Rate of dissolution
The rate of dissolution is affected by some factors like stirring, temperature,
surface area , nature of solvent and solute.
Stirring effect: we took 25 ml water and 2 g sugar in two test tubes
Rate of
dissolution
Time it takes
63sn
Stirring
Surface area
temperature
Nature of the
solute
yes
constant
constant
constant
Not dissolving no
constant
constant
constant
Surface area: we took cube sugar in a beaker with water and granulated sugar
into the another one.
Rate of
dissolution
Time it takes
20min.
26min.
Stirring
Surface area
Constant cube
constant granulated
sugar
temperature Nature of the
solute
constant
Constant
Constant
constant
Temperature: we took 25 ml water and 1 g sugar in two test tubes.
Rate of dissolution
Time it takes
15 min
Stirring
Surface
area
Constant constant
temperature Nature of the
solute
yes
Constant
No dissolving
constant Constant
no
constant
Nature of solute: we took small amount of salt and water in a tube and sugar
and water into the another one.
Rate of
dissolution
1.5 min
Stirring
Surface
area
Constant Constant
temperature Nature of the
solute
Constant
salt
2 min
Constant Constant
Constant
sugar
Nature of solvent: we took 1 gr sugar in test tube and added 20 ml water. for
another tube, we took 1 gr sugar and 20 ml alcohol
Rate of
dissolution
No dissolving
Stirring
Surface
area
Constant Constant
temperature Nature of the solvent
with same solute
Constant
Alcohol
14 min
Constant Constant
Constant
water
For stirring, dissolution increases with stirring or shaking because stirring
brings fresh solvent into contact with undissolved solid
For temperature, dissolution increases with increase temperature because at high
temp, solvent molecules have more kinetic energy so,they collide with
undissolved solid molecules more often thus dissolving
For surface area, smaller particles have more surface area than larger size
particles. Since dissolving occurs at the surface of the solute, this allows more
solvent to come in contact with more solute.
For nature of solvent and solute, the rate of dissolution depends on some
specialties of solute and solvent such as structural features,characteristics