Stu Dent does the ternary mixture separation. His results are 50 % NaCl, 37 % Si
ID: 1086989 • Letter: S
Question
Stu Dent does the ternary mixture separation. His results are 50 % NaCl, 37 % SiO2, and 20 % CaCO3. The class average results for his lab section are 33 % for each species.
Analyze Stu’s results – choose one or more items for each of his chemical species, making sure the explanations are actually physically possible.
NaCl increased – the solid is still wet.
NaCl increased – the solid is contaminated with CaCO3.
NaCl decreased – the solid is lost by “splattering”.
NaCl decreased – the solid partially evaporated.
SiO2 increased – the solid is still wet. SiO2 increased – the solid is contaminated with CaCO3
SiO2 decreased – some solid spilled. SiO2 decreased – some solid evaporated.
CaCO3 increased – the solid is contaminated with SiO2.
CaCO3 increased – the solid is still wet. CaCO3 decreased – the solid did not form completely.
CaCO3 decreased – the solid partially evaporated.
Explanation / Answer
NaCl increased because of it is wet
SiO2 increased because it is contaminated with CaCO3 as calcium silicate
CaCO3 decreased because some amount is combined with SiO2