Question 1

When a concentration is expressed in terms of molarity,what does it tell us about the solution?

Accepted Answer

A)  The number of moles of a solute present in 1 liter of solution 
B)  The number of moles of a solute present in 1,000 grams of solution 
C)  The number of osmoles of a solute present in 1 liter of solution 
D)  The number of osmoles of a solute present in 1,000 grams of solution A

Question 2

A solution is composed of 1% sodium chloride and 0.5% potassium chloride in distilled water.Which substance(s)would be considered the solute?

Accepted Answer

A)  Potassium chloride 
B)  Sodium chloride 
C)  Potassium chloride and sodium chloride 
D)  Water C

Question 3

The concentration of a sodium chloride (NaCl)solution is defined as 10% NaCl (w/w).What does this tell us about the amount of NaCl in the solution?

Accepted Answer

A)  There are 10 grams of NaCl in every 10% of solution. 
B)  There are 10 grams of NaCl in every 100 grams of solution. 
C)  There are 10 grams of NaCl in every 100 mL of solution. 
D)  There are 10 grams of NaCl in every 100 ounces of solution. B

Question 4

Consider the following equation: concentration of glucose = $ \frac{8.5 \text { moles glucose }}{0.1 \text { kilogram water }} $
What are the units of the value calculated by this equation?

Accepted Answer

A)  Molal 
B)  Molar 
C)  v/v 
D)  w/v

Question 5

What is the specific gravity of a solution?

Accepted Answer

A)  The ratio of the concentration of a solute to the concentration of the solvent at 37°C 
B)  The ratio of the concentration of a solute to the density of water at 4°C 
C)  The ratio of the density of a solute to the density of the solvent at 37°C 
D)  The ratio of the density of a solution to the density of water at 4°C

Question 6

The concentration of an aqueous glucose solution is noted as 25% glucose (w/v).What does this tell us about the amount of glucose in the solution?

Accepted Answer

A)  There are 0.25 grams of glucose in every 100 mL of solution. 
B)  There are 2.5 grams of glucose in every 100 mL of solution. 
C)  There are 25 grams of glucose in every 100 mL of solution. 
D)  There are 250 grams of glucose in every 100 mL of solution.

Question 7

What does the term "equivalent weight" mean?

Accepted Answer

A)  The amount of a solute that is equivalent in mass to 1 mole of the intended solvent 
B)  The amount of a substance that contains, theoretically combines with, or theoretically replaces 1 mole of hydrogen atoms 
C)  The molality of a solute that contains the same number of atoms as 100 grams of solvent 
D)  The molarity of a solute that is necessary to completely saturate 100 mL of solvent

Question 8

What is pH a measure of?

Accepted Answer

A)  The concentration of hydrogen ions in a solution 
B)  The normality of a solution containing 10 grams hydrogen ions in water 
C)  The reaction speed of hydrogen ions with bases in a solution 
D)  The specific gravity of 10 grams of hydrogen ions in water

Question 9

What is the rule for determining an equivalent for calculating the normality of a base or salt solution?

Accepted Answer

A)  An equivalent is the number of hydrogen atoms present in the base or salt. 
B)  An equivalent is the number of hydrogen ions with which it can theoretically combine. 
C)  An equivalent is the total number of hydroxide (OH⁻) groups divided by the number of hydrogen atoms present. 
D)  An equivalent is the total number of positively charged ions present in the molecule.

Question 10

A solution in which the solvent is water is referred to as

Accepted Answer

A)  aqueous. 
B)  dissolved. 
C)  liquid. 
D)  soluble.

Question 11

A solution has pH 7.Another solute is added to the solution and the pH changes to 6.What does this tell us about the concentration of hydrogen ions in the solution?

Accepted Answer

A)  The hydrogen ion concentration decreased by a factor of 10 
B)  The hydrogen ion concentration decreased by a factor of 100 
C)  The hydrogen ion concentration increased by a factor of 10 
D)  The hydrogen ion concentration increased by a factor of 100

Question 12

If a solution is held at a constant temperature of 25°C,at what pH would it be considered neutral?

Accepted Answer

A)  1 
B)  6 
C)  7 
D)  10

Question 13

A solution of aqueous ferric chloride has a concentration of 15 ppm.What does this tell us about the amount of ferric chloride in the solution?

Accepted Answer

A)  There are 15 grams of ferric chloride in every 1,000,000 grams of solution. 
B)  There are 15 grams of ferric chloride in every 1,000,000 mL of solution. 
C)  There are 15 mL of ferric chloride in every 1,000,000 mL of solution. 
D)  Both A and B are correct.

Question 14

A solution of sodium chloride (NaCl)is calculated to be 0.5 M at 37°C.The solution was placed in an 18°C refrigerator for 24 hours and the molarity was recalculated.What would you expect the molarity of the solution to be?

Accepted Answer

A)  0.5 M 
B)  Greater than 0.5 M 
C)  Less than 0.5 M 
D)  It cannot be determined from the information given.

Question 15

What are the units on a pH value?

Accepted Answer

A)  g/mL 
B)  M/L 
C)  mol/L 
D)  None of the above

Question 16

What is the risk of reporting an incorrect concentration for a patient sample?

