The acidic waste from a student's experiment needs to be disposed of, but pouring it down the sink would increase the impact of acid rain on the local water supply. Explain how you could determine the amount of limestone needed to neutralize the environmental impact of the experiment. (Assume the that limestone is mainly calcium carbonate.)
Write a balanced equations for any reactions you intend to use.
H2SO4(aq) + CaCO3(s) --> H2O(l) + CO2(g) + CaSO4(s)
The Attempt at a Solution
- measure the concentration of the acid and the volume of the acid
- grain the lime stone into powder and measure the weight
- add methyl red or other indicator into the acid
- slowly add the lime stone powder bit by bit until the indicator colour changes
- measure the weight of the remaining lime stone and subtract it from the initial weight to obtain the mass of lime stone used to neutralize the acid
- Determine the mass of lime stone needed to neutralize each Litre of the acid
Is that right?
The problem is that the salt produced from this chemical reaction is a solid. Would this affect the result?
And it might be hard to accurately put lime stone into the acid.
Is there a better way or a more correct way to do it?