Questions tagged [halogens]
The halogens tag has no usage guidance.
36
questions
21
votes
1
answer
4k
views
Why is the boiling point of fluorine lower than that of oxygen?
Fluorine boils at -188.1 °C and oxygen boils at -183 °C, but shouldn't $\ce{F2}$ boil after $\ce{O2}$?
Despite being electronegative elements, both are nonpolar molecules and posses dispersion forces ...
- 1,584
7
votes
3
answers
3k
views
Why do diluted sulfuric acid and hydrogen peroxide etch copper only when chloride ions are present?
I've mixed 30 ml 10% sulfuric acid with 20 ml 3% hydrogen peroxide and put a drop of this solution onto copper foil. The solution quickly removed the oxide layer from the copper but did not dissolve ...
- 191
7
votes
2
answers
2k
views
Why, out of the main halogens, is bromine the most soluble in water?
Why, out of the main halogens, is bromine $(\ce{Br2})$ the most soluble in water?
Why is there such a drastic decrease for iodine $(\ce{I2})?$
Here is a table from my inorganic chemistry textbook with ...
- 109
7
votes
2
answers
990
views
How to measure chlorine content using ORP sensor?
In my project I need to measure pH, turbidity, and chlorine level of treated drinking water. I found sensors for measuring pH, turbidity, and also chlorine.
The actual problem begins is that the cost ...
5
votes
2
answers
131
views
What words can I use to differentiate between cases where two atoms are of the same element versus when two atoms are of different elements?
I am writing my thesis, and usually I'm quite good with picking the right words for specific phenomena, yet I am having trouble finding the right words for this specific circumstance. I am trying to ...
- 1,247
4
votes
1
answer
152
views
Creating a chemical solution with water and chlorine
I bought a swimming pool for my kids and also a measurement instrument for measuring the amount of chlorine in the pool in mg/l. The problem is now that you have to calibrate the instrument before ...
- 41
3
votes
3
answers
535
views
Why chlorate(V) is one of the primary products of disproportionation reaction between chlorine gas and hot concentrated NaOH?
Cold diluted $\ce{NaOH}$ reacts with $\ce{Cl2}$ producing hypochlorite:
$$\ce{2 NaOH(aq, dil, cold) + Cl2(g) -> NaClO(aq) + NaCl(aq) + H2O(l)},\tag{R1}$$
whereas hot concentrated $\ce{NaOH}$ yields ...
- 53
3
votes
1
answer
119
views
Nickel salts from hypochlorites
(JUST A HEADS UP I’m 15 years old and new to chemistry) So I was recently looking around the house looking for products that I can extract chemicals from and I found a bottle of cleaning Vinegar ( 5% ...
3
votes
0
answers
289
views
What makes a good chlorinating agent?
From what I know, good inorganic chlorinating agents, $\ce{SOCl2, PCl3, PCl5}$ are able to substitute a poorer leaving group (like $\ce{OH-}$) for chlorine. For example, for substitution of the ...
- 387
2
votes
1
answer
290
views
Very Little Astatine
Astatine is the penultimate halogen in the periodic table with atomic number 85. It is very much radioactive and would vaporize itself by its own radioactivity before being collected. But there is ...
- 742
2
votes
2
answers
140
views
Is the electric conductivity of chlorine ions influenced by its oxidation state?
I'm a high school student researching the conductivity of electrolyte solutions. In this excerpt of the CRC Handbook, I noticed that different ions containing chlorine have different limiting molar ...
- 527
2
votes
1
answer
126
views
Reaction of 1,4-Dichlorobenzene & Hydroxylamine
I'm looking for reactions that would attack the chlorine in dichlorobenzenes. Wikipedia mentions a reaction with hydroxylamine, yet Googling, I haven't found exact said reaction. Can anyone provide it ...
- 302
1
vote
1
answer
462
views
Substitution or elimination when a chloroalkene reacts with NaOH in ethanol?
NaOH + EtOH will eliminate the Cl atom forming a double bond. At least, that's what I think. 3 could also be a viable answer since the OH can also attack the said double bond (this is probably not ...
- 13
1
vote
3
answers
357
views
How can chlorine be 'only' the third-most electronegative element yet have the highest electron affinity?
From Wikipedia:
It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity on the Pauling scale,...
- 1,795
1
vote
2
answers
5k
views
Naming and structure of PtCl4.2HCl (complex/coordination compound)
Given that $\ce{PtCl4.2HCl}$ when reacted with excess of $\ce{AgNO3}$ produced zero moles of $\ce{AgCl}$, I understand that all the chlorine atoms are inside the coordination sphere. But what will the ...
- 149