Accepted Answer

A)  Administration of an inappropriate drug 
B)  Misdiagnosis of an illness 
C)  Both of the above 
D)  Neither of the above

Question 17

Which of the following best defines the term "solution"?

Accepted Answer

A)  A combination of two or more different chemical elements in which the atoms of the different elements are held together by chemical bonds 
B)  A heterogeneous combination of two or more substances where the properties of each individual substance are absorbed by the other(s) 
C)  A homogeneous mixture of two or more substances that do not chemically react with each other 
D)  A mixture of two or more substances that results in a change in the molecular composition of each substance

Question 18

A vial of 3 mg silver chloride (AgCl)is poured into a flask containing 100 mL water and mixed.After 24 hours,2.9 mg of silver chloride remains as a solid at the bottom of the flask.Which of the following terms best describes the ability of silver chloride to dissolve in water?

Accepted Answer

A)  Insoluble 
B)  Partly soluble 
C)  Soluble 
D)  Sparingly soluble

Question 19

What is the number of equivalents of the base PO43-?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  8

Exam 5: Solutions and Concentrations

When a concentration is expressed in terms of molarity,what does it tell us about the solution?

A solution is composed of 1% sodium chloride and 0.5% potassium chloride in distilled water.Which substance(s) would be considered the solute?

The concentration of a sodium chloride (NaCl) solution is defined as 10% NaCl (w/w) .What does this tell us about the amount of NaCl in the solution?

Consider the following equation: concentration of glucose = $\frac{8.5 \text { moles glucose }}{0.1 \text { kilogram water }}$ What are the units of the value calculated by this equation?

What is the specific gravity of a solution?

The concentration of an aqueous glucose solution is noted as 25% glucose (w/v) .What does this tell us about the amount of glucose in the solution?

What does the term "equivalent weight" mean?

What is pH a measure of?

What is the rule for determining an equivalent for calculating the normality of a base or salt solution?

A solution in which the solvent is water is referred to as

A solution has pH 7.Another solute is added to the solution and the pH changes to 6.What does this tell us about the concentration of hydrogen ions in the solution?

If a solution is held at a constant temperature of 25°C,at what pH would it be considered neutral?

A solution of aqueous ferric chloride has a concentration of 15 ppm.What does this tell us about the amount of ferric chloride in the solution?

A solution of sodium chloride (NaCl) is calculated to be 0.5 M at 37°C.The solution was placed in an 18°C refrigerator for 24 hours and the molarity was recalculated.What would you expect the molarity of the solution to be?

What are the units on a pH value?

What is the risk of reporting an incorrect concentration for a patient sample?

Which of the following best defines the term "solution"?

A vial of 3 mg silver chloride (AgCl) is poured into a flask containing 100 mL water and mixed.After 24 hours,2.9 mg of silver chloride remains as a solid at the bottom of the flask.Which of the following terms best describes the ability of silver chloride to dissolve in water?

What is the number of equivalents of the base PO₄^3-?

Exam 5: Solutions and Concentrations

When a concentration is expressed in terms of molarity,what does it tell us about the solution?

A solution is composed of 1% sodium chloride and 0.5% potassium chloride in distilled water.Which substance(s) would be considered the solute?

The concentration of a sodium chloride (NaCl) solution is defined as 10% NaCl (w/w) .What does this tell us about the amount of NaCl in the solution?

Consider the following equation: concentration of glucose = 8.5 moles glucose 0.1 kilogram water \frac{8.5 \text { moles glucose }}{0.1 \text { kilogram water }} 0.1 kilogram water 8.5 moles glucose ​ What are the units of the value calculated by this equation?

What is the specific gravity of a solution?

The concentration of an aqueous glucose solution is noted as 25% glucose (w/v) .What does this tell us about the amount of glucose in the solution?

What does the term "equivalent weight" mean?

What is pH a measure of?

What is the rule for determining an equivalent for calculating the normality of a base or salt solution?

A solution in which the solvent is water is referred to as

A solution has pH 7.Another solute is added to the solution and the pH changes to 6.What does this tell us about the concentration of hydrogen ions in the solution?

If a solution is held at a constant temperature of 25°C,at what pH would it be considered neutral?

A solution of aqueous ferric chloride has a concentration of 15 ppm.What does this tell us about the amount of ferric chloride in the solution?

A solution of sodium chloride (NaCl) is calculated to be 0.5 M at 37°C.The solution was placed in an 18°C refrigerator for 24 hours and the molarity was recalculated.What would you expect the molarity of the solution to be?

What are the units on a pH value?

What is the risk of reporting an incorrect concentration for a patient sample?

Which of the following best defines the term "solution"?

A vial of 3 mg silver chloride (AgCl) is poured into a flask containing 100 mL water and mixed.After 24 hours,2.9 mg of silver chloride remains as a solid at the bottom of the flask.Which of the following terms best describes the ability of silver chloride to dissolve in water?

What is the number of equivalents of the base PO43-?

Consider the following equation: concentration of glucose = $\frac{8.5 \text { moles glucose }}{0.1 \text { kilogram water }}$ What are the units of the value calculated by this equation?

What is the number of equivalents of the base PO₄^3-?