Here are my notes for the liquid unknown based on my observations and some tests

Question

Here are my notes for the liquid unknown based on my observations and some tests I ran;

-Clear liquid

-Strong odor

-Not soluble in water, NaOH, or HCl.

-Soluble in H2SO4. Turned a redish brown color when dissolved in H2SO4. Also gave off heat.

- Successful positive for the multiple bonds test. Added more than 20+ drops of bromines, and the solution still changed back to a cloudy white every time.

-Negative ferrous hydroxide test. Turned a swmapy green color.

-Ran a 2,4-dinitrophenylhydrazine test.The results say a yellow precipitate should form if the test is positive. But when I ran the test on the liquid, it became a chunky liquid with a yellow color. I don't know if that's a positive test or not though.

-Silver nitrate test on the liquid was negative.

-Cerium IV test on liquid showed there no color change.

-Ferric Hydroxamate test on the liquid was I think positive because it did become a dark-red color, but that was after I added a lot of FeCl3, so Im not completely sure.

-Did not create carbon dioxide bubbles in sodium bicarbonate.

-The liquid also has a pH of about 7. ?

Here are my notes for solid unknown, based on my observations and some tests I ran. Im not sure if youll be able to identify what this is based on just my notes, so please give me your best guess going what I have so far, and suggest some tests I should perform to further determine what it is.

-Pale yellow color

-Fine powder, but also clumpy. Similar consistancy to corn starch.

-Not soluble in water, NaOH, or HCl.

-Soluble in H2SO4. Turned a golden yellow color when dissolved in H2S04. Also gave off heat.

-Negative multiple bonds test. Changed to the red color of bromine after a few drops and stayed red.

-Negative ferrous hydroxide test. Turned a swampy green color.

-Ran a 2,4-dinitrophenylhydrazine test. The results say a yellow precipitate should form if the test is positive. But when I ran the test on the solid, it became a curry-orange colored liquid. I don't know if that's a positive test or not though.

-Cerium IV test on the solid showed there was no color change. Solid did appear to have carbon dioxide bubbles evolve?

-Did not create carbon dioxide bubbles in sodium bicarbonate.

-Melting Point: About 104-108

Explanation / Answer

1)

- Compound insoluble in watre, NaOH and HCl but soluble in H2SO4: alkene, alcohol, aldehyde or ketone

- Br2 +ve: compound is unsaturated

- Ferrric hydroxide is -ve: no NO2 gp

- 2,4DNP is +ve: may be aldehyde or ketone

- AgNO)3 is -ve: no alkyl halide

- Ce (IV) is -ve: no OH gp

- Ferric hydroximate is +ve: may be ester

From the IR spectra there are 2 peaks in the 3000cm-1 region, this is characteristic of CHO gp.

therefore the liquid is an unsaturated aldehyde

2) Insufficient information on the solid. Most likely a saturated compound.

-

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