conclusion:
The aim of the experiment stated “to identify if pure water or salt water boils faster”. The outcomes resulted in salt water boiling at 330 seconds (average) whereas pure water boiling at 520 seconds (average). The outcomes of this experiment proven my hypothesis correct which was “salt water will boil faster than pure water”. I have controlled my variable by putting the same amount of water in each pot (900mL). Another controlled variable is boiling point of water which is 100 degree Celsius for both liquids (salt and pure water) by the use of thermometer.
discussion:
In this investigation, the results corresponded to my hypothesis that “salt water will boil faster than pure water because it takes less time to raise the temperature or in another word it will get to its boiling point quicker”. This is shown in the first trial where the salt water boils at 340 seconds and pure water boils at 540 seconds. Hence the salt water boils the fastest. The experiment was repeated twice which proved my reliability and it gave me a accurate result. The amount of water in each pot, accurate amount of boiling rate and time ensured that my experiment was valid. Improvements can be made by repeating the experiment more than twice, experimenting with various types of water such as hot water, sugar water, cold water and so on. Also by changing the amount of water in each pot (500mL or 1L).
Logically written discussion:
Salt water will boil faster than pure water because it will heat up quicker and get to its boiling point first. Also, when you add salt there is something called “boiling elevation point”. Boiling elevation point occurs when a dissolved substance (in this case it is salt) is added to pure solvent (the water itself) to create a solution (the salt water). By adding salt to the water it makes the temperature rise by 2 degree Celsius. The boiling point increase is calculated by using “ebullioscopic” constant of water.