Chemistry
Convert (i) NaHCO3 (ii) Na2CO3 to unstable carbonic acid by action with dil. H2SO4.
State the reason why ammonia is evolved when an ammonium salt and alkali are heated.
Answer
2NaHCO3 + H2SO4 [dil.] ⟶ Na2SO4 + 2H2O + 2CO2 ⟶ H2CO3 (unstable)
Na2CO3 + H2SO4 [dil.] ⟶ Na2SO4 + H2O + CO2 ⟶ H2CO3 (unstable)
Ammonia is evolved when an ammonium salt and alkali are heated because a less volatile base (e.g.,NaOH) displace the more volatile base, NH4OH and we get the products NH3 and H2O.
NH4Cl + NaOH ⟶ NaCl + H2O + NH3
Related Questions
Give equations for the decomposition of a metallic (i) chloride (ii) nitrate with conc. H2SO4.
State in the above reactions a reason for the formation of the respective acids from conc. H2SO4.
State whether litmus is a common acid-base indicator or a universal indicator.
Define pH value. What would you say about the pH of a solution in which
(i) H+ aq. ions = OH- ions
(ii) evolves CO2 when heated with Na2CO3
(iii) OH-ions > H+ aq. ions.