Page 71 - PC 101 practical notes 24-25..

MANSOURA NATIONAL UNIVERSIY
PHARM D- CLINICAL PHARMACY LEVEL I PHARM. ANAL. CHEM. I (PC 101)

P Pr ro oc ce ed du ur re e : :

1) Transfer 10 ml of the sample into a clean conical flask.

2) Add 1 ml of 5% K 2CrO 4 indicator (by graduated pipette).

3) Titrate ≠ 0.01 N AgNO 3

st
{ Color at E.P.: 1 permanent darkening of the yellow chromate color }

-
--

Before starting tit.: Cl sample + CrO 4 ind.  Clear bright
(colorless) (yellow color) yellow solution
During tit. ≠ AgNO3: AgCl + Cl sample + CrO 4 ind.  Turbid bright
-
--
(white ppt) (colorless) (yellow color) yellow solution

--
At the end point: AgCl + CrO 4 ind. + Ag 2CrO 4  Turbid dark
(white ppt) (yellow color) (brick red ppt) yellow solution
few

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