Question 1

The label on a jar of jam says it contains 13 g of sucrose per tablespoon (15 mL).What is the molarity of sucrose in the jam? [Molar mass: sucrose,342.3 g/mol]

Accepted Answer

The answer of The label on a jar of jam...

Question 2

An unopened soda bottle at 25°C contains CO₂ gas at 6.2 atm.Calculate the equilibrium concentration of CO₂ in the unopened soda bottle.[ $\mathrm { K } _ { \mathrm { CO } _ { 2 } }$ = 3.1 × 10^-2mol/(L•atm)]

Accepted Answer

The equilibrium concentration of CO2 in the soda can be calculated using Henry's law, which states that the solubility of a gas in a liquid at a given temperature is directly proportional to the pressure of the gas above the liquid. The formula for Henry's law is given by: $$C = kP$$ where $C$ is the concentration of the gas in the liquid, $k$ is the Henry's law constant, and $P$ is the partial pressure of the gas. Given that $k = 3.1 \times 10^{-2}$ mol/(L•atm) and $P = 6.2$ atm, the concentration $C$ can be calculated as: $$C = (3.1 \times 10^{-2}) \times 6.2 = 0.1922 \approx 0.19 \text{ mol/L}$$

Question 3

What is the boiling point of a 1.5 m solution of NaCl? [k_b= 0.52°C/m]

Accepted Answer

The boiling point elevation can be calculated using the formula ΔT_b = i * m * k_b, where i is the van't Hoff factor (2 for NaCl), m is the molality (1.5 m), and k_b is the ebullioscopic constant (0.52°C/m). ΔT_b = 2 * 1.5 * 0.52 = 1.56°C. Adding this to the normal boiling point of water (100°C) gives 101.56°C.

Question 4

Cardiac arrest victims are sometimes treated by injection of a calcium chloride solution directly into the heart muscle.If 2.0 mL of a 5.0% (m/V)CaCl₂ solution is administered to a patient,what mass of CaCl₂ was provided?

Accepted Answer

The mass of CaCl2 is calculated by multiplying the volume of the solution (2.0 mL) by the concentration (5.0% m/V), which gives 0.10 g.

Question 5

A solution in equilibrium with undissolved solute is said to be unsaturated.

Accepted Answer

A solution in equilibrium with undissolved solute is said to be saturated, meaning it has dissolved the maximum amount of solute at a given temperature.

Question 6

A chemist needs 0.725 moles of acetic acid for a particular reaction.What volume of a 1.50 M acetic acid solution is needed to provide this amount?

Accepted Answer

The answer of A chemist needs 0.725 moles of acetic...

Question 7

If a solvent is colorless,all of its true solutions will also be colorless.

Accepted Answer

The color of a solution depends not only on the solvent but also on the solute. If the solute is colored, it can impart its color to the solution, even if the solvent is colorless.

Question 8

Which statement is FALSE?

Accepted Answer

Ionic compounds are typically soluble in water, especially those like NaCl, which is a common example. This solubility is due to the polar nature of water molecules, which can surround and separate the ions in an ionic compound, leading to dissolution.

Question 9

The solubility of KBr at 20°C is 60 g/100 g H₂O.Increasing the temperature of the solution will likely increase the solubility of KBr.

Accepted Answer

Generally, for most solid solutes, the solubility in water increases as the temperature of the solution increases.

Question 10

Which statement concerning solutions is FALSE?

Accepted Answer

Colloidal suspensions are not considered true solutions because they consist of larger particles that do not dissolve but remain dispersed in a medium, unlike the particles in a solution that are completely dissolved at the molecular or ionic level, resulting in a homogeneous mixture.

Question 11

Which statement concerning solution concentration is TRUE?

Accepted Answer

The correct answer is D because in a solution of Ba(OH)2, each formula unit dissociates into one Ba^2+ ion and two OH^- ions. Therefore, a 0.10 M solution of Ba(OH)2 will result in a 0.20 M concentration of OH^- ions due to the stoichiometry of the dissociation.

Question 12

What is the molarity of a solution prepared by diluting 10.0 mL of 18.0 M HCl with enough water to make 500.0 mL of solution?

Accepted Answer

The molarity of the diluted solution is calculated using the dilution formula M1V1 = M2V2, where M1 and V1 are the molarity and volume of the concentrated solution, and M2 and V2 are the molarity and volume of the diluted solution. Substituting the given values: (18.0 M)(10.0 mL) = (M2)(500.0 mL), solving for M2 gives M2 = (18.0 M)(10.0 mL) / (500.0 mL) = 0.360 M.

Question 13

The solid material that separates from solution when its solubility is exceeded is called a precipitate.

Accepted Answer

When a solution reaches its solubility limit and no more solute can dissolve, any additional solute will form a solid material that separates from the solution, which is known as a precipitate.

Question 14

What is the molarity of a solution that contains 4.50 mol of NaF dissolved in 750.0 mL of solution?

Accepted Answer

Molarity is calculated by dividing the number of moles of solute by the volume of the solution in liters. Here, 4.50 mol of NaF is dissolved in 0.750 L (750.0 mL converted to liters), so the molarity is 4.50 mol / 0.750 L = 6.00 M.

Question 15

An unknown amount of water is added to 75 mL of a 3.5 M sodium chloride solution.What can be said for certain about the concentration of the solution that results?

Accepted Answer

Adding water to a solution dilutes it, which decreases its concentration from the original 3.5 M.

Question 16

In normal room lighting,the eye cannot distinguish a true solution from a colloidal one.

Accepted Answer

In normal room lighting, both true solutions and colloidal solutions appear homogeneous to the naked eye, making it difficult to distinguish between the two without specialized equipment or techniques.

Question 17

One liter of alcohol combined with one liter of water does NOT produce two liters of solution.

Accepted Answer

When alcohol and water are mixed, they undergo a process called volume contraction, where the total volume of the solution is less than the sum of the individual volumes due to the molecules fitting more efficiently into the space.

Question 18

An alloy,such as brass,is an example of a solution in the solid state.

Accepted Answer

An alloy like brass is considered a solid solution because it consists of two or more metals mixed uniformly at the atomic level, similar to how solutes are dissolved in solvents in liquid solutions.

Question 19

Which statement concerning solutions is FALSE?

Accepted Answer

Solutions can be in any state of matter - solid, liquid, or gas, not just liquid. For example, air is a gaseous solution, and alloys are solid solutions.

Question 20

A patient requires 100.0 g of glucose in the next 12 hours.What volume of a 5.0% (m/V)glucose solution should be administered?

Accepted Answer

A 5.0% (m/V) glucose solution means 5.0 g of glucose is present in every 100 mL of solution. To get 100.0 g of glucose, you would need 2000 mL or 2.0 L of the solution.

Quiz 6: Solutions

The label on a jar of jam says it contains 13 g of sucrose per tablespoon (15 mL) .What is the molarity of sucrose in the jam? [Molar mass: sucrose,342.3 g/mol]

An unopened soda bottle at 25°C contains CO₂ gas at 6.2 atm.Calculate the equilibrium concentration of CO₂ in the unopened soda bottle.[ $\mathrm { K } _ { \mathrm { CO } _ { 2 } }$ = 3.1 × 10^-2mol/(L•atm) ]

What is the boiling point of a 1.5 m solution of NaCl? [k_b= 0.52°C/m]

Cardiac arrest victims are sometimes treated by injection of a calcium chloride solution directly into the heart muscle.If 2.0 mL of a 5.0% (m/V) CaCl₂ solution is administered to a patient,what mass of CaCl₂ was provided?

A solution in equilibrium with undissolved solute is said to be unsaturated.

A chemist needs 0.725 moles of acetic acid for a particular reaction.What volume of a 1.50 M acetic acid solution is needed to provide this amount?

If a solvent is colorless,all of its true solutions will also be colorless.

Which statement is FALSE?

