Interested to Buy Any Domain ? << Click Here >> for more details...
In acid base titration, after complet consumption of HCl by
NaOH, addition of next drop of NaOH will give pink colour
with phenolpthalein indicator. Why this pink colour appear?
Why not blue, black, green or anything elese?
- 3 Answers
- 11548 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / sarma dvv
Phenolpthalein indicator pH range = 8.2 To 10.0.
In this pH region only Phenolpthalein indicator shows pink
colour. below this pH it was colour less.
In acid base titration, Hcl neutralisation by NaOH,after
completion of neutralisation,affition of next drop of NAOH
the pH of the solution will be above 8.2. for this reason
it was showing pink colour
| Is This Answer Correct ? | 31 Yes | 3 No |
Answer / arti naik
The pink colour appears due to the change in the structure
of the phenolphthalein indicator and it forms a disodium
salt due to the base NaOH which then gives it a pink colour.
| Is This Answer Correct ? | 7 Yes | 3 No |
Answer / umesh patel
in basic media(in NaoH), phenolphthelin shows pink color
only
colorless if pH of the media goes below 8
pink color will appear if pH goes beyond the pH of 10.00
| Is This Answer Correct ? | 11 Yes | 8 No |
why ur using toulene in hexane in u.v calibration?
3 Answers Biological.e.limited, Cipla,
what is the meaning of linearity,principle of co-relation coefficient?
As per ICH related substances stability trend limit from initial to shelf life
0 Answers Medley Pharmaceuticals, Micro Labs,
how pda detector works over uv?
in which situation require to use paddle and basket?
why we are using benzene, anyline in acetic anhdride assay titration method?
What is the difference between chiral cel OD-H & OD-RH ?
what is the need of calulation of RRF of impurity in HPLC analysis?
On which pharmacopoeia basis we can calibrate instruments like HPLC,GC,UV,DISSO,IR etc...
9 Answers Cipla, Laurus, Micro Labs,
What is the difference b/w OVI Solvents and Residual Solvents in case of Gas Chromatogaphy and What is its Detection Limit?
8 Answers Jubilant Organosys, Suven Life Sciences,
What are the differences between GC and HPLC?
What is Delay & Dead Volume
Organic Chemistry 
