Equal length of magnesium ribbon are taken in two test tubes ‘A’ and ‘B\ H2SO4 is added to test tube ‘A’ and H2CO3 in the test tube ‘B’ in equal amounts:
(a) Identify the test tube showing vigorous reaction.
(b) Give reason to support your answer.
(c) Name the gas liberated in both the tubes. How will you prove its liberation?
(d) Write chemical equations for both reactions.
(e) Out of the two acids taken above
(i) which one will have lower pH value.
(ii) lower H+ concentration respectively.
(a) A will show vigorous reaction.
(b) It is because H2SO4 is strong acid.
(c) Hydrogen gas will be formed. Bring a burning splinter near the gas. It will burn with ‘pop’ sound. It shows gas liberated is hydrogen.
(d) Mg + H2SO4 → MgSO4 + H2
Mg + H2CO3 → MgCO3 + H2
(e) 'A' (H2SO4) will have lower pH.
'B'(H2CO3) will have lower concentration of H+