Assessment Questions: 16 results 
Solutions : SolnPrepByDilution (10 Variations) For the analysis of trace metals it is necessary to prepare solutions of very low concentrations from a stock solution of higher concentration using a micropipet and a volumetric flask. What volume of a 0.0010 M solution of Zn(NO_{3})_{2} (aq) would be required to prepare a 5.0 nM solution of Zn^{2+} in a 250mL flask?
Solutions / Solvents 
Chemometrics

Solutions : FreezePtDepression (20 Variations) It takes 6.86 kg of ethylene glycol (antifreeze) to decrease the freezing point of 6.50 kg of water to 25.0^{o}F (31.7^{o}C). How much sodium chloride (NaCl) would it take to decrease the freezing point of 6.50 kg of water to 25.0^{o}F? (Assuming all the salt will dissolve in that amount of water.)
Solutions / Solvents

Solutions : GeneralSolutions (10 Variations) You have 500.0mL of 0.100M aqueous MgBr_{2}. Which of the following statements are true?
Solutions / Solvents

Solutions : SolnPrepProcedure (10 Variations) You want to prepare 250mL of a 0.0150M solution of KCl. Which of the following procedures would give you the best results?
Solutions / Solvents

Solutions : SolutionNanoPics (4 Variations) The drawings below represent flasks of aqueous solutions. Each pink dot represents a dissolved solute particle. Which of the following solutions is most concentrated?



500 mL Solution A

500 mL Solution B

500 mL Solution C




250 mL Solution D

250 mL Solution E

250 mL Solution F

Solutions / Solvents

Solutions : IonConcentration (4 Variations) Which of the following solutions has the greatest concentration of Na^{+} ions?
Solutions / Solvents 
Chemometrics

Solutions : MassSoluteInSoln (10 Variations) What is the mass of the solute in 500mL of 0.341M ammonium chloride?
Solutions / Solvents 
Chemometrics

Solutions : RelativeConc (4 Variations) What are the relative concentrations of the ions in 0.10 M aqueous sulfuric acid?
Solutions / Solvents 
Stoichiometry

Solutions : ReverseOsmosis (20 Variations) You are given a water sample that contains ammonium chloride (NH_{4}Cl). You determine the concentration of the salt to be 0.500 M and decide to purify the water using reverse osmosis. What is the minimum pressure that must be applied at 30.0^{o}C to force the water through the membrane?
Solutions / Solvents 
Transport Properties

Solutions : SolnConcAfterMixing (4 Variations) 10 mL of 0.1 M BaCl_{2}(aq) is mixed with 10 mL of 0.1 M AgNO_{3}(aq). What are the concentrations of the ions in the final mixture?
Solutions / Solvents 
Chemometrics

Solutions : SolnPrepByMass (4 Variations) You are required to prepare 5 L of a solution containing 1.000 x 10^{3} mol/L of Cu^{2+}(aq). Which of the following procedures would produce an appropriate solution?
Solutions / Solvents 
Chemometrics

Solutions : ConvertConcUnits (10 Variations) The maximum concentration of arsenic in drinking water that is allowed by the EPA is 0.050 mg/L. Express this as a weight percent. (You can assume the density of the water solution is 1.0g/mL.)
Solutions / Solvents 
Nomenclature / Units / Symbols 
Chemometrics

Solutions : GramsToMolalSoln (20 Variations) How many grams of citric acid need to be added to 750 ml of ethanol to make a 0.50 m solution?

Density (g/ml)

Molecular Weight (g/mol)

Citric acid

1.665

192.14

Ethanol

0.7893

46.07

Solutions / Solvents 
Nomenclature / Units / Symbols 
Chemometrics

Solutions : MixturesMolcPics (11 Variations) Which of the following combinations of substances corresponds to the molecular scale diagram shown below?
Solutions / Solvents 
Noncovalent Interactions 
Precipitation / Solubility

Solutions : WtPercentToMolarity (4 Variations)
A common concentration unit used commercially is percent weight per volume (%W/V) which is the number of grams of solute in 100 mL of solution. A bottle of vinegar contains 5 %W/V acetic acid (CH_{3}COOH). What is the molar concentration of acetic acid in the vinegar?
Solutions / Solvents 
Nomenclature / Units / Symbols 
Chemometrics

Solutions : CalcMolarityFromPPT (10 Variations) You are given a water sample to analyze from a lake contaminated with lead. It takes 24 mL of 0.020 M NaCl to exactly precipitate the Pb^{2+} ions from 61 mL of the water sample. What is the concentration of Pb^{2+} ions in the water? Pb^{2+}(aq) + 2NaCl(aq)PbCl_{2}(s) + 2Na^{+}(aq)
Solutions / Solvents 
Nomenclature / Units / Symbols 
Chemometrics
