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5 Concentrations, Dilutions, and Reconstitution Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Concentrations, Dilutions, and Reconstitution, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

In an ordinary dilution, adding solvent or diluent lowers the concentration while keeping the amount of ingredient constant.

  1. A

    True

  2. B

    False

02
Choose one
1 point

A solution is labeled 1:1,0001:1{,}000 w/v. What is its concentration expressed in mg/mL\text{mg/mL}?

  1. A

    0.1 mg/mL0.1\text{ mg/mL}

  2. B

    1 mg/mL1\text{ mg/mL}

  3. C

    10 mg/mL10\text{ mg/mL}

  4. D

    1 g/mL1\text{ g/mL}

03
Choose all
1 point

Select all statements that correctly interpret the percentage concentration shown.

  1. A

    2%2\% w/v means 2 g2\text{ g} of ingredient in each 100 mL100\text{ mL} of final solution.

  2. B

    2%2\% w/w means 2 g2\text{ g} of ingredient in each 100 g100\text{ g} of final mixture.

  3. C

    5%5\% v/v means 5 g5\text{ g} of ingredient in each 100 mL100\text{ mL} of final solution.

  4. D

    5%5\% v/v means 5 mL5\text{ mL} of ingredient in each 100 mL100\text{ mL} of final solution.

04
Choose one
1 point

A solution is 2%2\% w/v. What is its concentration in mg/mL\text{mg/mL}?

  1. A

    2 mg/mL2\text{ mg/mL}

  2. B

    10 mg/mL10\text{ mg/mL}

  3. C

    20 mg/mL20\text{ mg/mL}

  4. D

    200 mg/mL200\text{ mg/mL}

05
Written response
1 point

Write the ordinary dilution equation using C1C_1, V1V_1, C2C_2, and V2V_2, where the subscripts 1 and 2 refer to starting and final values, respectively.

06
Choose one
1 point

A preparation has a concentration of 20 mg/mL20\text{ mg/mL}. How much ingredient is contained in 15 mL15\text{ mL}?

  1. A

    30 mg30\text{ mg}

  2. B

    200 mg200\text{ mg}

  3. C

    300 mg300\text{ mg}

  4. D

    3,000 mg3{,}000\text{ mg}

07
Fill in the blank
1 point

To prepare 100 mL100\text{ mL} at 10 mg/mL10\text{ mg/mL} from a 40 mg/mL40\text{ mg/mL} stock, measure mL of stock. Enter the volume as a number of milliliters.

08
Written response
1 point

A reconstituted product has a labeled final concentration of 250 mg/mL250\text{ mg/mL}. What volume contains 375 mg375\text{ mg}? Enter the numerical volume in mL.

09
Fill in the blank
1 point

Before using C1V1=C2V2C_1V_1=C_2V_2, ensure the concentration units each other and the volume units match each other.

10
Choose all
1 point

A technician measures 25 mL25\text{ mL} of stock and prepares a dilution to a final volume of 100 mL100\text{ mL}. Select all statements that correctly guide the preparation.

  1. A

    Bring the mixture to the specified final volume of 100 mL100\text{ mL}.

  2. B

    Always add exactly 75 mL75\text{ mL} of diluent because 100−25=75100-25=75.

  3. C

    Treat 75 mL75\text{ mL} as an approximate amount of diluent only when the volumes are additive.

  4. D

    Check that the final volume is at least as large as the stock volume.

11
True or false
1 point

After reconstitution, the final solution volume is not necessarily equal to the volume of diluent added.

  1. A

    True

  2. B

    False

12
Open ended
1 point

A powder product is to be reconstituted, and a dose must then be withdrawn. Explain which information must come from product-specific instructions and how the volume to withdraw is calculated once the final concentration is known. Also explain why the withdrawal calculation does not determine the amount of diluent to add.

13
Choose one
1 point

When reconstituting a dry product, how should the amount of diluent to add be determined?

  1. A

    Add diluent until the amount added equals the desired final solution volume.

  2. B

    Follow the specified product instructions for the diluent and amount to add.

  3. C

    Choose the amount of diluent from the withdrawal volume calculation.

  4. D

    Assume that the volume of diluent added equals the final solution volume.

14
Choose one
1 point

Which approach best follows the guidance for numerical precision when completing a concentration or dilution calculation?

  1. A

    Round every intermediate value to the nearest whole number.

  2. B

    Keep all intermediate digits and never round the final measurement.

  3. C

    Retain sufficient precision during calculation, then round the final measurement as directed.

  4. D

    Always round the final measurement to one decimal place.

15
Choose one
1 point

What does a concentration of 3%3\% w/v mean?

  1. A

    3 g in 100 g of final mixture

  2. B

    3 g in 100 mL of final solution

  3. C

    3 mL in 100 mL of final solution

  4. D

    3 g in 1,000 mL of final solution

16
True or false
1 point

True or false: If you mix 40 mL40\text{ mL} of stock solution with 60 mL60\text{ mL} of diluent, the final volume is always exactly 100 mL100\text{ mL}.

  1. A

    True

  2. B

    False

17
Choose one
1 point

Convert a 1.8%1.8\% w/v solution to mg/mL\text{mg/mL}.

  1. A

    1.8 mg/mL1.8\text{ mg/mL}

  2. B

    10.8 mg/mL10.8\text{ mg/mL}

  3. C

    18 mg/mL18\text{ mg/mL}

  4. D

    180 mg/mL180\text{ mg/mL}

18
Written response
1 point

A solution is labeled 1:2,5001:2{,}500 w/v, meaning 1 g1\text{ g} of ingredient per 2,500 mL2{,}500\text{ mL} of final preparation. What is its concentration in mg/mL\text{mg/mL}?

19
Choose one
1 point

A preparation contains 16 mg/mL16\text{ mg/mL} of ingredient. How much ingredient is present in 7.5 mL7.5\text{ mL}?

  1. A

    120 mg120\text{ mg}

  2. B

    23.5 mg23.5\text{ mg}

  3. C

    2.13 mg2.13\text{ mg}

  4. D

    120 mL120\text{ mL}

20
Written response
1 point

How many milliliters of a 70 mg/mL70\text{ mg/mL} preparation contain 210 mg210\text{ mg} of ingredient?