Lab Report for Experiment A5: Types of Reactions, Abraham Lincoln High School • OTHER other, Battle Ground High School • SCIENCE CHEMISTRY, Copyright © 2020. How can I identify 6 unknown solutions based on a lab done in class? for each of the possible combinations you. Examining what the following tests produce will identify the substance; The decomposition of silver nitrate produces elemental silver. lab and the safety officer has discovered some, How would you go about identifying which of the 4 chemicals it is? A link to the app was sent to your phone. Subscribe to Unlock. Course Hero is not sponsored or endorsed by any college or university. How can I identify 6 unknown solutions based on a lab done in class? During the second part, you will be given a set of nine solutions and asked to identify them by comparing their behavior when carrying out binary mixings with the observations that you made in the first part. If the the solution is neutral, or rather, the pH of the pure water, you have either AgNO3 or KCl. In chemistry I am Given 7 solutions,BaCl2, Na3PO4, Ca(OH)2, HCl, MnSO4, AgNO3, and Na2CO3. Explain some possible reasons for any discrepancies. Dissolve a sample of the unknown solid in water. Start here or give us a call: (312) 646-6365, You have been prepping for a chem. Decomposition of Salicylic acid by rapid heating produces  a white solid phenol and CO2 gas. For transition metals, we often use sodium hydroxide. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! IDENTIFYING UNKNOWN SOLUTIONS BACKGROUND: In this lab you will identify six unknown solutions by reacting them with each other. We were able to figure out the substances by taking steps and figuring out the certain substances. the ‘products’ will be the same as the ‘reactants’ for that combination. ) Measure the pH of pure water as a control (this is your neutral). You can identify some chemicals that are in an aqueous solution by adding additional chemicals and observing what precipitate forms. Mix vigorously and allow the solution to stand. Dissolve a sample in water, dip a Q-tip in the solution, place into the flame of a bunsen burner. A. Identification of Unknown Carbohydrate Samples. You have been prepping for a chem. You will need to make a numbered set of unknown pipets for each lab pair along with a … Give students the lab handout (see attached). Thermal Decomposition of Sodium Bicarbonate: Above 50 °C, sodium bicarbonate gradually becomes sodium carbonate, water and carbon dioxide. However, in order to complete this lab we must have some background knowledge. DISCUSSION In the daily work of a scientist, he or she often encounters situations in which an unknown substance must be identified. To confirm, test the sample for chloride by adding an aqueous solution of AgNO3: KCl(aq) + AgNO3(aq) -> AgCl(s) + KNO3(aq) To further confirm, perform a flame test with the unknown. This is probably NOT the answer you're supposed to give, but there's no need to actually make solutions in real life. The test was observed for any change and was recorded. About 1.00 ml of Molisch reagent then 1.00 ml of concentrated H2SO4 was added to each sample. Salicylic acid should glow greenish under a black light. Silver nitrate will leave brown stains on basically anything you wipe it up with, probably the floor would already be stained. Chapter 7 Exp #4, Identification of Unknown Solutions KEY - IDENTIFYING UNKNOWN SOLUTIONS BACKGROUND In this lab you will identify six unknown solutions, 1 out of 1 people found this document helpful, In this lab you will identify six unknown solutions by reacting them with each. , find answers and explanations to over 1.2 million textbook exercises for!! 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