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Biology Properties of water lab Essay

Properties of water Question Does mixing water with other substances change it’s boiling point. Research The boiling point of a liquid is when the temperature causes the vapor pressure to be equal to the air. Air density will change waters boiling point. High altitudes give water a lower boiling point. Hypothesis If the water is less dense then it will boil faster and the boiling point will be lower. Materials 1 pot A Sink A Stove 1 tablespoon of sugar 1 tablespoon of salt 1 tablespoon of water 6 cups of water Thermometer Stopwatch Procedure

The independent variables for this experiment are the types of water solutions used. The dependent variable is the boiling temperature of the water which will be measured by a thermometer. The control group is the water. The constants are the Stove top and amount of water used in each solution the starting temperature of the water and the Pot. 1. Pour 2 cups of water in the pot add 1 tablespoon of sugar then stir it up until all sugar is dissolved. 2. Turn on the stove, set the stove to it’s highest setting, place the pot on and time it with a stopwatch.

Record the time and temperature of the solution as soon as it begins to boil. Record the data on your table. 3. Rinse pot vigorously to remove impurities, and allow the stove to cool. 4. Pour 2 cups of water in the pot add 1 tablespoon of salt and stir. Repeat steps 2 and 3. 5. Pour 2 cups of water in the pot then add 1 tablespoon of water. Repeat step 2. Observations When boiling the water it was quite pure and clear . There was no smell to tit when boiling the salt water it was cloudy and the bottom of the pot was coated with salt.

When boiling the sugar water it was cloudy but no residue was left in the pot. Solutions Time (in seconds) Temperature ;F Water 188 210 Salt Water 167 208 Sugar water 219 Conclusion Based on the graphs water has the highest boiling point over both salt and sugar water. The sugar water took the most energy to begin to boil and the salt water took the least as the heat evaporated some of the salt, which was left coating the pan. I don’t think we changed the waters boiling point by adding a new substance but we did change how fast it would come to a boil by making it more or less dense.

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