The experiment is Gravimetric Determination ofCa2+. Please answer as many questions as youcan.
Write all the balanced equations involved in thisexperiment.
What is the purpose of urea? Can another base like NH4OH be usedinstead? Why?
Why was the reaction heated (to gentle boil) after addingurea?
What is the molarity of concentrated HCl (12 M)? How would youprepare 100 mL of O.1 M dilute HCl solution from it?
What is methyl red? Why was it used?
An aqueous solution of CaC2O4 would be basic, acidic or neutral?Why?
The product on the crucible was rinsed with cold water. What isthe purpose of the rinse? What will happen if hot/warm wasused?
Suggest a practical use of this lab (gravimetric determinationof Ca) in real world?
What is water of hydration? How/Why does it become part of acrystalline inorganic molecule?
What happens when CaC2O4.H2O is heated at >500 0C for longtime?
A 10.00 mL solution containing Cl- was treated with excess AgNO3to precipitate 0.4368 g of AgCl. What was the molarity of Cl- inthe unknown? FW of of AgCl is 143.321 g/mol.
