Salt affect the freezing and boiling points of water
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OBJECTIVES:
Water boils at 100oC100oC at 1atm1atm of pressure, but a solution of saltwater does
not . When table salt is added to water, the resulting solution has a higher boiling point
than the water did by itself.
The effect of adding a solute to a solvent has the opposite effect on the freezing point of
a solution as it does on the boiling point. A solution will have a lower freezing point than
a pure solvent. The freezing point is the temperature at which the liquid changes to a
solid.
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THEORY:
We measure temperature, using three
different scales, Fahrenheit , Celsius , and
Kelvin. In 1724, German scientist Daniel
Fahrenheit invented the Fahrenheit scale ,
which measures temperature in degrees
Fahrenheit (°F). He set O^ F as the lowest
temperature he could create in his
laboratory . In 1742 , Swedish astronomer
Anders Celsius invented the Celsius scale
, which measures temperature in degrees
Celsius (C). It has 0°C as the freezing
point of water and 100 degrees * C as its
boiling point. In 1848Scottish physicist and
engineer Lord Kelvin invented the Kelvin
scale. It measures temperature in kelvins
(K) and starts with OK, which is the lowest
possible temperature in the universe , also
known as absolute zero .
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EQUIPMENT AND APPARATUS:
Name
Picture
Function
Used to hold a boiling water
Cauldron
Thermometer
Ice
Beaker
Thermometers are used to
see if you have a fever or
tell you how cold it is
outside.
The transition from ice to
water is melting and from
ice directly to water vapor is
sublimation.
Used to hold and heat
liquids. Multipurpose and
essential in the lab.
Stove
Salt
Measuring Cup
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A stove is a device that
burns fuel or uses electricity
to generate heat inside or
on top of the apparatus.
It is employed for curing and
preserving hides and as a
brine for refrigeration.
A measuring cup generally
consists of scale markings
at varying heights and the
material being measured is
added to the cup till it
reaches the desired level.
CHEMICALS:
Cauldron (Kaldero) (Fe) – Metal is a substance which is lustrous, sonorus,
ductile, and is a good conductor of heat and electricity.
Closest Elements: Fe
Molar Mass: 55.845 g/mol
Thermometer (Hg) - A thermometer is an instrument that measures
temperature. It can measure the temperature of a solid such as food, a liquid such as
water, or a gas such as air.
Formula: Hg+2
Molar Mass: 200.59 u
Ice - Ice is water frozen into a solid state. Depending on the presence of
impurities such as particles of soil or bubbles of air, it can appear transparent or a more
or less opaque bluish-white color.
Formula: \[{H_2}O\]
Molar Mass: 18.0 grams
Salt (NaCl) - Salt is a mineral composed primarily of sodium chloride (NaCl),
a chemical compound belonging to the larger class of salts; salt in the form of a
natural crystalline mineral is known as rock salt or halite.
Formula: CHEBI:26710
Molar Mass: 58.44 g/mol
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PROCEDURE:
To figure out how salt affects the boiling point of water, She decided to boil 2 pots of
water. One with salt and one without A boil without a salt boil faster with a salt. When a
solute is added to a solvent, the solution boiling pint will increase. The boiling point of
water is raised so the pot with the salt added takes longer to boil because its boiling
point is higher than the solvents.. She put the solute in to the solvent to figure out how
salt affect the freezing ice, she make 2 plastic bag full of ice. One with salt and one
without salt. A ice without salt freezing faster than with a salt.
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DATA AND ANALYSIS:
NAME
WITH SALT
WITHOUT SALT
BOILING
The one with salt boil
faster
But the one without salt it
take time to boil
FREEZING
The one with salt Freeze
the ice cream fast
But the one without salt it
take you forever to freeze
that ice cream
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SUMMARY OF FINDINGS:
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CONCLUSION:
This experiment’s goal is to determine how salt affect the boiling water and freezing ice
cream faster. If you
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GUIDE QUESTIONS:
1. How salt affect the experiment?
2. What will you choice if you make this experiment the one with salt or without
salt? Explain?
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APPENDICES:
REFERENCES:
https://www.youtube.com/watch?v=0la5u0mBe8c&t=70s
https://en.wikipedia.org/wiki/Main_Page