Can anyone tell me the dependent, independent and constant variables of this IP?
PROJECT TITLE
The Effect of Salt on the Boiling Temperature of Water
PROBLEM
How does table salt affects the boiling temperature of water?
HYPOTHESIS
Adding table salt to boiling waer will cause the water to boil at a higher temperature.
EXPERIMENTAL DESIGN
A. Materials
•Table Salt
•Distilled Water
•2 Quart Cooking Pot
•Pint measuring cup
•Teaspoon and tablespoon measuring spoons
•Thermometer
•Stirring spoon
B. Procedure
1.Boil one quart of distilled water on a stove.
2.Measure the temperature of the boiling water. Record the highest temperature reading. This is the control to compare with.
3.Measure out table salt using a kitchen measuring spoon. Level the spoonful.
4.Add the measured salt to the boiling water and stir.
5.Measure the temperature of the boiling water with the salt in it. Record the highest temperature reading.
6.Repeat for other amounts of salt.
Thanks! ^^
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3 responses so far ↓
1 Kangaru // Jun 27, 2008
makes it higher than 100 degrees C
2 3 // Jun 27, 2008
Dependent variable: how much salt you add.
Independent Variable: temperature.
controlled variables:
amount of distilled water
how often you check the temp
independent variable is what you change to get different results
dependent variable is what you are measuring
controlled variable is what you keep the same to make your results accurate
Hope this helps.
3 uy_stephanne // Jun 27, 2008
The constant variables are the kind of water (distilled), the size of the cooking pot, the size of salt you put should be considered if you're only after the effect of the amount of salt not the size(ex. rock salt, granulated salt. etc…), and the amount of heat you used in the stove. Although if I were to perform this experiment, the salt should never be stirred using the stirring rod because agitation along with the particle size and temperature are factors that affect dissolution… You may never know that you exerted more force in stirring one set-up than the other. Anyway, the salt can still dissolve in water only for a longer period of time if you won't stir.
The dependent variable is the temperature it will take for the water to boil in each set-up since it is dependent to the amount of salt you put.
The independent variable is the amount of salt you put in each set-up.