Boiling Point of Water Affected by NaClArchy & Cici | Miss.Black | Maple leaf International School

Problem / Question

We wonder whether adding other substances, such as salt, into the water would affect its boiling point. If so, will it increase or decrease the boiling point?

IntroductionIn daily life, we often use salt in cooking. Besides, we notice that people could use salt to ease their cooking process without using pressure cookers in places at high altitudes like plateaus. We suppose that adding more salt would increase the boiling point of water. If our hypothesis is correct, there might be also some usage of this knowledge in industrial and scientific fields.

HypothesisWe assume that, by adding more salt into the water, its boiling point would rise. We think if the density increases, it's harder for the substance to boil. There are more substances in the water, so it might need more energy to heat up and boil.

MaterialsMaterials Quantity

Beaker 1

hot plate 1

thermometer3 2

balance 1

water 770 g

NaCl 100 g

sugar 50 g

Procedure

Heat a beaker of 100g water and record the boiling point.

Step 1

Heat another beaker of 100g water with 10g

NaCl and record the

boiling point.

Step 2

Dissolve 10 more grams

NaCl into it and record the

boiling point.

Step 3

Dissolve 20 more grams

NaCl into it and record the

boiling point.

Step 4

Results table

Graph

DiscussionI. Important ResultsFigure 1: NaCl seems to be quite effective compared with sugar. Consecutive coordinates indicate a linear relationship between the amount of NaCl and the boiling point of the solution. This conclusion is backed up by a theory and a correlated equation.Figure 2: This effect is not only caused by the amount but also the proportion of NaCl in the water.I. Sources of ErrorTrial 1 Experiment I: Reading recorded before the solution boiled.Solution: Wait longer or cover the beaker with a lid that only allows the thermometer to pass a hole on it.Trial 1 Experiment II: Experiment stopped because of false assumption.Solution: Be honest when collecting data to form empirical conclusions.Trial 1 Experiment IV: Reading out of range.Solution: Replace the laboratory thermometer with a digital one.ass a hole on it.

ConclusionSome substances will increase the boiling point of water, which means our hypothesis was correct. However, the theory behind this phenomenon works for a lot more substances than we thought it would be. We should created more trials and use more kinds of solutes next time to plot more data on a graph and see the linear relationship. Our experiments proved that salt can be used at high altitudes to ease the food-cooking process once again.

Variable• Experiment I:• Constant: solute mass• Independent variable: solvent mass• Experiment II:• Constant: solution mass• Independent variables: solvent mass and solute mass• Dependent variable: boiling point

Change the solute into sugar and

repeat steps 2 and 4.

Step 5

Make a 100g solution with

10g NaCl and record the

boiling point.

Step 6

Make a 100g solution with

20g NaCl and record the

boiling point.

Step 7

Tidy up the lap, put

equipmentin in its former

position.

Step 8

Eddu saver. (2019, Nov 2). To investigate the effect of the concentration of salt in the water on boiling point essay.https://www.eddusaver.com/to-investigate-the-effect-of-the-concentration-of-salt-in-the-water-on-boiling-point-essay/

Action Donation Servies. (2015, August 25). Effect of Salt on the Boiling Temperature of Water.https://actiondonation.org/effect-of-salt-on-the-boiling-temperature-of-water/

Tomas er. (2007, October 20). Freezing point depression and boiling point elevation.https://en.wikipedia.org/wiki/Boiling-point_elevation#/media/File:Freezing_point_depression_and_boiling_point_elevation.png

Stefan V. (2015, November 28). https://socratic.org/questions/what-is-the-boiling-point-of-a-solution-made-by-dissolving-31-g-of-nacl-in-559-g