During today’s chemistry lab we did a series of experiments that resulted in various chemical reactions and equations. We conducted trials involving calcium metal and water, sodium carbonate and hydrochloric acid, and the decomposition of hydrogen peroxide. We then administered a flame test which helped us determine and prove the particular gases which the reactions produced.

Calcium Metal and Water

During our first experiment we combined water with calcium metal, producing a hydrogen gas and a cloudy white precipitate of calcium hydroxide. Afterwards, we trapped the gas and did a flame test. We took an ignited splint near the trapped gas and it caused a loud explosion and a release of heat. Mixtures of hydrogen gas and oxygen do not react unless they are inflamed, in which case the result is a fire or explosion with a characteristic reddish flame whose only products are water.

Calcium Metal and Water Experiment Reaction 

Hydrogen Peroxide and Potassium Iodide

In the second experiment we tested the reaction between hydrogen peroxide and potassium iodide. After combining the two substances, we placed a glowing splint in the sample tube which caused the embers to reignite. It is very important to remember that all fires need three things to burn: heat, fuel and oxygen. During this process the potassium iodide acts as a catalyst in the decomposition of hydrogen peroxide into water and oxygen gas, which fuels the flame. It also created a distinguished popping sound, caused by the speed that the heat and oxygen molecules reacted with one another.

Hydrogen Peroxide and Potassium Iodide Experiment Reaction

Sodium Carbonate and Hydrochloric Acid

Finally, in the last experiment we were testing for carbon dioxide. We achieved this by combining sodium carbonate and hydrochloric acid and producing carbon dioxide. We then placed a flame in the sample tube, causing the fire to extinguish. Combustion is a chemical reaction in which a fuel reacts with oxygen to produce light and heat.  In the absence of an oxidant, such as in pure carbon dioxide, combustion ceases.

Sodium Peroxide and Potassium Iodide Experiment Reaction 

I believe that it is very important to know the different interactions between flames and gases in everyday life.  This knowledge will help you be safe and take necessary precautions to prevent fires from occurring and spreading. This experiment was very insightful and allowed me to develop a better understand between different chemical interactions.