Comparing Ionic and Molecular Substances Lab Report by
Vaishali Patel
Purpose- comparing the solubility in water and ionic and molecular substances.
Hypothesis- If all of the powders have mixed, then it have a reaction.
Material- stir rod, watch glass, sample beaker ,distilled water stir rod, conductivity tester, waste
beaker, and paper.
Watch Glass, stir rod, conductivity tester, sample beaker ,wooden splint, distilled water bottle, waste
beaker and paper.
ProcedurePut a little bit of distilled water into the watch glass.
Take a small amount of the sample and place it on the wooden splint and add water to it.
Use the stirring rod to the mix the sample.
Pick up the conductivity tester, place it into the watch glass to find if the water and sample mixtures
conducts electricity write your observation down into the sheet .
Put the mixture into waste beaker. Now wash the watch glass and dry it.
Observations
Substance
Name
Type of
substance
(Ionic &
Molecular)
Solubility
in water
Observation
Conductivity
when testing
for conductivity
Salt (NaCl)
Ionic
Partially
Dissolved
Light on
Conduct very well
Potassium
Chloride (KCl)
Ionic
Partially
Dissolved
Light on
Conduct very well
Copper(II) Sulfate
Ionic
Dissolved well
Light on
Conduct very well
(CuSO4)
Starch
Molecular
Partially
Dissolved
Light on
Conduct very well
Simple Sugar
(Glucose)
Molecular
Partially
Dissolved
Light on
Conduct very well
Oil
Molecular
Partially
Dissolved
Light off
Did not conduct
Unknown A
Table Sugar
Molecular
Dissolved well
Light off
Did not conduct
Unknown B
(Potassium
Bromine KBr)
Ionic
Partially
Dissolved
Light on
Conduct very well
Discussion
When Ionic substances are mixed together it partially dissolves but not every substance for example salt
and KCl are Ionic substances when they are mixed together it doesn’t dissolved well abut for copper
sulfate it dissolved very well maybe it is because of the material is in it. A conductivity substances, when
it is dissolved with a sample the light will not might turn on or off it depends.
The solubility in water of an molecular substance that can be partially or well dissolved because when it
was mixed it wasn’t dissolved right may be because when the powder was mixed with water the
material in the powder wasn’t mixed right. The conductively of molecular substance is when the person
is puts the conductively tester in the sample and the sample is molecular the light will be off, but if its
ionic it will turn on.
For unknown A or B if the light turns on it is ionic and if it is not then its molecular, so it dissolved well it
is molecular if it didn’t it is ionic.
Unknown is A is table sugar because table sugar is molecular when it was tested the light was on ,it
dissolved well and it did not conduct. Unknown B is Potassium Bromide because Potassium Bromide is
ionic so when a compound is ionic it is partially dissolved and conducted very well.
Conclusion- the powder sample was mixed with clean water, whether it was dissolved right, and then
record your observation.
My hypothesis was wrong because when the experiments were being done there were no reaction
nothing was formed. For example artificial snow when you add water the snow gets bigger and bigger.