By Virmani, O. P.; Narula, A. K.
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Extra info for Applied Chemistry Practice
Carbonate Alkalinity is equivalent to 2A 1111 of the acid and Bicarbonate Alka linity is equivalent to (B - A) 1111 of the acid. (5) When the sample contains only Bicarbonate, it does not give a pink colour with phenolphthalein indicator. Therefore A, the volume of acid c'ollsumed with phenolphthalein indicator is zero. 15). Bicarbonate Alkalinity is therefore equal to Total or Methyl Orange Alkalinity. Procedure With a pipet, transfer 100 ml of the water sample into a titration Bask. Add 2 drops of phenolphthalein indicator and litralc against N/SO H 2S04 until the pink colour Applied Chemistry 42 just disappears.
303 t1 V ----log. 12 % 25 Chemical Equilibrium and Chemica! 303 I = - - og 12 -II v - \fI[ 00 -=-:---=-0- V'x> - Vtz remain almost constant, tbe hydrolysis of methyl acetate catalyscd by acid is a first ordt'r reaction. (2) The average of the various values of k is the velocity constant of the reaction at the temperature of the experiment. 3 To compare the strengths ofHel and H §O4 by studying their catalysing action on hydrolysis of methyl acetate Reagents Required 1. Standard hydrochloric acid (N/2) 2.
However, such a detailed analysis is not done in routint work and other methods have to be used. As both alkalinity and hardness are expressed in terms ofCaC0 3 , eH and NCH may be calculated as follows: When When alkalinity < total hardness, CH (in ppm) >= Alkalinity (in ppm). 29) alkalinity <'! 30) CH (in ppm) = Total hardness (in ppm) NCH == Total hardness - CH. 27] which are removed by filtration, thtreby causing an equivaknt dccrcase in alkalinity. Measurement of alkalinity before and after boiling thus affords a method of determination of temporary hardness.
Applied Chemistry Practice by Virmani, O. P.; Narula, A. K.