Respuesta :
The given process is that of an acid-base titration where the base is taken in the burette and is being titrated against an acid taken in a flask. The steps in the correct order are:
1) Transfer a known volume of acid to an Erlenmeyer flask.
2) Add three drops of chemical indicator to the acid.
3) Position the Erlenmeyer flask under the buret.
4) Add base from the buret to the acid.
Ans: ii) , iii), iv) and i)