Question 109
In the conservation-of-mass investigation, calcium carbonate reacts with dilute hydrochloric acid in a flask, with a stopper, on a top pan balance. Some students found the mass of each piece of apparatus and each chemical separately before they mixed the chemicals together in the flask, put the stopper in and placed the flask on the top pan balance. Do you think the mass of all the items added together will be the same as the reading on the balance at the end of the reaction? Give a reason for your answer.
