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What factors affect the rate of dissolving?

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by

Brandon Counts

on 16 June 2016

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Transcript of What factors affect the rate of dissolving?

It is the measure of how fast the solute dissolves in a solvent.
More About Dissolving
Dissolving occurs on the surface of the solute
Smaller particles dissolve much faster than larger ones
This occurs because there is more surface area exposed to the solvent
What are the three factors???
Temperature
Agitation
Surface Area
The rate of dissolving
How?
As the temperature of the solvent increases, the amount of dissolvable solute increases.
Adding energy increases molecular motion
This allows the molecules to come apart easily
Solvent molecules are able to contact solute molecules which is why dissolving happens.
The photo above shows three examples of an rxn that will occur.
The cup towards the right has temperature on its side which indicates that it will dissolve much quicker than the other two cups.
Temperature
Temperature affects the rate of dissolving by being able to mix the particles together faster
As the particles in the solvent are introduced to heat, the rxn is able to speed up
The photo above shows a solution of sugar and water but the sugar has not yet dissolved completely.

On the right, it shows the sugar has completely dissolved into the water which has created sugar water
This rxn was able to occur due
to an outside force of stirring
Agitation
Better known as stirring or shaking
This allows solvent molecules to have continual contact with the solute
What is the rate of dissolving?
Factor one
Factor two
What factors affect the rate of
dissolving?

Factor Three
Surface Area
The amount of surface of an object is surface area
The surface area exposed tot the solvent is what determines the rate of dissolving for a solute.
How?
When solute is expanded into smaller particles rather than just one giant chunk, it has more surface area.
This allows for more solute to be exposed at a given time which speeds up the rate of dissolving
The photo shows how when you increase the surface area (crushed) less time is taken rather than if you leave it as a whole or chunks.
Surface area increase or speeds up the reaction by reducing the time it would take if left as whole
http://mhs.nbed.nb.ca/sites/mhs.nbed.nb.ca/files/doc/teacher/29/chapter_6_notes.pdf
http://www.middleschoolchemistry.com/lessonplans/chapter5/lesson6
http://www.ck12.org/book/CK-12-Chemistry-Concepts-Intermediate/section/16.2/

By Brandon Counts
Full transcript