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Natural Science Lab Task 1 Passed First Try
Natural Science (Western Governors University)
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Section I: Introduction and Literature Review
A. Based on research from an experiment conducted by Lesley-Anne Giddings an assistant
chemistry and biochemistry professor who was interviewed in the Live Science magazine
the length of time it takes for water to boil has a lot of factors, first the type of water
(pure, salt, etc.). (Geggel, 2021) Next is the amount of water being heated to its boiling
point. Lastly are any added substances that may change the molecular make up of water.
Dr. Karl from ABC Science gave a lot of background information on how water reacts
when heated but also about how salt affects the molecules that make up water. He also
gives a lot of information on the process of heating water and the way it changes into
steam. (Kruszelnicki, 2007)
Section II: Hypothesis
B. I believe that adding salt to water will make it boil faster.
C. From the research I have found adding salt to water raises the boiling point however not
by much, but the boiling point has been proven to be higher. I presume that by the boiling
point being raised that the time it takes for the water to boil will be lessened since
research showed that it cooks faster with the higher temperature.
Section III: Method
D. The independent variable is the amount of salt I put into the water. This variable will be
manipulated by adding to the amount of salt by a half tablespoon at the start of each
experiment.
E. The dependent variable will be the time it takes for the water to boil. I will be using 2
cups of water during each test and the boiling time will be measured in minutes and
seconds.
F. One external compound variable is the level of heat I use on the stove. I have an electric
stove and the heat range goes from low to high or 1-10. I chose to keep the stove at level
8. I also chose to let the stove heat before adding the water to it and I didn’t turn it off in
between experiments so as not to confuse my results.
G.
Materials:
3qt saucepan
10 cups of water (separated into separate bowls with 2 cups of water in them.)
Salt
Spoon
Timer
Stove (set to level 8)
Notebook and Pen
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Sink to rinse saucepan between tests
½ tablespoon measuring spoon
H.
1. Preheat stove to level 8
2. Add 2 cups of water to saucepan
3. Place saucepan on stove and start timer
4. When water reaches boiling point remove saucepan from stove and stop timer (be sure to
leave stove on in between each test)
5. Rinse saucepan with cold water to cool and rid of residue
6. Add 2 cups of water and ½ teaspoon of salt and stir to mix
7. Place saucepan on stove and start timer
8. When water reaches boiling point remove saucepan from stove and stop timer
9. Rinse saucepan with cold water to cool and rid of residue
10. Repeat steps 6-9 until 2 tablespoons of salt have been tested
Section IV: Result
I. I found that with salt added to the water the boiling time increased. There is no trending
times between salt levels so the amount of time it increased a different amount each time.
J.
Salt (tablespoon)
Time (min:sec)
0
4.55
0.5
5.01
1
5.27
1.5
5.48
2
6.13
0 0.5 1 1.5 2
0
50
100
150
200
250
300
350
400
295 301
327
348
373
Boil tmes when salt is added
Salt (Tablespoons)
Time (seconds)
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Section V: Conclusions
K. My hypothesis was refuted. The amount of salt added although added in ½ increments
didn’t provide a trending amount of time between findings, so even though the amount of
time between test 1 and 2 was 6 seconds, the amount of time between test 2 and 3 was 26
seconds.
L. One uncontrolled confounding variable that could have influenced my results would be
the additives or chemicals in the water since I used tap water. Those additives could
possibly ruin my results if they influence the time it takes for the water top boil. My
experiment can be improved by using a distilled or spring water that doesn’t have any
unknown chemicals or additives so that my results can be pure.
M. My results relate to my references because the higher water temperature while boiling
directly relates to the time it takes for the water to reach its boiling point. The boiling
point of water is 100°C, with salt added that degrees increases, which will also increase
the time it takes for the water to reach its boiling point.
References
Geggel, L. (2021, June 1). Does salt make water boil faster? Live Science. Retrieved January 9,
2023, from https://www.livescience.com/56214-does-salt-make-water-boil-faster.html
Kruszelnicki, K. (2007, April 12). Salt in the water. ABC. Retrieved January 9, 2023, from
https://www.abc.net.au/science/articles/2007/04/12/1894612.htm
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