For questions relating to water (H2O), specifically its structure, properties, and uses in chemistry.
2
votes
1answer
44 views
What is the highest the boiling point of water can be raised?
As I understand it, the boiling point elevation in a particular solvent (in this case water) is a function of a particular constant of that solvent, and the molality of a dissolved substance. In turn, ...
1
vote
0answers
24 views
How do xanthan gum and other hydrocolloids work?
Does anyone know what causes things like xanthan gum to make water into a slimy substance on the molecular level?
0
votes
1answer
47 views
How much ascorbate to neutralize one liter of chlorinated tap water?
In Las Palmas de Gran Canaria, tap water is chlorinated. In an Internet forum, someone claims that in 2008 the water had a chlorine concentration of 0,5 - 1mg/l. On the official site of Emalsa, the ...
3
votes
1answer
121 views
If electrolysis splits water, why does only either hydrogen or oxygen (but not both) bubble up on one pole?
If electrolysis splits water, then that means that $\ce{H2O}$ is split into $\ce{H}$ and $\ce{OH}$ or $\ce{O}$.
How come that if a water molecule is split at e.g. the negative pole (anode), only the ...
1
vote
2answers
80 views
What are the factors behind making ice faster?
Recently I saw a video in YouTube about how to make ice in seconds.
In this video, salt is added to a glass of water and then a straw is closed from one end and the other side is lit using a lighter ...
1
vote
1answer
54 views
Solid hydrophilic transparant materials that don't dissolve in water
I am looking for hydrophilic transparant materials which are solid at room temperature and that don't dissolve in water. I need these for an experiment in which I condense droplets on a plate made out ...
3
votes
0answers
39 views
Do I really need 4 different water treatment systems with this water analysis?
We installed an artesian well and we had some surprises.
We asked a few places around and they all told me that we needed 4 different systems to solve our water problem. I am ready to accept this fact ...
3
votes
2answers
115 views
What is the product when Lithium solid is dropped in water?
I am working on reaction predictions for the AP Chemistry and I need some help with this problem. On a practice quiz I tried to use the rule of "Metal + Water = Metal Oxide" so I answered with ...
1
vote
0answers
46 views
Selectivity Coefficients of Ion Exchange Resins - Selectivity Reversal with TDS / Ionic Strength
I'm currently studying ion exchange resins and generally getting a bit stuck on some points of information which I do not fully understand / are not very well explained within the literature.
I ...
2
votes
1answer
51 views
Why does water become less dense when it cools
Most materials become more dense as they cool, but ice floats in water, meaning that it's less dense. Why is this?
3
votes
2answers
276 views
White powder observed after boiling water in electric kettle for many weeks
I used my water kettle (metal ones, not the plastic ones) to boil my water. Usually, if I did not consume all the water in the kettle and the water was cold, I usually topup extra water to the kettle ...
4
votes
1answer
107 views
Why isn't water acidic?
The definition of an acid is a compound with a negatively charged hydroxide group, and water is a hydroxide bonded to a hydrogen atom. This hydroxide has a net negative charge, too, since the negative ...
5
votes
1answer
128 views
Why does nucleophilic substitution favour being in an aqueous solution?
The two broad a halogen can leave a haloalkane are nulceophilic substitution and elimination reactions.
I was told that elimination reactions (that form a double bond as a $H^+$ is another leaving ...
-2
votes
1answer
43 views
Could someone explain the photolysis of water? [closed]
Could someone please describe the photolysis of water?
1
vote
1answer
39 views
Clarification on Photodissociation
Can someone please explain what photodissociation is and if it is more efficient than electrolysis while splitting water into its components?
Thanks in advance.
2
votes
1answer
70 views
Bent molecular geometry of water
Could you please explain how the bent molecular geometry of water is due to hydrogen bonding? I was under the impression that it was because of the lone pairs (VSEPR Theory).
2
votes
1answer
98 views
How can I produce hydrogen gas efficiently and cheaply?
I have been intrigued by one of the principles of chemistry lately- electrolysis. In my knowledge, electrolysis is a quite dangerous operation as the decomposition of water produces hydrogen and ...
2
votes
2answers
172 views
Why water can't mix with oil or cooking oil?
Why water can't mix with oil or cooking oil (both saturated and unsaturated)?
3
votes
2answers
95 views
Is electrochemically activated water a real technology?
In essence what I'm asking is if the applications of Electrochemically activated water (ECA water) as a bactericidal-disinfectant is real and profitable (especially this last part). The principle at ...
1
vote
0answers
23 views
Difference in Pitch Caused by Water Temperature [closed]
I have recently been intrigued by the following question:
What is the difference between the pitch of the noise of dripping water between hot and cold water? For example, would cold water create a ...
3
votes
1answer
96 views
Extraction of hydrogen and oxygen from water
The apparatus that I am using is a glass container, with two electrodes,two glass cylinders, water, and a battery. In the glass container will be filled with water and two electrodes kept inside the ...
4
votes
1answer
697 views
What is the difference between distilled water and rainwater?
I am studying different means of collecting water for consumption. From resources available on Internet, I understand that distilled water is not advised for regular consumption because of the lack of ...
7
votes
1answer
223 views
What is deuterium-depleted water actually used for?
I noted, flipping through the paperback Alfa Aesar catalogue today, that they sell deuterium-depleted water. Under the usage category, they list 'NMR'. I'm trying to work out what specific use this ...
1
vote
1answer
83 views
Is there a household method to decolorize potentially contaminated water?
I am living in my dorms at the moment and apparently it is an accepted thing that the water in the building is brown and yellow. According to my RA, this is a characteristic of the town I live in.
...
3
votes
0answers
31 views
Compounds that vary water's superheated and supercritical limits
Are there any compounds that reduce water's sensitivity to extreme heat change and/or volatility to high heat (over 800 degrees Fahrenheit), whether organic or inorganic?
7
votes
4answers
154 views
Is there a simple field test for heavy water?
Thought experiment
Given two glasses of water, how would one detect which glass contains heavy water, and which contains potable water without using complicated laboratory equipment?
Something like ...
3
votes
1answer
100 views
Is there a way to calculate how fast water will cool?
Is there a way to calculate how fast water will cool if you know the water's starting temperature and temperature of the environment that you put it in, such as a freezer?
4
votes
3answers
355 views
Methane seems to dissolve more readily in cold water. Why?
http://www.watertechonline.com/drinking-water/article/the-fine-points-of-methane-removal
When you are diluting air in the system and/or properly evacuating it, you must consider water temperature. ...
5
votes
1answer
184 views
Isolating salt from sea water using filters
Could a filter be used to isolating salt from sea water? Could we say that the water molecules are smaller than the molecules of salt dissolved in the water. I have no relation to chemistry or ...
4
votes
1answer
229 views
Water electrolysis
I did a short experiment in which I connected a 1.5v battery with 2 paper clips into a bowl of water to which I added salt. After a while, I saw a yellowish-greenish cloud inside the water around one ...
11
votes
2answers
832 views
Why is distillation not a viable way to seperate ammonia from water?
Since the steam pressure of ammonia is higher than that of water, I would expect distillation to be a reasonable way of seperating a mixture of both.
However, in industrial applications known to me ...
