For questions relating to water (H2O), specifically its structure, properties, and uses in chemistry.

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9 views

Using Hydrates as a skin moisturizer

I suffer from a rare skin condition called Ichthyosis and was just in my AP Chemistry class earlier today learning about hydrates and their properties. It occurred to me that a compound with so much ...
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0answers
10 views

How to produce hot water-soluble soap balls? What is their chemical background? What about medical capsules?

There are water-soluble balls for soap baths. Then there are medical capsules that disappear in mouth. Is it possible do this kind of capsules and water-soluble containers at home? If not, what do I ...
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1answer
264 views

What is the bond angle of H2O?

I have been trying to find out the bond angle of H2O, but every site I visit has a different answer. So far, I have found the following angles listed: Site 1: 104.4º Site 2: 107.5º OR 104.5º, ...
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2answers
168 views

How much does water expand when heated, and does salt affect that?

For this question, assume all things not mentioned are perfectly controlled, all at 14.7lbs of atmospheric pressure, and water is 100% pure of anything not mentioned, with no dissolved air. Given a ...
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1answer
64 views

Chlorination of Water

Does passing chlorine gas through water form hydrochloric acid or bleach? Also, will a mixture of hydrogen and chlorine gas from electrolysis of brine do the same?
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1answer
31 views

Reaction of distilled water with hard water

This question seems silly, but this just came in my mind while i was learning Hydrogen. Means will there be any reaction when $\ce{H2O}$will react with $\ce{D2O}$..
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0answers
21 views
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21 views

Analytically combining Dynamic Equilibria that have a two way affect?

Lets say I want to model a water system as the following set of equilibria: $\ce{H2O <=> OH- + H3O+}$ | $\ce{A=[OH^{-}][H3O+]}$ $\ce{CO2 + H2O <=> H2CO3}$ | ...
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1answer
23 views

How much water would one loose if one burns hydrogen and oxygen?

By using electrolysis one can separate hydrogen and oxygen, but when burning hydrogen and oxygen together steam is released, therefore creating water. My question is: how much of the original ...
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1answer
24 views

tap water and distilled water for electrolysis

my water electrolyzer which I've built using this pdf, produces less gas than I expected. In that file the author insists on using distilled water instead of tap water and I have used tap water. would ...
2
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1answer
374 views

How can I identify whether a substance is KOH or NaOH?

I've bought NaOH or KOH (I don't remember which one!) for my electrolyzer and I've tested it. Now I want to improve its performance and I was searching for a better electrolyte when I realized I've ...
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1answer
56 views

calculate the amount of energy in KJ necessary to convert 346 g of liquid water from 0 C to water vapor at 182 C

Calculate the amount of energy in $\mathrm{KJ}$ necessary to convert $346~\mathrm{g}$ of liquid water from $0~^\circ\mathrm{C}$ to water vapor at $182~^\circ\mathrm{C}$. The correct answer is ...
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2answers
52 views

Are non-ionic compounds generally as dehydrating as ionic compounds in drinking water?

In order to turn sea water into drinkable water, virtually all of the salt must be removed. By definition, salts are ionic compounds. I am assuming that there are other non-ionic compounds devolved ...
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0answers
68 views

What stable arrangements of hydrogen-bonded water exist in the range of 4-20 water molecules?

Water clusters made up of various numbers of water molecules have been described. Are all of these structures theoretical? What experimental evidence supports any of these structures? How does the ...
2
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1answer
15 views

High/low density water solution values

I would like to know what min and max values of densities are achievable with water solutions. There are some conditions: 1. Normal or close to normal temperature; 2. Non-radioactive ...
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2answers
56 views

How can the density of water be maximised?

What is the maximum possible density of water at room temperature? The density of the water in the dead sea at 37 Celsius is 1.24. Would it be possible to increase density as such using salts we add ...
3
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1answer
40 views

Ethanol and water hygroscopic equilibrium concentration

I am working with a company to help improve their reaction process where they use SDA 2B Alcohol (Karl Fischer titration has it at 99.66% EtOH, 0.3375% toluene). Specifically, I am attempting to ...
2
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1answer
34 views

Can electrolyzing ice cause an explosion?

I know electrolyzing water separates it into hydrogen and oxygen. However, I am curious, if ice is electrolyzed, could it explode? My thought process is that oxygen and hydrogen bubbles would build ...
2
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2answers
71 views

Can water be produced by mixing hydrogen gas and oxygen?

Could there be some kind of process, a kind of "retrograde electrolysis" where hydrogen gas (or in some other form) and oxygen gas (or in some there form) are mixed with required energy to combine to ...
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1answer
73 views

Is there a readily available liquid that's more dense than water and insoluble?

