Interview Questions Answers in Analytical Chemistry

ramya

{ City } hyderabad
< Country > india
* Profession * research associate
User No # 69398

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Question { Dr Reddys, 10290 }

IF THE COMPOUND PKA IS 5.3 WHY WE ARE ADJUSTING PH+/-2 OF
THE COMPOUNDS PKA. WHAT IS THE CONDITION

Answer

pKa=pH+log [un ionised]/[ionised]
at the half neutralisation point
un ionised concentration= ionised concentration

so pKa=pH+log1
pKa=pH because log1=0

if we didnt adjudt pH +/-2.0 we may get peak split because
for un ionised we get one peak and ionised we get one more
peak

Is This Answer Correct ?

3 Yes

1 No

Question { Dr Reddys, 10290 }

IF THE COMPOUND PKA IS 5.3 WHY WE ARE ADJUSTING PH+/-2 OF
THE COMPOUNDS PKA. WHAT IS THE CONDITION

Answer

Is This Answer Correct ?

1 Yes

2 No

Question { 17155 }

why IR graph or spectra comes down ? Any reason

Answer

In HPLC we are taking absorbance on Y-AXIS in IR we are
taking transmittance on Y-axis, absorbance is inversly
proportional to transmittance so IR Spectra comes down

Is This Answer Correct ?

18 Yes

0 No