Sciencemadness Discussion Board

Titration carbonate/bicarbonate

RU_KLO - 23-12-2024 at 04:47

I found a simple method of titration of carbonate/bicarbonate, by using 0.1N H2SO4 and phenolftalein and methyl organge indicators (the ones I have)

1) titrate the carbonate/bicarbonate solution, with phenolftalein, till pink disappears.
2) take note (carbonate concentration) A
3) add methyl orange and titrate to peach color.
4) take note B
5) bicarbonate concentration B-A.

Is this method valid?

Why will first all carbonate be neutralized by acid and none of the bicarbonate (1)? Why will H2SO4 "choose" to first neutralize carbonate instead of bicarbonate?

Thanks




Bedlasky - 23-12-2024 at 13:57

Yeah the method is valid.

Quote: Originally posted by RU_KLO  

Why will first all carbonate be neutralized by acid and none of the bicarbonate (1)? Why will H2SO4 "choose" to first neutralize carbonate instead of bicarbonate?


CO3(2-) + H+ --> HCO3(-)