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10 Mar 2007 13:59:11 IST

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776

volumetric analysis

None

31.65 ml of 0.165 M Ba(OH)₂requires 25 ml of citric acid H₃C₆H₅O₇

for almost complete neutralisation. Find the concentration of citric acid.

hey, i applied m1v1=m2v2 but still not getin the ans

plzzzz help

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001sri

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Joined: 28 Dec 2006

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10 Mar 2007 15:24:14 IST

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did u took care of basicity n acidity?
ans is 0.13926M.
give me the given ans.!!!

Manasi

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10 Mar 2007 16:47:55 IST

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the structure of citric acid is attached below, as clear frm figure its basiscity is 4, thrfore

4 X 25 X M = 2X 31.65 X 0.165

frm here u'll get the value of M....

avik1

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10 Mar 2007 19:09:27 IST

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i want to know why cant i use m1v1=m2v2??????????????

wat u r doing is n1v1=n2v2 right??????

ernst

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10 Mar 2007 19:28:57 IST

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i face lot of problems in stoichiometry can any one help?what should i do?

abhijeet singh

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10 Mar 2007 19:35:03 IST

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i think i can explain
the formula is
m1v1/n1=m2v2/n2
where n1&n2 are no of moles in equation
and not m1v1=m2v2
as told by magiclko basicity of citric acid is 4
therefore 1/2 mole is required to neutralise imle of Ba(OH)2
31.65x0.1645/1=25xM/0.5
we get 0.1044M
which should be the correct ans
i you find my solution correct plz plz rate me.if not plz point out the mistake

abhijeet singh

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10 Mar 2007 22:05:22 IST

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did u get the method????

Manasi

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10 Mar 2007 22:39:30 IST

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we cant do m1v1=m2v2, cuz the law of equivalence statets that no of equivalents of reactants consumed in a rxn= no of equivalents of products formed in the rxn....

Bipin Dubey

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12 Mar 2007 00:59:33 IST

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Apply N₁V₁ = N₂V₂

Basicity of citric acid is 4.
Acidity of Ba(OH)₂ is 2.

Hence (4)(25)(M) = (2)(31.65)(0.165)

M = .104445

abhijeet singh

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12 Mar 2007 14:04:03 IST

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but i have found the correct ans with m1v1/n1=m2v2/n2
which means my method is correct too .isnt it???

Aditya Arora

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12 Mar 2007 16:04:15 IST

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Look avik1,

WE are using n1v1 = n2v2 because for neutralization, the number of milliequivalents of acid and base are equal. in the above equation, n1*v1 is equal to the number milliequivents.

m1v1 is equal to the number of moles. And it is not necessary that number of moles of acid and base should be equal !!!

Hope you have got it !!!

abhijeet singh

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12 Mar 2007 16:32:31 IST

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m1v1 is equal to no of moles,but isnt m1v1/n1 equal to no of equivalents

abhijeet singh

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14 Mar 2007 14:09:04 IST

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atleast anyone correct me or agree with me!!!!!!

avik1

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15 Mar 2007 20:13:28 IST

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thanks abhijet

thanks a lot.............

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