2. Mystery Substance?
• Was in kit with the salt and Epsom salts
• Might be salt or Epsom salt or
something else
• Like to figure out what it is
• Need to wear protective goggles and be
careful
3. Substance Data Sheet
• Has information about the properties of
five substances, including salt and
Epsom salts
• Observe the mystery substance and
record properties on the Data Sheet
4. Challenge
• Can you test the mystery substance to
find out what it is?
• @ 5 minutes to develop group plan for
identifying the mystery substance.
• Once the planning time is up, begin
your challenge
5. Mystery Material
• What is the mystery substance?
• What evidence do you have to support
your conclusion?
• Does this substance form crystals?
How could we find out?
6. Solubility Results
• Make sure you have the solubility
results for salt, Epsom salts, and the
mystery chemical recorded in your
notebook.
• Which of the three chemicals we tested
is the most soluble in water?
• Which is the least soluble?
• If you wanted to make 10 liters of
saturated salt solution to pickle some
fish, about how much salt would you
need?
8. Solubility
• What conclusions can be made from
the results?
• An important property of a substance is
how it dissolves in a liquid, such as
water. The property of “dissolvability” is
called solubility. Different salts have
different solubilities.
• Were you able to dissolve more Kosher
salt or Epsom salts in 50 ml of water?
• 45-65g of Epsom salts dissolves in
50ml of water
9. Vocabulary
• Solubility
– A property that substances have of
dissolving or being dissolved easily. The
greater the solubility of a substance, the
more it dissolves.
• Epsom salts
– A non-edible salt used to make a soothing
salt bath to soak sore feet.
10. Content
• Which is more soluble in water, salt or
Epsom salt?
• Epsom salt is about four times more
soluble than salt.
• Your questions?
