Total Alkalinity OR Ammonia Content Of Latex

AIM:

To determine the Total alkalinity or Ammonia content of  latex .

DEFINITION  OF TOTAL ALKALINITY OR AMMONIA CONTENT :

The term denotes the free alkali content of latex.

APPARATUS:

50ml Erlenmeyer flask,Stopper,500ml beaker, glass rod, Electronic balance,burette.

REQUIREMENTS:

Latex, distilled water, Methyl Red indicator, 0.1N HCl

PROCEDURE:

• Take about 20-25ml of well mixed sample of latex in a stoppered erlenmeyer flask.
• Take 200ml distilled water in a 500ml beaker.Add 5-6 drops of methyl red indicator. A yellow color is obtained.
• Weigh 2gm latex from the erlenmeyer flask & note the weight.
• Pour this latex into the beaker containing methyl red indicator.( step 2 mentioned above).
• The contents are titrated with 0.1N HCl from the burette till the yellow color changes to pink.Note down the volume of the acid.

CALCULATION:

From the weight of latex taken, volume of HCl & the normality of HCl, the Ammonia content of latex can be calculated