When does phenolphalien turn pink

Answer : Phenolphalien turn pink in the presence of a base.

Phenolphthalien : It is an indicator which is used in the acid-base titration.

In acidic medium, the phenolphthalien is colorless and the pH will be less than 7.

In basic medium, the phenolphthalien is pink in color and the pH will be greater than 7.

Phenolphthalien is slightly soluble in the water and highly soluble in alcohols.

Hence, the phenolphalien turn pink in the presence of a base.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

plasma - state of matter made up of electrically charged particles