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LINNE & RINGSRUD CHAPTER QUESTIONS > 7 LABORATORY MATHEMATICS AND SOLUTION PREPARATION > Flashcards

7 LABORATORY MATHEMATICS AND SOLUTION PREPARATION Flashcards

1
Q

How would 6.32 be rounded off to one less decimal place?
a. 6.32
b. 6.4
c. 7.0
d. 6.3

A

d. 6.3

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2
Q

How would 15.57 be rounded off to one less decimal place?
a. 15.6
b. 15.5
c. 16.0
d. 15.0

A

a. 15.6

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3
Q

How would 25.96 be rounded off to one less decimal place?
a. 26.0
b. 25.9
c. 25.6
d. 26.96

A

a. 26.0

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4
Q

The exponent 10^−2 represents:
a. 100
b. 1000
c. 0.1
d. 0.01

A

d. 0.01

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5
Q

A unique characteristic of specific gravity versus density is that specific gravity is:
a. The amount of matter per unit volume of a substance
b. That all substances have this property
c. That it represents size of substance
d. That it is applicable only to solutions

A

d. That it is applicable only to solutions

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6
Q

Molarity is:
a. The amount of one substance relative to the amounts
of other substances in the solution
b. Relative concentrations of the components of a mixture
c. The gram-molecular mass (or weight) of a compound per liter of solution
d. Expression of one amount relative to another amount

A

c. The gram-molecular mass (or weight) of a compound per liter of solution

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7
Q

Dilution is:
a. The amount of one substance relative to the amounts of other substances in the solution
b. Relative concentrations of the components of a mixture
c. The gram-molecular mass (or weight) of a compound per liter of solution
d. Expression of one amount relative to another amount

A

b. Relative concentrations of the components of a mixture

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8
Q

Three grams (3 g) of solute in 100mL of solvent equals _____% (w/v).
a. 0.3
b. 3
c. 30
d. 300

A

b. 3

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9
Q

Twenty grams (20 g) of solute dissolved in 1L of solvent equals _____% (w/v).
a. 0.2
b. 2
c. 20
d. 200

A

b. 2

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10
Q

If 6mL of liquid is placed in a volumetric flask and the volume is brought to 100mL total, the solution is what percent of liquid?
a. 0.6%
b. 6%
c. 60%
d. None of the above

A

b. 6%

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11
Q

How many grams of NaCl would be used to prepare 1000mL of a 5% (w/v) solution of NaCl?
a. 0.5 g
b. 5 g
c. 50 g
d. 500 g

A

c. 50 g

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12
Q

If there is 25 g of NaCl per liter of solution, what is the molarity?
a. 025M
b. 0.43M
c. 0.5M
d. 1.0M

A

b. 0.43M

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13
Q

How many grams of NaCl are needed to prepare 1000mL of a 0.5M solution of NaCl?
a. 5 g
b. 15 g
c. 29 g
d. 58.4 g

A

c. 29 g

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14
Q

How much calcium chloride (CaCl2) is needed to prepare 500mL of a 0.5M solution of CaCl2?
a. 27.7 g
b. 40.0 g
c. 57.8 g
d. 115.6 g

A

a. 27.7 g

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15
Q

What is the correct formula for calculating a percent (w/v) solution?
a. Grams of solute/Volume of solution×100
b. Grams of solute×Volume of solvent×100
c. Volume of solvent/Grams of solute×100
d. Grams of solute×Volume of solvent/100

A

a. Grams of solute/Volume of solution×100

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16
Q

If a solution contains 20 g of solute dissolved in 0.5L of water, what is the percentage of this solution?
a. 2%
b. 4%
c. 6%
d. 8%

A

b. 4%

17
Q

How is a 25% w/w solution prepared?
a. 0.25 g solute and 75 g solvent
b. 2.5 g solute and 97.5 g solvent
c. 25 g solute and 75 g solvent
d. 75 g solute and 25 g solvent

