pH

IIT JEE 2015 Forum › Physical Chemistry questions › pH

at isoelectric point, what is the pH?

#Chemistry #Physical Chemistry

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13 Answers

24

eureka123 ·2009-02-14 03:27:35

for which amino acid????????[12]

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21

tapanmast Vora ·2009-02-14 03:29:11

DEPENDS ON DA COMPOUND......

IT IS DA pH at which da compound in question wen treated 2 electrolysis does not drift toward either of the electrodes...... n jus below or beyond that pH it will move towards the respective electrod.......

hope i'm correct this time round [3]

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21

tapanmast Vora ·2009-02-14 03:29:47

the term is used 4 zwitterions...

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1

voldy ·2009-02-14 03:31:33

it's the avg of pK_a1 and pK_a2

i.e of the acid part and amino part.

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24

eureka123 ·2009-02-14 03:32:51

16 out of 20 acids have pHâ‰ˆ7
Aspartic acid ,Glutamic acid have pHâ‰ˆ3
Lysine and Agrinine have pHâ‰ˆ10.........This is the easies way to remeber..........[1]

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13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-14 03:34:39

pI=1/2(pK₁+pK₂)
They are carboxylic pK_a and amine pK_a
for amino acid with only one amine and one carboxyl group

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21

tapanmast Vora ·2009-02-14 03:35:44

hmmmm yah abhi n srinath r true...

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24

eureka123 ·2009-02-14 03:38:05

hey mathie reply..................what exactly do u want to ask?????[7]

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1

maddybaddie ·2009-02-14 03:42:14

wats d value 4 a neutral amino acid?

is it >7,=7 or <7 ?

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13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-14 03:45:15

<7

it is in the range 5 to 6.5

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1

maddybaddie ·2009-02-14 04:01:07

its rite abhirup...
but how r u getting it?

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13

Ð”Ð²Ò¥Ñ—ÑuÏ now in medical c ·2009-02-14 04:11:42

Aspartic acid ,Glutamic acid have pIâ‰ˆ3 they have -ve side chain charge
Lysine,Histidine,Arginine have pI>7 they are +ve

all others are neutrals and are in the range 5 to 6.5

if carboxylic pKa and amine pKa are given then pI can be calculated

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1

maddybaddie ·2009-02-14 04:45:30

k...got it!
thanx! :)

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Your Answer

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