Ammonium Chloride Synthesis and Decomposition Lab, Lab Reports of Chemistry

Download Ammonium Chloride Synthesis and Decomposition Lab and more Lab Reports Chemistry in PDF only on Docsity! Synthesis and Decomposition of NH4Cl Dr. Slotsky Chem I Reactions: NH3 + HCl → NH4Cl NH4Cl → NH3 + HCl Hazards: Household ammonia solution, NH3, is toxic by ingestion and inhalation and irritating to skin and eyes. If exposed, wash off immediately under cold running water. Hydrochloric acid, HCl, 2 M concentration (2 moles per Liter) is toxic by ingestion and inhalation and can burn skin and eyes. If exposed, wash off immediately under cold running water. Gloves and goggles must be worn at all times during this experiment. Procedure: Measure 30 mL of household ammonia solution (NH3 gas dissolved in water) into your beaker. Measure out an additional 80 mL of hydrochloric acid (HCl gas dissolved in water) into your other beaker. Slowly add the hydrochloric acid to the ammonia, and stir after each addition. After each addition, test the mixture by spotting your pH paper with your solution using the bamboo stick - you may use the same piece of pH paper many times. When the pH paper shows a hint of turning red, your addition is complete. Carefully boil down the reaction mixture. Leave a sharp spatula in there to ensure that the mixture does not boil over or 'bump'! When you begin to see solid form, remove the mixture from the heat with tongs. As it cools, it should crystallize out your NH4Cl product. Carefully pour off liquid to obtain your product. This is a SYNTHESIS reaction, as you have combined NH3 and HCl to form a larger compound. Turn your NH4Cl product in to your instructor! Leftover liquid and hydrochloric acid may be poured down the drain - run water to dilute the waste. Followup: Decompose some of your product, after it has dried, in a test tube over a Bunsen flame - your instructor will assist. This is a DECOMPOSITION reaction - the NH4Cl returns to the NH3 and HCl which it was originally made from. Note that the fumes of NH3 and HCl, once cooled, can recombine to form NH4Cl once again – the reaction is reversible. Continued on back →