions