# AMMONIUM NITRATE

Satisfactory Essays
SCIENCE REPORT
AMMONIUM NITRATE
NH4NO3

Problem
Our task was to investigate what the optimum ratio of solute to solvent that will produce the maximum cooling/heating effect?

Hypothesis
With a smaller quantity of water (50mls) and the same amount of Ammonium Nitrate added. After any period of time the mixture will be a cooler temperature than that of a mixture with a larger quantity of water.

Variables
„X Water
„X Teaspoons
„X Time
„X Ammonium Nitrate
„X Thermometer
„X Stirring (used thermometer)

„« Changed/Uncontrolled Variables
- The amount of times the mixture was stirred. We stirred the mixture until the Ammonium Nitrate was dissolved, so the amount of times we stirred after each teaspoon was different.
- Each teaspoon may not have been equal. Measurements were made based on judgment and not exact measurements.

„« Controlled Variables
- Amount of water used in each test was equal (100mls and 50mls).
- Total amount of Ammonium Nitrate used (150grams).
- Temperature was measured after and exact time i.e. 1 minute, 2 minutes, 3 minutes.

Equipment
Trial test
„X 1 thermometer
„X 1 plastic teaspoon
„X Safety glasses
„X 100ml beaker
„X 30mls of water
„X 1 teaspoon of Ammonium Nitrate
„X 1 stirring rod

First Test
„X 1 thermometer
„X 1 plastic teaspoon
„X 1 stop watch
„X 1 stirring rod
„X Safety glasses X3 (one for each group member)
„X 250ml beaker
„X 150 grams of Ammonium Nitrate
„X 100mls of water

Second Test
„X 1 thermometer
„X 1 plastic teaspoon
„X 1 stop watch
„X 1 stirring rod
„X Safety glasses X3 (one for each group member)
„X 100ml beaker
„X leftover from original 150 grams of Ammonium Nitrate
„X 50mls of water

NOTE: The stirring rod was not used in the First and Second experiments, as it was not available. A substitute we used the thermometer.

Methods

Trial Test
In a 100ml beaker 30mls of water was placed the temperature of the water was recorded. 1 teaspoon of Ammonium Nitrate was added to the water and stirred until dissolved. The temperature was then recorded again. This was to see the difference between the initial temperature and the final temperature.

First Test
In a 250ml beaker place 100mls of water, measure the temperature of the water and record this initial temperature onto a table. Set the timer and add one teaspoon of Ammonium Nitrate to the water, stir this continuously until the Ammonium Nitrate has dissolved. After 1 minute measure the temperature and record it, do this for a further 2 minutes (3 minutes in total). Repeat this process for a total of 10 teaspoons.

Second Test
In a 100ml beaker place 50mls of water, measure the temperature of the water and record this initial temperature onto a table. Set the timer and add one teaspoon of Ammonium Nitrate to the water, stir this continuously until the Ammonium Nitrate has dissolved.