The tag has no wiki summary.

learn more… | top users | synonyms

2
votes
1answer
40 views

Why is oxygen absorbed in a colorless alkaline solution of pyrogallol and why does it turn dark brown?

I'm reading about recognition and identification of gases. My book says: Oxygen is absorbed in colorless alkaline solution of pyrogallol and turns dark brown? I'd like to know why and how. ...
0
votes
1answer
21 views

What copper oxide is being created upon electrolysis?

Whenever using copper as anode, I end up with cyan dust that doesn't dissolve in water. What's that (presumably) oxide? Is it poisonous? Can I dissolve it in something to perform electroplating ...
0
votes
1answer
48 views

Naming an ensemble of compounds

As part of intern work I am running simulations on a group of compounds, but as it is I have little in the way of O-Chem experience and I wanted to be able to at least get some direction on naming ...
2
votes
1answer
83 views

Identifying 5 unknown substances

Please help me identify the following 5 substances; G, Y, T, L and J G is a white solid which is insoluble in water. Consider the following reactions carried out on solid G. Step 1: Excess dilute ...
3
votes
3answers
81 views

How to read a given chemical formula?

I'm trying to read this chemical formula but I'm a bit confused. I'm hoping that someone could help break this down for me to explain what the various parts mean. Someone purchased epigallocatechin in ...
2
votes
2answers
133 views

How to identify ionic compounds

I have a Chemistry lab in which I must design and carry out an experiment to determine the compound in each of eight numbered vials. Each vial contains one of these ionic compounds: BaCl2 CaCO3 ...
2
votes
1answer
206 views

What substance is used for staining brass?

While working at CNC engraving, I had at my disposal a small bottle of liquid used to stain brass for creating signs etc - engrave a writing, stain the engraving, then grind/polish the flat topmost ...
2
votes
3answers
304 views

How do we actually know the chemical structure of a compound?

If a compound is placed before you and you are asked to determine what it is and what it's structure is,how do you actually do that ? This might be a baby question for most of you but I am not from ...
3
votes
1answer
98 views

What is the best way to detect the presence of tear gas?

I realise that tear gas can be several different things (Pepper spray / CS Gas / CR gas, PAVA, etc) Is there a good way to detect some or any of these in the air? Ideally using an electronic sensor ...
2
votes
2answers
731 views

Electrolysis of molten Calcium Chloride: Identifying the product

I was trying to make Calcium metal by electrolyzing molten $CaCl_2$. I used a stainless steel spoon and a thick steel wire as electrodes. Then I attached them to a power supply. I placed some $CaCl_2$ ...
3
votes
3answers
742 views

Presumptive test for modafinil?

Given a sample that is probably modafinil plus common fillers, but could be fake, what reagent tests would best determine whether it contains modafinil? Assume a known-good sample for comparison. ...
1
vote
0answers
69 views

DNA qualitative analysis [closed]

Does DNA give positive tests for: Amides (using Hinsberg , isocarbonyl or any such test) Alcohols Phosphates (using the Ammonium Molybdate test)? I will be extracting DNA from fruits and ...
6
votes
1answer
450 views

Identifying a glass frosting chemical

I have purchased an "unknown" white coloured powder from the market which can frost glass objects. Here are some properties of this powder White in colour When mixed with HCL or water, it results in ...