As a lab, we will be given a small amount of calcium and will be told to find the mass of it without using a scale( using stoichiometry or mols?) I just don't know how to do this!
Thanks!
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2 answers
I don't know how easy this is supposed to be to accomplish or the accuracy you need; however, you could set up a gas generation system, drop the Ca into water (Ca + 2H2O ==> Ca(OH)2 + H2), measure the volume of H2 gas produced, and calculate the mass of the Ca that must have reacted. Another way is to do the same but measure the pH of the solution and calculate the OH^- necessary to produce that pH and from there the mass of the Ca metal. I don't think the latter would be as accurate. By the way, Anna, you should post your own question and not piggy back onto another. Most piggy backed questions go unanswered.
2 answers