Question

distinguish between dilute sulphuric acid and dilute hydrochloric acid using lead nitrate​

Answer 1

Answer:

On adding lead nitrate to both acids you will get a white precipitate. Now, heat the solution and the one whose precipitate will redissolve will be dil.HCl and the one with insoluble precipitate will be dil.H2SO4.

Actually on adding lead nitrate to HCl, PbCl2 precipitates out and on heating the solution it redissolves. But in case of H2SO4, PbSO4 is formed which is insoluble even on heating it.

dilute HCl- Pb(NO3)2+2HCl⇒PbCl2+2HNO3

                here PbCl2 is insoluble bot soluble in hot water.

dilute H2SO4- Pb(NO3)2+2H2SO4⇒PbSO4+2HNO3

                here PbSO4 is insoluble.

Explanation:

Sulphuric acid precipitates the insoluble sulphate from lead nitrate solution. Lead nitrate reacts with hydrochloric acid to give a white ppt. of lead chloride.