Factors Affecting Rate of Solvation

Factors Affecting Rate of Solvation

Experiment performance indicator:

Investigate the factors affecting solvation

Basic scientific skills:

  • Observation
  • Measurement
  • Deduction and Conclusion
  • Communication

Materials:

  • Glass cup
  • Sugar cubes
  • Mortar and pestle
  • Cool Water
  • Hot water
  • Stirring spoon
  • Stopwatch clock

Procedure:

Effect of the surface area on the solvation

  1. The cup was filled with cold water (water at room temperature) up to the middle as shown

 

  1. A stopwatch was used to determine the required time for total solvation.
  2. Started the stopwatch counting when the sugar cubes were added to the water
  3. Added two cubes of sugar to the cup. A stopwatch was used to count the time
  4. Stirring was carried out with the help of a spoon, with a consistent movement and uniform speed until the total solvation
  5. The time required to completely dissolve the two sugar cubes was recorded
  6. Washed the cup well. Then, repeated the same procedure by using ground sugar
  7. Filled the cup with cold water up to the middle as shown in the picture above.
  8. Ground two cubes of sugar in the mortar with the help of a pestle
  9. The stopwatch was used to determine the required time for total solvation. Started the timing when the sugar cubes were added to the water
  10. Then added the granulated sugar to the glass and started the stopwatch
  11. Stirred the sugar with the spoon, with consistent movement and uniform speed until the total solvation.
  12. Recorded the time required to completely dissolve the grounded sugar in cool water in the table below.
The time required to dissolve the sugar cubes in cold water 5 minutes
The time required to dissolve the granulated sugar in cold water 2 minutes
Conclusion The time of solvation of granulated sugar in cold water is less than that of sugar cubes in cold water

The cup was filled with cold water (water at room temperature) up to the middleEffect of temperature on the solvation Process

  1. Use a stopwatch to determine the required time for a total solvation
  2. Add two cubes of sugar to the cup.
  3. Stir the sugar cubes with the spoon, with a consistent movement and uniform speed until the total solvation
  4. Recorded the time required to completely dissolve the two sugar cubes in the table below
  5. Washed the cup well. Then, repeated the same steps using hot water
  6. Heated some water for 2 minutes over medium heat
  7. Filled the cup with hot water up to the middle
  8. Used a stopwatch to determine the required time for total solvation.
  9. Added two cubes of sugar to the cup. Started the stopwatch.
  10. Stirred the sugar cubes with the spoon, with a consistent movement and uniform speed until the total solvation
  11. The time required for the complete dissolution of sugar cubes in hot water was recorded

 

The time required to dissolve in for the sugar cubes cold water 5 minutes
The time required to dissolve the sugar cubes in hot water 1 minute and 30 seconds
Conclusion Sugar cubes dissolve faster in hot water than in cold water

 

Effect of stirring in the melting process

  1. Filled the cup with cold water up to the middle
  2. Used a stopwatch to determine the required time for a total solvation
  3. Started the timing once the sugar cubes are added in glass cup containing water
  4. Added two cubes of sugar to the cup. Start the stopwatch
  5. When the sugar cubes were dissolved completely in water without stirring
  6. Recorded the time required to completely dissolve the two sugar cubes
  7. Washed the cup well. Then, repeated the same steps while stirring during the solvation process
  8. Filled the cup with cold water up to the middle
  9. A stopwatch was used to determine the required time for total solvation.
  10. Added two cubes of sugar in the cup
  11. Stirred the sugar cubes with the spoon
  12. Then recorded the time required to completely dissolve the two sugar cubes in the table below.
The time required for the sugar cubes to dissolve in cold water without stirring 13 minutes

 

The time required for the sugar cubes to melt in cold water with stirring 5 minutes
The conclusion Stirring reduces the time for solution formation

Factors Affecting Rate of Solvation

Assessment questions:

Q1: describe the factors which affect the solubility of solids in liquids?

  • Chemical nature
  • Size of solute particles
  • Temperature
  • stirring

 

Q2: why grounded sugar dissolves faster than sugar cubes in cold water while using the same mass of sugar?

The time required for dissolving the sugar cubes is greater than dissolving the granulated sugar. This is because of surface area phenomena. The size of the particles is inversely proportional to the surface area. At the large surface area, particles have more area to interact with water molecules, so it dissolves easily and faster. This is the reason that grounded sugar dissolves faster than sugar cubes in cold water while using the same mass of sugar.

Q3: Explain why the same mass of sugar cubes dissolves faster in hot water than in cold water

As the temperature of the water is increased, the average kinetic energy of the molecules that make up the solution also increases. The increase in kinetic energy allows the solvent molecules to move faster and break the electrostatic attraction of solute molecules more effectively. Hence the same mass of sugar cubes dissolves faster in hot water than in cold water

Q4: Explain why the same mass of sugar cubes dissolves faster with stirring than without stirring in cold water

Stirring of the solution makes particles (of both solute and solvent) move faster, which increases the chances that they will interact more with solvent/ solute particles. This results in an increase in the rate of solution formation. That’s why the same mass of sugar cubes dissolves faster with stirring than without stirring in cold water.

Factors Affecting Rate of Solvation

 

close
New Post Update Every Day
Don’t miss these Chemistry topics!
Sharing Is Caring:

2 thoughts on “Factors Affecting Rate of Solvation”

  1. I must thank you for the efforts youve put in penning this site. I am hoping to check out the same high-grade blog posts by you in the future as well. In fact, your creative writing abilities has motivated me to get my very own blog now 😉

    Reply

Leave a Comment