Apparatus:
Separating funnel, beaker, measuring cylinder, funnel.
Chemicals: Petroleum Ether 400– 600 C, Conc. HCl, Methyl orange indicator.
Procedure:
* Take 150 ml of sample in separating funnel.
* Add 2-3 ml of concentrated HCl .
* Add 30 ml of Petroleum ether solvent.
* Add indicator methyl orange 2-3 drops.
* Stopper the separating funnel and [....]
Principle:
In a neutral or slightly alkaline solution, Potassium Chromate can
indicate the end point of silver nitrate solution.Silver chloride is precipitated
Quantitatively before red silver chromate is formed.Estimation of chlorine by
this method is known as Argento metric Titration.
Reagents:
* Potassium Chromate solution
* Standard Silver Nitrate Titrant
* Standard sodium chloride solution
Procedure:a) sample Preparation
* [....]
Apparatus :
* Furnace
* Whatman Filter paper No – 42
* Silica Crucible
* Funnel
Procedure :
* Take 20 ml of aerated sample and filter it through Previously weighed whatman paper No – 42
* Wait for complete filtration by giving 2-3 washings with distilled water.
* After complete filtration keep the paper in oven at 1000C for [....]
Equivalent weight (EW) = Molecular weight (MW) / Valencey. (Z)
Normality (N) = Equivalent weight (EW) / Volume of Solution (1000 ml.)
Meq = Actual weight (W) / Equivalent weight (EW)
Example:Molecular wt of K2Cr2O7 is 294.148 gm
Valency = 6 (because of Cr -6)
EW = 294.148/6 = 49.025
N = 49.025/1000 [....]