why phenolpthalin gives pink colour when we titrate aganist
sodium hydroxcide & phenolpthalin gives colourless titrate
aganist hydrochlric acid which is un burate
Answer Posted / 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.
Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
What is the difference between Discriminating media and DPDM(Dissolution Profile with Different Media)
Please tell me about the pH of Polycaboxylic ether is it in the 5-6 range ever or more than 6
calibrtion procedue of LC-MS
how much mass should be there in volumetric flask while in preparation of sample for assay?
how we can identify the impurity is coming below loq at transfering site?
What is the difference between chromatographic purity and related substances?
why should we perform dissolution PVT calibration only by UV spectrometer, not by HPLC ?
We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy
what is the principle involved in turbidometry and nephelometry ?
what is the importance of peak purity in HPLC and how we can calculate through manul(not software)?
How require to develop GC method? how to select diluent, GAS, column selection and other chromatographic conditions?
what parameters we will consider while developing a HPLC method and how we confirm our HPLC method is valid?
How do we fix the sample concentaryion in hplc method development. What is the basis?
in dissolution if one bowl got 70 percent 2nd bowl got 80 percent and 3rd bowl got 90 percent then how proceed?
In IR spectra, generally a molecule vibrates without apply emr or ir light?