Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: shon on September 19, 2007, 01:58:51 PM

Title: volumetric analysis-acid base and redox
Post by: shon on September 19, 2007, 01:58:51 PM

KA1 is a solution containing hydrated ethanedioic acid and sodium ethanedioate.
KA2 is a solution containing 3.5g potassium manganate per dm³.
KA3 is a solution containing 1.7g hydroxyl ion per dm³.
KA4 is 1.0 mol dm^-3 sulphuric acid.

first titration,
pipette 25cm³ KA1 into titration flask. Add phenolphthalein and titrate this solution with KA3

25cm³ KA1 required 16.22cm³ of KA3 for complete reaction.


second titration,
 pipette 25cm³ KA1 into titration flask.Then add 25cm³ of KA4.Heat this solution to about 60C and titrate the solution with KA2 until a faint pink colour persists in solution.

25cm³ KA1 required 24.47cm³ of KA2 for complete reaction.



how do i calculate,
(i) the concentration of hydrated ethanedioic acid in solution KA1?

(ii)mass of ethanedioate ion in 1 dm³ of KA1?

(iii) the concentration of of ethanedioate ions which originated from the sodium ethandioate salt?

(iv)why  solution KA4 added to solution KA1 before titration?


PLEASE HELP ME I AM KINDA LOST. Thank you

Title: Re: volumetric analysis-acid base and redox
Post by: Borek on September 19, 2007, 02:21:09 PM

Start with reaction equations.

Title: Re: volumetric analysis-acid base and redox
Post by: xkbi88 on September 20, 2007, 06:46:51 PM

Shon u manage to get the answers???