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Grade 12th passPhysical Chemistry

x ml of 0.01 N HCl are required for titration against a mixture of NaOH and Na2CO3 using phenolphthalein as indicator, when the colour changes from pink to colourless, few drops of methyl orange were then added and the titration was continued. Additional 'Y' ml of 0.01 N HCl were required. Which of the following vaues of X and Y are possible ?
A. X = 10,Y = 130
B. X = 148 ,Y =54
C. X = 36 ,Y =63
D. X = 420 ,Y =140
pls give detailed Ans. . .

Profile image of Yasir Rather
7 Years agoGrade 12th pass
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1 Answer

Profile image of Avni Chauhan
ApprovedApproved Tutor Answer7 Years ago
titration takes place here in 2 steps.
1st step : NaOH and half equivalents of sodium carbonate are neutralised.
2nd step : the rest half sodium carbonate

x should be more than y
both b and d are possible answers.