TEXTILE CHEMICAL

HOW TO FIND PERCENTAGE PURITY OF ACETIC ACID

   Chemical formula                         CH3COOH

   Molecular weight                          60 gm/mole

   Equivalent weight                         60 gm/mole

   Form                                             Liquid

   Smell                                            Pungent

   Solubility                                      Good

    Acetic acid is a volatile organic acid. it is used in wet processing i.e. bleaching, dyeing and printing and finishing to maintain the pH on the acidic side i.e. - 7.

  Method to find our percentage purity :

    About 1 -2 gm of acetic acid is dissolved in 250 ml of distilled water in a measuring flask and 10 ml of this solution is tit rated against 0.1 N standard NaoH solution using phenolphthalein as an indicator. In this method end point is colorless to pink.

   Chemical  Reaction :

    CH3COOH         +     NaoH    ------------------------------>  CH3COONa     +  H2O

   Acetic acid             Sodium           Neutralization        Sodium acetate     water 

                               Hydroxide 

    Formula :

   Percentage     E.Q of CH3COOH x N. of NaOH x B.R           250    

   purity of    =  ------------------------------------------------- x   -----   x 100

   acetic acid      1000 x weight of  acetic acid dissolved in    10

                                                         250 ml

            E.Q = Equivalent weight

            N     = Normality

            B.R = Burette reading

                                                 

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