Answer / b.gangatharan

According to Quinonoid theory acid base indicators exist in two tautomeric forms having different structures. phenolphthalein has benzenoid form in acidic medium and thus it is colourless while it has quinonoid form in alkaline medium which has pink colour.

Thanks,
B.Gangatharan.
Caplin Point.

Please do not join if u got offer in oncotherapies ltd (STRIDESARCOLAB)especially Mr.Mahesh Bhatt team because job is not secure his team and doesn't have confidence on him becareful this offer?

1 Answers   Strides Arcolab,

---

why required specificity in valdation

3 Answers  

---

What is the difference between HPLC and GC?

3 Answers  

---

How can we calculate offset value pH measurment

0 Answers   Dr Reddys,

---

what is use of acetonitrile compare to methanol in RP-HPLC Method devlopment

7 Answers   Neuland, Orchid,

---

How you start the method development of unknown compound.

1 Answers  

---

what is difference between Performance check and Calibration?

1 Answers  

---

Do you know what Trace metal clean technique is?describe that technique?

1 Answers   Mylan, Nirma, Oil and Gas Jobs, Reddy Labs,

---

What about karl fischer reaction mechanism ?

2 Answers   Aurobindo, Mylan,

---

Why KBr pellet is used in IR?

11 Answers   Glochem,

---

why we are using benzene, anyline in acetic anhdride assay titration method?

0 Answers  

---

what are the sources in ELSD,PDA, RI and UV Detectors?

1 Answers  

---