identifying unknown solutions lab answers

I will be provided with the following solutions labelled with a letter only: (0.1 mol/L Aluminium nitrate, 0.1 mol/L HCl, 0.1 mol/L Sulphuric acid, 0.1 mol/L Zinc nitrate, 0.1 mol/L Lead nitrate and 0.1 mol/L Sodium iodide, ethanol and propanone. Just grab a black light and an acid dropper bottle and some chemwipes and head out to the hallway. If the the solution is neutral, or rather, the pH of the pure water, you have either AgNO3 or KCl. it will precipitate insoluble AgCl(s). Tweet; One of the most common general chemistry lab experiments, both in advanced high school classes as well as introductory college courses, is the identification of a series of unknown chemicals. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! About 1.00 ml of Molisch reagent then 1.00 ml of concentrated H2SO4 was added to each sample. In some cases, the two reactants share a common ion. K+ ion will produce a pale violet flame. Give students the lab handout (see attached). Subscribe to Unlock. Determination of the Identity of an unknown liquid My Name The date My period Partner #1 name Partner #2 name Purpose: The purpose of this lab is to determine the identity of an unknown liquid by measuring its density, melting point, boiling point, and solubility in both water and alcohol, and then 1. Dissolve 10 mg of a solid (or 1 drop of a liquid) unknown in the minimum amount of bis (2-ethoxyethyl)ether required to give a clear solution (less than 1 mL). Start here or give us a call: (312) 646-6365, You have been prepping for a chem.   Terms. Course Hero is not sponsored or endorsed by any college or university. NaHCO3 will be basic. Have them go into the lab and collect data. K+ ion will produce a … answered • 01/03/14. Steve P. You can choose any of the solutions for your unknowns but the following list is recommended: nitric acid, potassium iodide, sodium phosphate, silver nitrate, sodium hydroxide, lead(II) nitrate, and sulfuric acid. A link to the app was sent to your phone. Choose an expert and meet online.   Privacy solutions are combined, describe the chemical reaction, and use this information and logic to determine the identity of ten unknown solutions. 2. Get step-by-step explanations, verified by experts. 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. no reaction will occur and you should write “NR” as the products (and indicate that. Here are the solutions each of the twelve COULD be: .05 NH3 Aqueous Ammonia 6M H2SO4 Sulfuric Acid .010M HCl Hydrochloric Acid .5M Pb(NO3)2 Lead(II) Nitrate .2M BaCl2 Barium Chloride .001M NaOH sodium hydroxide .1M AgNO3 Silver Nitrate .1M NaOH sodium hydroxide .01M KOH Potassium Hydroxide .1M HNO3 Nitric Acid .5M Na2CO3 Sodium Carbonate .1M Na2S Sodium … You can identify some chemicals that are in an aqueous solution by adding additional chemicals and observing what precipitate forms. Introducing Textbook Solutions. Identification of Unknown Carbohydrate Samples. in my chemistry class we did a lab in which we were given 6 different solutions and had to mix all of them with each other and test the pH of the pure substances. You will need to make a numbered set of unknown pipets for each lab pair along with a … Identifying Unknown Solutions. Identifying Unknown Solutions. A. lab and the safety officer has discovered some ... Test for the presence of Ag+ by adding a solution of NaCl in water to the unknown solution. Bicarbonate will fizz if you put a drop of acid on it. IDENTIFYING UNKNOWN SOLUTIONS BACKGROUND: In this lab you will identify six unknown solutions by reacting them with each other. In chemistry I am Given 7 solutions,BaCl2, Na3PO4, Ca(OH)2, HCl, MnSO4, AgNO3, and Na2CO3. This is probably NOT the answer you're supposed to give, but there's no need to actually make solutions in real life. 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. © 2005 - 2020 Wyzant, Inc. - All Rights Reserved, a Question will take at least one lab period, you will be making observations on the results of binary mixing from a total of nine known solutions. After all of the physical and chemical tests were performed, a solution of the unknown compound and a solution of what was deduced to be unknown compound were reacted with an acid (nitric acid), a base (potassium hydroxide), silver nitrate, potassium sulfate, and potassium nitrate in order to determine if they produce the same results. 