Question

A students dropped few pieces of marble in dil hcl contained in a test tube he passed the evolved gas through lime water
a. what change would be observed in lime water
b.what happens in excess gas is passed through lime water
c.write the balanced chemical equations for all the changes observed

Answer 1

a)

The lime water turns milky.

b)

If excess gas is passed:

The milkness will disappear from the last observation.

c)

For observation(c)

Ca(OH)2(aq)+CO2(g)------------->>>>CaCO3(s)+H20(l)

For observation (b)

CaCO3(s) + CO2(g) + H2O(l)--------------------->>>>>>Ca(HCO3)2(aq.)

Hope this helps you.

Answer 2

HEY MATE HERE IS YOUR ANS.--

✨Pieces of marble are thrown into hydro-chloric acid.

so ,  strong effervescence can be observed.
Calcium carbonate is dissolved by hydrochloric acid, thereby forming gaseous carbon dioxide: