Question 1

A solution is made from dissolving 102 grams of potassium carbonate in 100 grams of water. What is the solvent in this solute in the solution and explain.

Accepted Answer

The answer of A solution is made from dissolving 102...

Question 2

Determine the mole fraction of a solution made from mixing 39 grams of sugar (MM = 180 g/mol) with 310 grams of water.

Accepted Answer

The answer of Determine the mole fraction of a solution...

Question 3

Industrial grade concentrated HCl is known as muriatic acid and is 31.45% by mass HCl in water. What is the molality of this solution?

Accepted Answer

The answer of Industrial grade concentrated HCl is known as...

Question 4

The molecule drawn below is Vitamin D, Calciferol. Would you predict this molecule to be more soluble in water or body fat and explain why?

Accepted Answer

The answer of The molecule drawn below is Vitamin D,...

Question 5

The molecule drawn below is Vitamin B1, thiamine. Would you predict this molecule to be more soluble in water or body fat and explain why?

Accepted Answer

The answer of The molecule drawn below is Vitamin B1,...

Question 6

Pesticides have been found to accumulate and affect the growth of animals higher in food chain. Can you give some rational for this, including discussion of the solubility of pesticides in general?

Accepted Answer

The answer of Pesticides have been found to accumulate and...

Question 7

When both solid Na metal and solid NaCl are added to water a colourless solution develops. How are these processes different?

Accepted Answer

The answer of When both solid Na metal and solid...

Question 8

Consider a can containing 355 mL of a carbonated soft drink at 0°C under 2.2 atm CO₂pressure. What is the concentration of CO₂in the soda, assuming that K_H = 7.8 x 10^-2 M/atm?

Accepted Answer

The answer of Consider a can containing 355 mL of...

Question 9

The problem with hot water heaters in some parts of the country is that a solid forms inside of them, CaCO₃. Predict if the solvation process for CaCO₃ is endothermic or exothermic and if it is more soluble or less soluble at colder temperatures.

Accepted Answer

The answer of The problem with hot water heaters in...

Question 10

Fahrenheit developed his temperature scale where he set zero degrees as the freezing point for a salt-water solution. What is the concentration of this salt solution in molality (assume NaCl in water)? (T_f = 1.86 ˚C/m)

Accepted Answer

The answer of Fahrenheit developed his temperature scale where he...

Question 11

Automobile coolant is about 50% by mass ethylene glycol in water. The line structure of ethylene glycol is shown below: What is the normal boiling point of this solution if K_b for water = 0.512 ˚Cm^-1?

Accepted Answer

The answer of Automobile coolant is about 50% by mass...

Question 12

If you have ever made homemade ice cream you would know that you need to add salt to the ice surrounding the container that you make the ice cream in. By adding the salt to the ice it lowers the temperature of the ice. Explain what is happening to the salt when added to the ice and what you can say about the heat of solvation for sodium chloride.

Accepted Answer

The answer of If you have ever made homemade ice...

Question 13

When 0.64 g of adrenaline is dissolved in 36.0 g benzene (K_f = 5.12 °C), the freezing point is lowered by 0.50°C. Determine the molecular mass of adrenaline.

Accepted Answer

The answer of When 0.64 g of adrenaline is dissolved...

Question 14

A 7.85 g sample of a compound with an empirical formula C₁H₁ is dissolved in 172 g of benzene. The freezing point of the solution is 1.50$\degree$C below that of pure benzene. Assuming that the compound does not dissociate, what is the molar mass and molecular formula of this compound? The freezing point depression constant for benzene is K_f = 5.12 $\degree$C/m.

Accepted Answer

The answer of A 7.85 g sample of a compound...

Question 15

To what minimum temperature would a radiator be protected if equal volumes of ethylene glycol (permanent antifreeze) (density 1.11 g/mL) and water were mixed? Assume that ethylene glycol does not dissociate and has a formula, C₂H₆O₂. (K_f = 1.85 ˚Cm^-1).

Accepted Answer

The answer of To what minimum temperature would a radiator...

Question 16

What is the freezing point of a solution made from mixing 39 grams of sugar (MM = 180 g/mol) with 310 grams of water? (K_f = 1.85 ˚Cm^-1)?

Accepted Answer

The answer of What is the freezing point of a...

Question 17

Lysozyme is an enzyme found in tears whose function is to break down bacterial cell walls thus killing the bacteria and protecting the eye from infection. A solution made which contains 0.100 g of lysozyme in 150 g of water ($\rho$ = 1.00 g/mL) at 25°C has an osmotic pressure of 8.9 Torr. What is the molar mass of this enzyme?

Accepted Answer

The answer of Lysozyme is an enzyme found in tears...

Question 18

Draw a molecular picture of a surfactant on a waxed surface, like soapy water on a freshly waxed car.

Accepted Answer

The answer of Draw a molecular picture of a surfactant...

Question 19

Ben Franklin determined Avogadro's number within a factor of 5. He was able to do this by dropping 1 teaspoon of oil on a still pond and determined the area covered by the oil at about ¾ of an acre. You can simulate this by adding 1 drop of soap on the top of a greasy pan in the kitchen and watch the grease move to the sides. Sketch the interaction of the soap with the layer of water and sketch how the soap "dissolves" grease in water.

Accepted Answer

The answer of Ben Franklin determined Avogadro's number within a...

Quiz 9: Properties of Solutions

A solution is made from dissolving 102 grams of potassium carbonate in 100 grams of water. What is the solvent in this solute in the solution and explain.

Determine the mole fraction of a solution made from mixing 39 grams of sugar (MM = 180 g/mol) with 310 grams of water.

Industrial grade concentrated HCl is known as muriatic acid and is 31.45% by mass HCl in water. What is the molality of this solution?

The molecule drawn below is Vitamin D, Calciferol. Would you predict this molecule to be more soluble in water or body fat and explain why?

The molecule drawn below is Vitamin B1, thiamine. Would you predict this molecule to be more soluble in water or body fat and explain why?

Pesticides have been found to accumulate and affect the growth of animals higher in food chain. Can you give some rational for this, including discussion of the solubility of pesticides in general?

When both solid Na metal and solid NaCl are added to water a colourless solution develops. How are these processes different?

Consider a can containing 355 mL of a carbonated soft drink at 0°C under 2.2 atm CO2 pressure. What is the concentration of CO2 in the soda, assuming that KH = 7.8 x 10-2 M/atm?

The problem with hot water heaters in some parts of the country is that a solid forms inside of them, CaCO3. Predict if the solvation process for CaCO3 is endothermic or exothermic and if it is more soluble or less soluble at colder temperatures.

Fahrenheit developed his temperature scale where he set zero degrees as the freezing point for a salt-water solution. What is the concentration of this salt solution in molality (assume NaCl in water)? (Tf = 1.86 ˚C/m)

Automobile coolant is about 50% by mass ethylene glycol in water. The line structure of ethylene glycol is shown below: What is the normal boiling point of this solution if Kb for water = 0.512 ˚Cm-1?

When 0.64 g of adrenaline is dissolved in 36.0 g benzene (Kf = 5.12 °C), the freezing point is lowered by 0.50°C. Determine the molecular mass of adrenaline.

To what minimum temperature would a radiator be protected if equal volumes of ethylene glycol (permanent antifreeze) (density 1.11 g/mL) and water were mixed? Assume that ethylene glycol does not dissociate and has a formula, C2H6O2. (Kf = 1.85 ˚Cm-1).

What is the freezing point of a solution made from mixing 39 grams of sugar (MM = 180 g/mol) with 310 grams of water? (Kf = 1.85 ˚Cm-1)?