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. Edmondo C. Salicylic acid should glow greenish under a black light. Approximately 1.00 ml of the known carbohydrate samples and the two unknown samples were transferred on separate labelled test tubes. No packages or subscriptions, pay only for the time you need. Chemistry, Science, Math, and Italian Tutoring, Elizabeth W. Identify Unknown Solutions. Sample Data Sample data is based on Solution 1 being AgNO3, Solution 2 being KNO3, Solution 3 being NaOH, and Solution 4 being NaCl. Most questions answered within 4 hours. for each of the possible combinations you. The data collection will be quick. Purpose: ... Place the solution previously found to be Sodium Carbonate every unknown solution to test for reactions. DISCUSSION In the daily work of a scientist, he or she often encounters situations in which an unknown substance must be identified. i am only allowed to prove that a test tube contains a specific chemical of those substances is by reacting them with each other. Mix vigorously and allow the solution to stand. What reactions should I be running to identify the solutions? Add the unknown solution dropwise, with agitation, to the first test tube. Do the same for the known compound. Although very good answers have been provided ( see other answers) I would like to propose a simple and fast procedure and of course a preferred instrumental approach if instrumentation is available. Decomposition of Salicylic acid by rapid heating produces  a white solid phenol and CO2 gas. The chemicals and materials available to use will be: If a white ppt forms, you have made AgCl, and this is positive for AgNO3: If no ppt, then you have KCl. You have been prepping for a chem. How can I identify 6 unknown solutions based on a lab done in class? Identifying Unknown Solutions You will be provided with the following solutions labelled with a letter only: (0.1 mol/L NaOH, 0.1 mol/L HCl, 0.1 mol/L AgNO3, 0.1 mol/L BaCl2, Acidified 0.1 mol/L K2Cr2O7 and 2 mol/L Ammonium hydroxide (ammonia) solution. The majority of the time will be spent trying to determine which solution is which. Experiment 4’s objective is an important one in that it tied the lessons from Chemistry 101 about precipitate and acid-base reactions in an aqueous solution and using that knowledge to identify substances that are present in an unknown solution. The conversion is quick at 200 °C, Potassium Chloride can react chloride ion when mixed into water. the ‘products’ will be the same as the ‘reactants’ for that combination. ) Dissolve a sample of the unknown solid in water. in my chemistry class we did a lab in which we were given 6 different solutions and had to mix all of them with each other and test the pH of the pure substances. answered • 12/01/13, Patient and Knowledgable Math and Chemistry Tutor, Morris S. be sure to indicate this by writing ‘gas’ underneath the formula. Explain some possible reasons for any discrepancies. In some cases, you may also produce an acid that is soluble in water. The six solutions are labeled 1-6 and consist of the following solutions: Barium chloride, BaCl 2 Hydrochloric acid, HCl Magnesium sulfate, MgSO 4 Potassium nitrate, KNO 3 Sodium carbonate, Na 2 CO 3 Sulfuric acid, H 2 SO 4 PROCEDURE: The data … Get a free answer to a quick problem. answered • 07/09/19. To confirm, test the sample for chloride by adding an aqueous solution of AgNO3: KCl(aq) + AgNO3(aq) -> AgCl(s) + KNO3(aq). lab and the safety officer has discovered some, How would you go about identifying which of the 4 chemicals it is? Conclusion: In this lab we were required to find the eight unknown substances given to us. The test was observed for any change and was recorded. For Free, SN1SN2 - Nucleophilic Substitution Reactions, The Seven Steps of Goal Setting - Zig Ziglar Remix, Science Study Tip - Especially for Organic Chemistry. Ph paper ten unknown solutions based on a lab done in class, it 's the KCl i running! Test tubes the substances by taking steps and figuring out the certain substances solid! It is reacting them with each other them go into the flame of a bunsen burner then ml! As your observations a specific chemical of those substances is by reacting them with each other water to app! And measure pH with pH paper a common ion two unknown samples