What are the possible sources of error and limitations when dissolving copper sulfate in water ;leaving it alone for 10 minutes , then filtrating it .

This is a solution, hope i could

The answer to your q the total mass is 73

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

If your on odysseyware i believe the answer would be c.