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WorksheetsCHM256 QUIZ 1 (Friday 22 March 2019)
Total questions: 10
Worksheet time: 29mins
Define the term quantitative analysis.
Determination of molecular weight of a given sample
Determinationof compositions/components/analytes present in a given sample
Determination of amount of compositions /components/analytes present in a given sample
Determination of chemical formula of a given sample
What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 Kg of water?
2.0 M
0.22 m
135 m
2.0m
A 2400.-gram sample of an aqueous solution contains 0.012 gram of NH3. What is the concentration of NH3 in the solution, expressed as parts per million?
5.0 ppm
15 ppm
20. ppm
50. ppm
What is the concentration of a solution, in parts
per million, if 0.02 gram of Na3PO4 is dissolved in 1000 grams of water?
20 ppm
2 ppm
0.2 ppm
0.02 ppm
An aqueous solution contains 300. parts per million of KOH. Determine the number of grams of KOH present in 1000. grams of this solution.
0.3 g
3.0 g
.000003 g
300 g
Both of these solutions have a volume of 30 mL. Which solution is more concentrated?
orange solution
green solution
they are equally concentrated
Calculate the mass of solid sodium sulfate (Na2SO4) for the preparation of 250 mL solution of 25 ppm Na+.
0.0152 g
0.0193 g
0.1520 g
0.0199 g
