Question

This lab is the ten test tube mystery The ten solutions are as followed:

1: ammonium chloride, NH4Cl

2:barium chloride, BaCl2

3:copper sulfate, CuSO4

4:salt hydrochloric acid, HCl

5:potassium iodide, KI

6:silver nitrate, AgNO3

7:salt sodium bromide, NaBr

8:sodium hydroxide, NaOH

9:sodium sulfide, Na2S

10:sulfuric acid, H2SO4

I am just totally lost as it wants me to test all the reactions and say which solution is what, if you could please just answer which solution goes where and possibly fill out the table for me.

LD BE RECORDED IN LAB NOTEBOOK. TA PLE Any key can be used to record your data as long as there is a legend included so that others can understand the results of the test. Some suggestions for the key: No reaction NR Color of precipitate- color PPT (i.e., white PPT) Data Analysis Make sure to show all of your calculations in your lab notebook as a record of how you completed your calculations. Don't forget to include your units and correct number of significant figures! Then, go onto Chem21 and report your results.Any evidence must be based on data you collected Please note that if I wrote "copper sulfate reacts with barium chloride to produce solid barium sul fate," this would be the same thing as given in part a of the example. For your explanations, you need two different pieces of evidence. and reported in your lab notebook and worksheet. 1. Identify each of the ten solutions. 2. Explain how you identified each solution. Each identification should have at least two different pieces of supporting evidence and/ or reactions to make your case. The net ionic equation for the reaction must be shown sepa rate from your two pieces of evidence: Identification Solution Z is Number 3 (CuSO) in the un known key Explanation: a. Cuso,(aq) + Bacl2(aq) → BaSO4(s) + CuCl2(aq) b. Copper sulfate solutions are blue Net ionic reaction: so,2-(aq) + Ba2+ (aq) → BaSO4(s)

Answer 1

1. NH4Cl has NH4+ as its cation. Take the solution and heat it with NaOH if ammonia gas is evolved which is conformed by its pungent smell we can confirm that the salt is NH4Cl
2.BaCl2
Take the solution and add ammonium Carbonate, if a white precipitate (soluble in acetic acid) is a Ba+2 might be present.
To further conform Ba+2 ,take the sample solution and add potassium chromate. if a yellow precipitate if formed Ba+ 2 can be conformed.
3.CuSO4
Take the sample solution and add NaOH to it if a blue Precipitate (Cu(OH)2) is formed. The precipitate formed is soluble in ammonia and gives a deep blue solution. For further conformation acidify the blue colored solution and add potassium ferrocynide. If a chocolate brown precipitate is formed Cu2+ is conformed.
4.Add silver nitrate solution to the test solution in a test tube and observe the reaction. If a white precipitate forms, hydrochloric acid is present
5.Add H2SO4 to the solution if violet vapours of iodine are formed, KI can be conformed.
6. AgNO3
Take the sample solution and add HCl to it, AgCl a white precipitate is formed. The precipitate is soluble in ammonium Hydroxide.
To further conform, add KI to the solution if a yellow precipitate (AgI) is formed, AgNO3 is conformed.
7.NaBr
Add concentrated H2SO4 to solution and heat it if reddish brown vapours are formed we could conform the presence of Br-ions.
8.NaOH
It is the only base present. If the litmus paper turns blue NaOH can be conformed.
9.Na2S
Take the salt solution and add dilute HCl. If a rotten egg smell is observed it could be Na2S.
To further conform moisten a piece of filter paper with lead acetate solution and place it on the mouth of the test tube. If it turns black Na2S is conformed.
10. add NaCl to the solution and heat it .if a greenish yellow gas with a pungent smell appears H2SO4 can be conformed.