Experiment Supplies Supplies: , , - Explore! Ammonium nitrate is only moderately toxic, and is safe to use as a fertilizer on food crops. Have them record this temperature. Retrieved April 30, 2009, from This more-advanced site discusses the thermodynamics of the ammonium nitrate reaction. One typically determines the heat capacity of the aqueous solution Csoln from the mass of the solution msoln and the specific heat capacity of the solution ssoln. How do nitrates get into the water. The cold beaker can be passed around the class once the evolution of ammonia has stopped.
Therefore the overall dissolution of ammonium nitrate in water is strongly endothermic. You can measure the amount of heat that is involved using Equation 1. In this lab we will use colorimetric assays which yield a color only in the presence of ammonia or nitrate. When it is dissolved in water, it splits into positive ammonium ions and negative nitrate ions. The endothermic reaction between water and ammonium nitrate is used in chemical cold packs.
Ammonium nitrate is potentially hazardous, wear gloves and safety goggles when working with it. Difficulty Time Required Average 6-10 days Prerequisites None Material Availability A few specialty items, including instant cold packs containing ammonium nitrate, are needed. The ammonia required for this process is obtained by the from nitrogen and hydrogen. Large stockpiles of the material can be a major fire risk due to their supporting , and may also detonate, as happened in the of 1947, which led to major changes in the regulations for storage and handling. Record the temperature of the water. Chemistry is the study of matter—what it is made of, how it behaves, its structure and properties, and how it changes during chemical reactions.
Sadly, the majority of those killed were volunteer firefighters who had responded to the fire and were unable to retreat to a safe distance before the explosion. Oxidation of 5-aminosalicylate is carried out in the presence of a catalyst, nitroferricyanide, which results in the formation of indosalicylate, a blue-colored compound. If conscious, drink several glasses of water or milk and induce vomiting 2. The total heat can be split into heats for each component in the system. Ask an Expert The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. Evacuate only if advised to do so by local authorities.
The examples are , present-day , , and. When it comes into contact with water, the polar water molecules interfere with those ions and eventually make them disperse. Practical Chemistry activities accompany and. Use proper respiratory protection to evacuate affected individuals to a safe area as soon as possible. The Hazards and Dangers of Ammonium Nitrate What is Ammonium Nitrate? Note: we recommend doing the measurements in triplicate. Thus, in theory, if we used a larger amount of water and added more teaspoons it will give the same or similar results.
Students should be able to predict qualitatively that the entropy change for the system has a positive value because a gas and a liquid are formed from two solids. . After any period of time the mixture will be a cooler temperature than that of a mixture with a larger quantity of water. Go indoors immediately and close all doors, windows, and openings. What should you do in the event of a local or regional spill? When a drop of water touches a small pile of this mixture, it instantly bursts into a blue-green flame, accompanied by a large cloud of smoke. How many moles of each substance were dissolved? It is predominantly used in as a high-nitrogen.
Turn on your radio or television to a local news station. The heat capacity of the calorimeter C cal is 153. There are many ways that groundwater can be contaminated, but most aren't nearly as detrimental as an increase in the amount of nitrates within our groundwater. Blending ammonium nitrate with certain other fertilizers can lower the critical relative humidity. Teaching notes It helps to use a large thermometer display. This should only be done under controlled, supervised conditions in a chemistry lab because ammonium nitrate can cause asphyxiation if too much of it is inhaled, and it can explode at high temperatures.
Ammonium nitrate dissolves in water with an endothermic reaction, a chemical reaction that consumes heat rather than releasing it. Therefore, it is important to store ammonium nitrate in a tightly sealed container. Make sure both are dry and mix slowly or the reaction may occur prematurely. It also caused America to loose its innocence of domestic terrorism. Should such an incident occur, there may be a visible cloud of ammonia, carbon dioxide and nitrogen oxides.