2. The colorless solution of an unknown solid turned red litmus blue. No odor was noted upon adding NaOH. A gray-white precipitate formed upon adding AgNO, and a white precipitate formed upon adding Pb(NO),. The flame test gave a violet color, and bubbles formed after adding HCl. Identify the unknown from the list of possibilities in the Introduction to this experiment.

2. The colorless solution of an unknown solid turned red litmus blue. No odor was noted upon adding NaOH. A gray-white precipitate formed upon adding AgNO, and a white precipitate formed upon adding Pb(NO),. The flame test gave a violet color, and bubbles formed after adding HCl. Identify the unknown from the list of possibilities in the Introduction to this experiment.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 97AP

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The colorless solution of an unknown solid turned red litmus blue. No odor was noted upon adding NaOH. A gray-white precipitate formed upon adding AgNO3 and a white precipitate formed upon adding Pb(NO3)2 . The flame test gave a violet color, and bubbles formed after adding HCL. identify the unknown from the list of possibilities in the Introduction to this experiment
A. Separation of Ni²+ and Fe³+ from Zn²+ and Al³+ B. Test for Iron(III) Ion 17b 13b 11 11f C. Test for Nickel Ion E. Test for 17b Zinc Ion 13b D. Test for Aluminum Ion 17b The Next Step 11f To digest the precipitate: to make the precipitate more compact 11f The Experimental Procedure is written for a single reference solution. If you are simul- taneously identifying cations in both a reference solution and a test solution, adjust the procedure accordingly. If the test solution is a sample with an environmental origin, then gravity filter 10-15 mL before beginning the Experimental Procedure. Prepare the hot water bath for use in Parts A and D. 1. Separate the hydroxide precipitates from the amphoteric hydroxides. To 2 mL of the reference solution (in a small test tube) add 10 drops of 6 M NaOH (Caution!) (see Dry Lab 4.A). Centrifuge and save the precipitate. Test for complete precipita- tion (see Dry Lab 4.B) by adding several drops of 6 M NaOH to the supernatant. Decant the…
11. A 0.485 g sample containing chloride was titrated with 36.8 mL of 0.1060 M AgNO3 stock solution. Express the results of this analysis in:a) Percent by weight of Clb) Weight percent Cl2c) Percent by weight of CaCl2d) Weight percent of AlC13
15. Victoria added 6 M HCl to a sample of the unknown, containing at least one of the Group I cations. A large amount of light-colored precipitate formed. The precipitate was separated from the supernatant liquid and was found to be insoluble in hot water. The colorless supernatant liquid was separated from the precipitate and after cooling and adding K2CrO4, no precipitate resulted. The separated precipitate dissolved completely after adding 6M NH3. A white precipitate was formed, upon addition of 6M HNO3. What cation(s) may be present in the sample? a. Pb2+ b. Ag* c. Hg,2+ d. Ag*, Hg,2* e. Pb²*, Ag*
The volume of water needed to dissolve 0.0530 grams of silver hydroxide is 1 Assume no volume change upon addition of the solid. L.
Why do I keep getting 3.15 M for the part undelined in blue?
1. Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, CH3COOH. For 20.0 cm3 of the vinegar, 26.7 cm3of 0.60 mol dm-3 NaOH solution was required.What was the concentration of acetic acid in the vinegar if no other acid was present? (Thanks for your help) A. 0.45 mol dm-3B. 0.60 mol dm-3C. 0.80 mol dm-3D. 1.60 mol dm-3
What was done to ensure that there are no more chloride ions present in the precipitate? (A) Addition of more HCl and testing if the solution becomes acidic B Evaporation of the chloride ions by heating the precipitate in a crucible Filtration using an ashless filter paper to trap the chloride ions on the paper D Addition of AgNO, to the precipitate washings and checking if the washings become cloudy
Use the following information to answer the next question. A sample solution contains two unknown ions. A student did a series of tests on the solution, in the order listed below. If a precipitate formed at any stage, the mixture w filtered and further tests were done on the filtrate. The results are as follows. First test: solution is a pink colour Second test: NaIO3(aq) added and no precipitate forms Third test: flame colour is red Fourth test: NazCO3(aq) is added and no precipitate forms Two possible ions that the solution contains are a. lithium and cobalt(II) b. strontium and cobalt(II) c. lithium and manganese(II) d. strontium and manganese(II)
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A solution containing a mixture of metal cations was treated with dilute HCI and no precipitate formed. Next, H, S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H,S was again bubbled through the solution. A precipitate again formed and was filtered off. Finally, the solution was treated with a sodium carbonate solution, which resulted in no precipitation. Classify the metal ions based on whether they were definitely present, definitely absent, or whether it is possible they were present in the original mixture. Definitely present Definitely absent Possibly present Ag* Fe2+ Ba?+ Zn2+ Sn+ Mg2+ Lit Ph2+ Hg2+ Answer Bank
A solution containing a mixture of metal cations was treated with dilute HCl and no precipitate formed. Next, H, S was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and H, S was again bubbled through the solution. A precipitate again formed and was filtered off. Finally, the solution was treated with a sodium carbonate solution, which resulted in no precipitation. Classify the metal ions based on whether they were definitely present, definitely absent, or whether it is possible they were present in the original mixture. Definitely present Definitely absent Possibly present Answer Bank Hg3+ Pb2+ Lit Bj³+ Sn2+ Ni2+ A13+ Ag* Zn2+ Ba2+ Mg2+ Hg²+ Cu?+