Question

a student dropped few pieces of marble in hydrochloic acid. the evolved gas was passed through lime water. what change would be observed in lime water? write a balanced eq for all the reactions involved

Answer 1

The formula of marble is Caco3
When it is added to hcl then the eq is
Caco3 + 2HCl = CaCl2 + H2O + Co2
So when evolved gas CO2 is passed through lime water it turns lime water into milky colour