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WATER THE UNIVERSAL SOLVENT

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by

Meghan Vismara

on 23 December 2014

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Transcript of WATER THE UNIVERSAL SOLVENT

UNIVERSAL SOLVENT
Before we begin, let's get some vocabulary:
MATERIALS
You should have at your lab table:
Baking Powder
Baking Soda
Sugar
Salt
Kids' beverage mix
Coffee
Rice
Cups of Water
Spoons
Hypothesize
On your lab sheet put a check mark or "yes" next to the potential Solutes (the solids that we are going to try to dissolve in water) that you think will dissolve.

In the WHY? column, write your reasons. Is there a pattern between the ones that you think will dissolve?
NOTE: In reality, coffee would eventually dissolve all the way in water. It's particles were too big to dissolve all the way. This is a MIXTURE but would eventually turn into a SOLUTION if left for an extended period of time.
This is when a solid (like salt) "disappears" into a liquid (like water).

The more fancy, scientific definition is: When a solid becomes incorporated into a liquid so as to form a solution.
Dissolve
This is a liquid that dissolves solids. In our salt water analogy, the WATER is the solvent.
Solvent
This is the term we use to describe the solid that is being dissolved into the liquid. In our salt water analogy this is the SALT.
SOLUTE
Universal Solvent
Because of its polarity, water dissolves many substances. Therefore, water is often called the universal solvent. Salt (NaCl) is just a familiar substance that water dissolves, but water actually dissolves many things.

Try to think of other examples that water dissolves in your head before you do this lab. Tell one or two examples to your lab partners.
Water as a solvent is very important to living things. Water transports important dissolved substances, like food energy and vitamins, through our bodies. And most of the chemical reactions that take place inside organisms (living things) involve substances dissolved in water.
Universal Solvent and Life
Baking Powder
Baking Soda
SUGAR
SALT
Kids' Beverage Drink Mix
Coffee
RICE
The question for today's lab is:

Water is called a “universal solvent” because it dissolves so many things. Which of the following household items will it dissolve?
GLUE IN YOUR LAB SHEET
Line up the cups of water and try to dissolve each of the potential solutes by pouring each solute into a separate cup. Use the spoons to stir. When the solutes do or do not dissolve, record this in the data section of your lab sheet.
Experiment
Do not try to put too much of any solute in the water. There is only so much solute that the water can dissolve of any substance.
NOTE:
Make a conclusion:
Was there a relationship between the substances that dissolved or didn't dissolve?

Write your thoughts on the lines provided on your lab sheet.
Discuss with your group:
How is this important for living organisms in the ocean?
What kinds of substances don't dissolve in water? Can you use a fancy science vocabulary term to describe these?
Discuss with your group:
DISSOLVE! DISSOLVE! WATER CAN DISSOLVE! BECAUSE OF THIS WE CALL IT THE UNIVERSAL SOLVENT!
REMEMBER
BECAUSE WATER IS POLAR...IT CAN DISSOLVE MANY THINGS
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