23identical concentrations of the 4 compounds are provided .........
This question was asked in JEE 2010.
There has been a controversy regarding the solutions . Some of the institutes say the correct answer to be ( D ) and some (C,D) .What do you guys think ?
They have given no other data that whether HNO3 is limiting or not. Then should we consider this case or not ?
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10 Answers
1No, but what if they are equal in volume .They would react completely and no buffer action then. Even if Volume of HNO3 is more then also there would be no buffer action. So how can we assume HNO3 is limiting ? Look at these three cases -
REMEMBER - Concentration is Identical not the volume that we have mixed, so amount of HNO3 and CH3COONa can be varied.
CASE 1 -
HNO3 is Limiting .
In this case we will have buffer action . There will be some amount of acetic acid and sod. acetate present in the soln.
CASE 2 -
Volume of HNO3 and CH3COONa is equal.
In this case they would react completely and hence no sod. acetate hence no buffer action.
CASE 3 -
HNO3 is in Excess.
In this case HNO3 and Acetic Acid will be present in the solution. Hence there is no buffer action.
Even if one the possible cases is found to be wrong ,Generally the option is assumed to be wrong .
1Concentration is Identical not the volume that we have mixed, so amount of HNO3 and CH3COONa can be varied.
1bufeer is weak acid with salt of a strong base ????
HNO3 is not weak right???
1Definitely HNO3 isn't weak but it can produce a weak acid on reaction with sodium acetate i.e Acetic Acid !
1Definitely HNO3 isn't weak but it can produce a weak acid on reaction with sodium acetate i.e Acetic Acid !
1357It can be C and D
The explanation given by jabbujabbu is correct