How is molarity calculated?

Please write an essay regarding the questions below relating to the lab experiment. Please do not add the questions in the essay. Topic:

Gravimetric Determination of Calcium Questions:  Why was urea was added ?  How is molarity calculated?

 Discuss at what points in the

experiment you might have “lost” some of the precipitate.  Any modifications in the procedure to minimize the loss of solids.

 Any other suggestions to improve the result Copy of the lab experiment is attached. Thank you