Post-Lab Questions 1 A student is studying the reaction between aqueous solution
ID: 538811 • Letter: P
Question
Post-Lab Questions 1 A student is studying the reaction between aqueous solutions of magnesium sulfate and sodium carbonate. s would you expect to form in the reaction between solutions of magnesium sulfate and a What compound sodium carbonate? b Using the solubility table on the back table, what precipitate(s) would you expect to observe? e The student reports that when the magnesium sulfate solution is added to the sodium carbonate solution white precipitate forms. However, when the student adds sodium carbonate solution to a magnesium sulfate solution no precipitate forms. Does this information make sense? Why or why not? 2 Dehydration plays a role in the formation of kidney stones composed of calcium oxalate, CaC,O, Why would increasing a patient's intake of water help reduce the formation of kidney stones? 3 x-ray films consist of a flexible plastic base coated in a gel that contains 3 X-tay flms consist of a flexible plastic base coated in a gel that contains light sensitive silver halide crystals (Ge, silver bromide and silver chloride). These films are exposed to X-ray radiation to produce images of the inside of a subject Once the films are no longer needed, it is common practice to recycle the film to recover the silver. This process is done by shredding the film and placing it in a large cyanide solution bath. The siver is precipitated out as silver cyanide. a What can you conclude about the water solubility of silver cyanide? Using your knowledge of limiting reactants, how can the process be optimized to ensure that the maximum amount of silver is recovered? bExplanation / Answer
Q1.
a)
MgSO4(s) + Na2CO3(s) react to form:
MgSO4(s) + Na2CO3(s) --> Na2SO4(aq) + MgCO3(s)
b)
solubility will show that
MgCO3 = not soluble
Na2SO4 = soluble due to Na+ presence
c)
white precipitate must be MgCO3(s)
if Na2CO3 is added, no solution forms... this info does NOT makes sense, since we already stated that Na2CO3 + MgSO4 in aqueous solution should form Na2SO4 and MgCO3
the only logical thing to expect is that MgSO4 is already saturated, so solid will not react with NA2CO3 solid