CALCULATION For Na2O
 

“A”ml  x 3.1 x normality of HCl   = C%

               Wt. Of sample 

For  Sio₂
 

_{“B”ml  x 15.02 x normality of HCl} 

           Wt. Of sample X 10 

Ratio of sodium silicate 

% of SiO₂          i.e               D%

% of Na₂o                          C%

Viscosity-  AS PER IS 3944 B4 CUP 

DETERMINATION OF IRON (as per Fe)

• Botanic Potassium Thiocynate ;- dissolve 1.0gm of potassium thiocynate in10ml of water. Add sufficient n-butano to makeup to 100ml. Shake vigorously until the solution is clear.
• Dilute H2SO4 :- approx.10% 
• Standard Iron solution : weight 0.702gm of Ferrus Ammonium sulfate. Dissolve in 10ml dilute H2SO4 then make up 1000ml with water. Transfer 10 ml of this solution in 100ml M.Flask and make up 100ml with water. 1ml of this solution is equivalent to 0.01mg of iron 

PRCEDURE :

• Sample Reading: take about 5gm of the sample accurately weighted. Dissolve it in distilled water and make the solution exactly 100ml. Take 10 ml of this solution add 1ml concentrated Nitric acid. Boil the solution and cool. Then transfer it into a nessler cylinder and add 30mg of Ammonium Persulfate and 15 ml of Botanic Potassium Thiocynate solution. Shake for 30 sec and allow the liquid to separate.
• Blank reading : take 10 ml distilled water. Add 1ml concentrated Nitric acid boil the solution and cool. Then transfer it into a nesseler cylinder and add 30 mg of Ammonium Persulfate and 15 ml of Botanic Potassium Thiocynate solution . Shake for 30 sec. And allow the liquid to separate. Then add Standard Iron Solution until the colour of Butanol Layers in Both Cylinder (Sample & Blank) 
  CALCULATION :

Iron as Fe (%w)  =  0.001 V

                                     W

Where, 

V= Volume in ml of Standard Iron Solution to add in Blank Reading

W= Weight in gm of sample