MCQ practice

If 200. mL of 0.60 M MgCh(ag) is added to 400. mL of distilled water, what is the concentr the resulting solution? (Assume volumes are additive).

.2 M

A 40.0 mL sample of 0.25 M KOH is added to 60.0 mL of 0.15 M Ba(OH)2. What is the molar concentration of OH (aq) in the resulting solution? (Assume that the volumes are additive.)

.28 M

A 360. mg sample of aspirin, C,HgO4, (molar mass 180. g), is dissolved in enough water to produce 200. mL of solution. What is the molarity of aspirin in a 50. mL sample of this solution?

0.0100 M

how many mL of 10 M HCl are needed to prepare 500 mL of 2 m HCl

100. mL

the ph of a solution prepared by the addition of 10. mL or 0.002 M KOH(aq) to 10. mL of distilled water is closest to

11

the volume of distilled water that should be added to 10.0 mL or 6 M HCl(aq) in order to prepare a .5 M HCl(aq) solution is approximately

110 mL

Which of the following pieces of laboratory glassware should be used to most accurately measure out a 25.00 mL sample of a solution?

25 mL pipet

Then 70. milliliter of 3.0-molar NazCO3 is added to 30. milliliters of 1.0-molar NaHCO3 the resulting incentration of Na" * is

4.5 M

A student wishes to prepare 2.00 liters of 0.100-molar KI03 (molecular weight 214). The proper procedure is to weigh out

42.8 g of KIO3 and add H2O

Approximately what mass of CuSO4 • 5H20 (250 g mol) is required to prepare 250 mL of 0.10 M copper(1I) sulfate solution?

6.2 g

Of the following organic compounds, which is LEAST soluble in water at 208 K?

C6H12O6 glucose

11. Sodium chloride is LEAST soluble in which of the following liquids?

CCL4

On the basis of the solubility curves shown above, the greatest percentage of which compound can be recovered cooling a saturated solution of that compound from 90°C to 30°C?

KNO3

Which of the following techniques is most appropriate for the recovery of solid KNO3 from an aqueous solution of KNO3

evaporation to dryness

Based on the results of the paper chromatography experiment shown above, which of the following can be concluded about the dye?

it has a trinket attraction for the stationary phase than it had for the mobile phase

Based on concepts of polarity and hydrogen bonding, which of the following sequences correctly lists the compounds above in the order of their increasing solubility in water?

x<y<z