Int Task 3
How does salt have an effect on freezing point of water?
2. Relevance of your testable question
When salt is added to water it results in the reduction of its freezing point and the density of water increases. Freezing point depression which is a colligative property does not depend on its solute character rather it depends only on its solute concentration.
3. Literature review
Entropy is frequently defined as a quantitative measure of randomness. When a solute is dissolved in a solution similar to water, the entropy of the solution increases. Freezing becomes extemporaneous when the extent of heat energy lost by the water during freezing is equivalent to the temperature times the …show more content…
Two outside sources and examples of similar experiments:
Please look at the Literature Review for Answer.
In an experimental design, do the following: 1. Experiment Steps
The outcomes show that adding salt to the solution will decrease its freezing point. Solute used | I (mol) | Salt (grams) | Freezing point of water (°C) | 0.5 | -1.8 | | 1.0 | -3.6 | | 1.5 | -5.5 | | 2.0 | -7.4 | 1. Design Plan reasons:
I decided to work with this experimental design plan because the items are easily available and also found similar experimental design plans in the literature. Living in the Midwest and experiencing snow every winter season this is easily seen when salt is thrown on the roads. As salt is added, the freezing point drops and ice starts to melt. 2. Tools, Techniques and Measurements:
Scientific Terms: Freezing point depression, MOL - Molar mass
The supplies required for this project are: * 1 pack of salt | * 400 ml of purified water | * 4 test tubes | * 4 beakers | * 1 basin | * A freezer | * Trays of Ice cubes | * City water | * Thermometers (Qty 4) | * A digital weighing scale | * A black marker |
3. Explanation of variables:
Dependent Variables: Freezing point of the solution that would be measured using a thermometer.
Independent variable: is the quantity of salt