Problem 2 . Tin exhibits amphoteric properties and reacts both with acids and ba

Question

Problem 2.

Tin exhibits amphoteric properties and reacts both with acids and bases. Write reactions of tin with nitric acid when: a) dilute nitric acid generates tin(II) nitrate and ammonium nitrate; b) concentrated nitric acid produces stannic acid [formula is analogous to sulfurous acid].

Also, tin metal reacts with sulfuric acid and generates: a) with dilute sulfuric acid – tin(II) sulfate and flammable gas; b) with concentrated sulfuric acid – tin(II) sulfate and sulfur dioxide.

Being exposed to sodium hydroxide solution, elemental tin transforms into hexahydroxostannate(IV) anion and generates flammable gas.

Explanation / Answer

ANSWER;

The requied balanced chemical equations are given below

a) reaction with dilute nitric acid

4Sn + 10HNO3(dil) ------------> 4Sn(NO3)2 + NH4NO3 + 3H2O

b) Concentrated nitric acid

Sn + 4HNO3 (con.) -------------> H2SnO4 + 4NO2 + H2O

reaction with Sulphuric acid

a) Dilute H2SO4

Sn + H2SO4 (dil.) ------------> SnSO4 + H2 (g)

b) Concentrated H2SO4

Sn + 2H2SO4 (con.) ------------> SnSO4 + SO2 +2H2O

Reaction with sodium hydroxide

Sn + 2NaOH + 4H2O ---------> Sn(OH)62- + 2Na+ + 2H2 (g)

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