A

c. 25 g solute and 75 g solvent

18
Q

How many milliliters (mL) of bleach in an original bottle are needed to prepare a 10% solution?
a. 0.1mL bleach and 100mL water
b. 1.0mL bleach and 90mL water
c. 10mL bleach and 90mL water
d. Bleach is already a 10% solution in the original bottle

A

c. 10mL bleach and 90mL water

19
Q

What is the dilution factor if 0.5mL of serum is added to 2mL of diluent?
a. 0.5
b. 1.5
c. 2.5
d. 5

A

d. 5

20
Q

What volume of 25% alcohol is needed to prepare 500mL of 15% alcohol?
a. 30mL
b. 300mL
c. 350mL
d. 375mL

A

b. 300mL

21
Q

A ratio is:
a. The amount of one substance relative to the amounts of other substances in the solution
b. Relative concentrations of the components of a mixture
c. The gram-molecular mass (or weight) of a compound per liter of solution
d. Expression of one amount relative to another amount

A

d. Expression of one amount relative to another amount

22
Q

If only 25mL of a 9% saline solution is available in the laboratory, how many mL of 5% saline solution can be prepared using all available saline solution?
a. 4.5mL
b. 25.0mL
c. 45.0mL
d. 100mL

A

c. 45.0mL

23
Q

Concentration is:
a. The amount of one substance relative to the amounts of other substances in the solution
b. Relative concentrations of the components of a mixture
c. The gram-molecular mass (or weight) of a compound per liter of solution
d. Expression of one amount relative to another amount

A

a. The amount of one substance relative to the amounts of other substances in the solution

24
Q

To dilute a serum specimen 1:10, _____ parts of serum would be added to _____ parts distilled water.
a. 1, 10
b. 1, 9
c. 0.5, 4.5
d. Both b and c

A

b. 1, 9

25
Q

If 0.1mL of serum, 5mL of reagent, and 4.9mL of distilled water are mixed together, what is the dilution of the serum in the final solution?
a. 1:5
b. 1:10
c. 1:50
d. 1:100

A

d. 1:100

26
Q

If a glucose standard solution contains 10mg/dL of glucose, a 1:10 dilution of this standard contains how much glucose?
a. 0.01mg/dL
b. 0.1mg/dL
c. 1mg/dL
d. None of the above

A

c. 1mg/dL

27
Q

What is the dilution factor if 4mL of serum is added to 12mL of diluent?
a. 3
b. 4
c. 12
d. 15

A

b. 4

28
Q

Serum is diluted with an equal amount of diluent (such as tube #1, 1:2 and tube #2, 1:2). What is the concentration in tube #2 if the original concentration was 100mg/dL?
a. 12.5mg/dL
b. 25.0mg/dL
c. 50.0mg/dL
d. 75.0mg/dL

A

b. 25.0mg/dL

29
Q

If a total of 125mL of a 10% solution is diluted to 500mL in a 500-mL volumetric flask, what is the concentration of the resulting new solution?
a. 0.25%
b. 2.5%
c. 25%
d. None of the above

A

b. 2.5%

30
Q

You are asked to make a 1:2 dilution using 1.5mL of serum. How much diluent do you need to use?
a. 1.5mL
b. 3.0mL
c. 15mL
d. 30mL

A

a. 1.5mL

31
Q

Which of the following “recipes” gives you a 1:5 dilution?
a. 0.25mL serum+4.75mL of diluent
b. 2mL of serum+18mL of diluent
c. 0.25mL serum+1mL of diluent
d. 1.5mL serum+13.5mL of diluent

A

c. 0.25mL serum+1mL of diluent

32
Q

The dilution created by 1.5 mL serum + 13.5 mL of diluent is:
a. 1:20
b. 1:10
c. 1:100
d. 1:1000

A

b. 1:10

33
Q

If you make a five-tube twofold dilution using 2mL of serum, what is the concentration of serum in tube #4?
a. 0.125mL
b. 0.25mL
c. 1mL
d. 2mL

A

a. 0.125mL

LINNE & RINGSRUD CHAPTER QUESTIONS (18 decks)

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