The solubility of KBr at 20°C is 60 g/100 g H₂O.Increasing the temperature of the solution will likely increase the solubility of KBr.

Which statement concerning solutions is FALSE?

Which statement concerning solution concentration is TRUE?

What is the molarity of a solution prepared by diluting 10.0 mL of 18.0 M HCl with enough water to make 500.0 mL of solution?

The solid material that separates from solution when its solubility is exceeded is called a precipitate.

What is the molarity of a solution that contains 4.50 mol of NaF dissolved in 750.0 mL of solution?

An unknown amount of water is added to 75 mL of a 3.5 M sodium chloride solution.What can be said for certain about the concentration of the solution that results?

In normal room lighting,the eye cannot distinguish a true solution from a colloidal one.

One liter of alcohol combined with one liter of water does NOT produce two liters of solution.

An alloy,such as brass,is an example of a solution in the solid state.

Which statement concerning solutions is FALSE?

A patient requires 100.0 g of glucose in the next 12 hours.What volume of a 5.0% (m/V) glucose solution should be administered?

Quiz 6: Solutions

The label on a jar of jam says it contains 13 g of sucrose per tablespoon (15 mL) .What is the molarity of sucrose in the jam? [Molar mass: sucrose,342.3 g/mol]

An unopened soda bottle at 25°C contains CO2 gas at 6.2 atm.Calculate the equilibrium concentration of CO2 in the unopened soda bottle.[ KCO2\mathrm { K } _ { \mathrm { CO } _ { 2 } }KCO2​​ = 3.1 × 10-2 mol/(L•atm) ]

What is the boiling point of a 1.5 m solution of NaCl? [kb = 0.52°C/m]

Cardiac arrest victims are sometimes treated by injection of a calcium chloride solution directly into the heart muscle.If 2.0 mL of a 5.0% (m/V) CaCl2 solution is administered to a patient,what mass of CaCl2 was provided?

A solution in equilibrium with undissolved solute is said to be unsaturated.

A chemist needs 0.725 moles of acetic acid for a particular reaction.What volume of a 1.50 M acetic acid solution is needed to provide this amount?

If a solvent is colorless,all of its true solutions will also be colorless.

Which statement is FALSE?

The solubility of KBr at 20°C is 60 g/100 g H2O.Increasing the temperature of the solution will likely increase the solubility of KBr.

Which statement concerning solutions is FALSE?

Which statement concerning solution concentration is TRUE?

What is the molarity of a solution prepared by diluting 10.0 mL of 18.0 M HCl with enough water to make 500.0 mL of solution?

The solid material that separates from solution when its solubility is exceeded is called a precipitate.

What is the molarity of a solution that contains 4.50 mol of NaF dissolved in 750.0 mL of solution?

An unknown amount of water is added to 75 mL of a 3.5 M sodium chloride solution.What can be said for certain about the concentration of the solution that results?

In normal room lighting,the eye cannot distinguish a true solution from a colloidal one.

One liter of alcohol combined with one liter of water does NOT produce two liters of solution.

An alloy,such as brass,is an example of a solution in the solid state.

Which statement concerning solutions is FALSE?

A patient requires 100.0 g of glucose in the next 12 hours.What volume of a 5.0% (m/V) glucose solution should be administered?

An unopened soda bottle at 25°C contains CO₂ gas at 6.2 atm.Calculate the equilibrium concentration of CO₂ in the unopened soda bottle.[ $\mathrm { K } _ { \mathrm { CO } _ { 2 } }$ = 3.1 × 10^-2mol/(L•atm) ]

What is the boiling point of a 1.5 m solution of NaCl? [k_b= 0.52°C/m]

Cardiac arrest victims are sometimes treated by injection of a calcium chloride solution directly into the heart muscle.If 2.0 mL of a 5.0% (m/V) CaCl₂ solution is administered to a patient,what mass of CaCl₂ was provided?

The solubility of KBr at 20°C is 60 g/100 g H₂O.Increasing the temperature of the solution will likely increase the solubility of KBr.