Speeding Up the Dissolving Process

Speeding Up the Dissolving Process

1.Planning

Problem:

What speeds up the dissolving process?

Hypothesis:

I think these factors will affect the dissolving process:

vTemperature at which the reaction is carried out.

v Particle size of the solute.

v Stirring of the solution.

However in my investigation, I am investigating temperature and the

particle size of the solute.

Prediction

From using my scientific knowledge and understanding, if the particle

size of the solute is smaller, the particles can easily diffuse with

the solvent's particles and fill in the spaces between them. In

addition, the surface area is also increased if the particle size of

the solute is smaller, giving a greater area for the particles of the

solvent to collide with, so the solute can dissolve quickly.

If the temperature is high, more kinetic energy is given to the

particles, therefore the particles would move faster, mix in with the

particles of the solvent, and will easily dissolve in it.

Variables inc. Different experiments with different strategies:

Experiment 1: Investigating the rate of dissolving in various

temperatures.

Control Variable:

1. The solute is the same: sucrose;C12H22O6(sugar)

2. The solvent is the same: water; H2O

3. The mass of sugar is the same: 0.5 g

4. The size of the sugar particles is the same: granulated sugar.

5. The same quantity of water used: 25ml.

6. No stirring or movement for the particles.

Independent Variable

The temperatures are going to differ; this experiment is going to be

split up for the various temperatures, therefore each boiling tube has

water with different temperatures. In addition, a water bath is going

to be used to get a high temperature.

Dependent Variable

Measuring the time, it takes to dissolve the sugar in the water, in

minutes.

Experiment 2: Investigating the rate of dissolving with different

sizes of sugar particles:

Control Variable:

1. The solute is the same: sucrose;C12H22O6(sugar)

2.