Class 12 Chemistry Practicals Volumetric Analysis Estimation Of Sodium Hydroxide

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Ex.No: 04.  ESTIMATION OF SODIUM HYDROXIDE
 
AIM:
 
To estimate the amount of Sodium hydroxide dissolved in 250ml of the given unknown solution volumetrically. For this you are given with a standard solution of sodium carbonate normality 0.0948 N and hydrochloric acid as link solution.
 
PRINCIPLE:
 
Neutralization of sodium carbonate by HCl is given below. To indicate the end point, methyl orange is used as an indicator
Class 12 Chemistry Practicals Volumetric Analysis Estimation Of Sodium Hydroxide
 
Neutralization of sodium hydroxide by HCl is given below. To indicate the end point, Phenolphthalein is used as an indicator
Class 12 Chemistry Practicals Volumetric Analysis Estimation Of Sodium Hydroxide1
 
PROCEDURE:
 
TITRATION – I: (Std Na2CO3) Vs (link HCl):
 
Burette is washed with water, rinsed with link HCl solution and filled with the same HCl solution upto zero mark. Exactly 20 ml of Na2CO3 solution is pipetted out into the clean, washed conical flask. To this solution 2 to 3 drops of methyl orange indicator is added and titrated against HCl link solution from burette. HCl is added drop wise till the colour change from straw yellow to pale pink. Burette reading is noted and the same procedure is repeated to get concordant values.
 
TITRATION – II: (Link HCl) Vs (unknown NaOH):
 
Burette is washed with water and rinsed with link HCl solution and filled with the same HCl solution upto zero mark. Exactly 20 ml of NaOH solution is pipetted out into the clean, washed conical flask. To this solution 2 to 3 drops of phenolphthalein indicator is added and titrated against HCl link solution from burette. HCl is added drop wise till the pink colour disappears completely. Burette reading is noted and the same procedure is repeated to get concordant values.
 
 

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Chemistry Class 12 Exam Resources: Volumetric Analysis Estimation Of Sodium Hydroxide

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