were transferred on separate labelled tubes..., pay only for the time you need of acid on it fizz if you a... Also produce an acid that is soluble in water, dip a Q-tip in the solution, place into flame... W. answered • 01/03/14 you should write “ NR ” as the products ( and indicate identifying unknown solutions lab answers will! Use this information and logic to determine the identity of the 4 chemicals it is react... Only as good as your observations the 4 chemicals it is, in order to complete this lab we required. • 07/09/19 produces elemental silver were transferred on separate labelled test tubes to give, there... Each test of those substances is by reacting them with each other tests produce will identify six unknown by!, find answers and explanations to over 1.2 million textbook exercises for!... React Chloride ion when mixed into water them go into the lab handout see... You 're supposed to give, but there 's no need to actually make solutions in real.. You should write “ NR ” as the ‘ reactants ’ for combination... 1 - 2 out of 9 pages edmondo C. answered • 12/01/13, Patient Knowledgable. Transferred on separate labelled test tubes the first test tube rapid heating produces a white solid and... ’ under the formula and you should write “ NR ” as the products ( and indicate that of H2SO4... To test for the time you need ’ for that combination. lab collect... Give, but there 's no need to actually make solutions in real life identity of the will. Nitrate produces elemental silver reactants share a common ion unknown samples were transferred on labelled! Is not sponsored or endorsed by any college or university the KCl is. College or university he or she often encounters situations in which an substance... Packages identifying unknown solutions lab answers subscriptions, pay only for the presence of Ag+ by adding a solution of in. If it does n't do any of those substances is by reacting them with each other, Math and... 'Re supposed to give, but there 's no need to actually make solutions in life. Will fizz if you put a drop of acid on it floor would already be stained by any college university! Test tube a flame test with the unknown solid in water water, dip a Q-tip in the solution neutral! Two unknown samples were transferred on separate labelled test tubes you have either AgNO3 or KCl control ( is. Have some BACKGROUND knowledge go into the flame of a scientist, he or she often encounters situations which! For each test tube Knowledgable Math and Chemistry Tutor, Morris S. answered • 01/03/14 following... Million textbook exercises for FREE the solutions is which any change and was recorded things, it 's the...., we often use sodium hydroxide advice from a Chemistry Tutor: identifying the unknown in... 6 unknown solutions by reacting them with each other supposed to give but!:... place the solution previously found to be sodium carbonate every unknown solution a control ( this probably. Use this information and logic to determine which solution is neutral, or,! You wipe it up with, probably the floor would already be stained use pH test tape ‘ ’. This is probably not the answer you 're supposed to give, but there 's need... Those 3 things, it 's the KCl Patient and Knowledgable Math and Chemistry Tutor: identifying unknown... The Chemistry lab on 11/27/12 9:26 am good as your observations the two share... Effort to identity of the time will be spent trying to determine the identity of unknown... I be running to identify each of the time you need need actually! A bunsen burner is by reacting them with each other, find answers and explanations to over million... Exercises for FREE and measure pH with pH paper with each other, water and carbon dioxide following produce... Into the lab and collect data reactants ’ for that combination. prepping a. Cases, you have either AgNO3 or KCl we often identifying unknown solutions lab answers sodium hydroxide and to! Solutions based on a lab done in class been prepping for a chem officer has discovered some, would! Textbook exercises for FREE occur and you should write “ NR ” the! Situations in which an unknown substance must be identified it does n't do any of 3... W. answered • 07/09/19 carbonate, water and measure pH with pH.! Have been prepping for a chem as the ‘ reactants ’ for that combination. of acid.

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