I am looking for any liquid that does not dissolve in water with higher density and does not react with water, one that is readily available.
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1answer
268 views

Soap and rain water, why does it not rinse off?

I am in Papua New Guinea at the moment, where rain water harvesting is the most common way of getting water. When washing hands, the soap feels hard to rinse off, and my skin feels "greasy". I read ...
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0answers
18 views

What is electrodialysis and is electrolysis prevented or suppressed?

Recently, I was introduced to a method of desalinization called electrodialysis in which a current was applied to salt water in such a way that the positive and negative were separated and drawn ...
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1answer
35 views

Which acids are created by the combination of a gas and water?

Which acids are created by the combination of a gas and water? I know that carbonic acid is created by combining carbon dioxide and water, but are there others? Is there a specific name for this ...
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1answer
42 views

Solar still and how it works

I use a solar still that holds 182 cubic feet of water. Here is how it works: There is an insulator on both sides of the metal bowl. On the outside it covers the whole thing. on the inside it covers ...
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1answer
47 views

What are the methods of fluoride removal from drinking water?

I would like to remove fluoride from my water supply. Are there any methods, any test kits or water distillation units to remove fluoride from drinking water? See also: Is there any at home test ...
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1answer
25 views

How to test for fluoride levels in drinking water?

I would like to test for fluoride levels in the water. Are there any methods or test kits available to test the levels of fluoride in home water supply? See also: Is there any at home test for ...
5
votes
1answer
92 views

Rusting of an Iron nail at oil water boundary surface

Recently at school, I did some experiments on corrosion. Everything mostly went as expected, but the result in one of the test was quite baffling. This test had an iron nail in water with some of ...
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0answers
39 views

How to determine amount of CO₂ in soda water

I've got a problem in determining the amount of $\ce{CO2}$ in soda water. Basically, I have boiled some purified water to remove the dissolved gas. By using a SodaStream machine, I made carbonated ...
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1answer
38 views

Can I perform electrolysis without electrolyte? (with distilled water)

When performing electrolysis at home, I usually used salt water as electrolyte. The problem is, that this method also produces chlorine and chlorine is aggressive to both humans and electrical ...
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1answer
22 views

Double Deionized Water and Superheating

I was told that dd-water will superheat when heated up in a microwave because of a lack of ions. 1) Doesn't water auto-ionize? I asked this; the answer was it auto-ionizes "too slowly" in dd-water ...
4
votes
2answers
93 views

What is the reason for anomalous expansion of water?

What is the reason for anomalous expansion of water? Why don't it simply expands on heating or contract on cooling. Why it shows anomalous behavior at 4 degree centigrade? Why not on 4,6 or 10 (or ...
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1answer
27 views

Behaviour of water at exactly 0°C

If I had a beaker of water (i.e. many molecules), at exactly $0^{\circ}C$ and at atmospheric pressure, what phase would be encountered? And would the answer to this also apply to other substances at ...
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1answer
29 views

Hydrate questions

Two questions that I'm really stuck on: A sample of cobalt(II) nitrate hydrate was heated to remove all the water of hydration. The hydrate was found to be 65.96% oxygen. Calculate the number of ...
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0answers
39 views

Specific Heat of Water Solution

If we add an ionic solute to water, will the specific heat of the water be increased or decreased? I understand that the specific heat is a measure of how much energy we must add to water for the ...
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2answers
26 views

Water purification procedure that does not involve a flocculant of any kind?

I have read about "electroflocculation" that uses less flocculant/alum, but is there a method – no matter how expensive or impractical – that uses no flocculant at all?
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2answers
54 views

What's the Acid Ionization Constant of the Hydrogen Proton?

What is the $\ce{K_{a}}$ value for $\ce{H^+}$. I understand that the hydrogen proton doesn't stick around in solution by itself for very long. Nonetheless, does it have a $\ce{K_{a}}$ value? Can it ...
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3answers
3k views

Why doesn't a table sublimate, while ice does?

A table does not sublimate, and nor does a spoon. Ice does, however. What is the fundamental difference?
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0answers
70 views

How to break down soap and detergents?

I am building a greywater harvesting system. I have all of it designed except one aspect. It is a 3 phase system. The first phase breaks down soap and detergents. The second phase filters the water. ...
4
votes
2answers
126 views

How can we rationalise the amount of crystal water in coordination complexes?

I was wondering why specific number of water molecules are attached to salts like $\ce{CuSO4.5H2O}$? Searching gave me a satisfying picture : I think $\ce{FeSO4.7H2O}$ should have a similar ...
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3answers
115 views

Why 1-octanol is immiscible with water?

Octan-1-ol is polar due to the presence of the $\ce{-OH}$ group, but it is immiscible with water. How is it possible?
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1answer
258 views

Why does the water in a Powerade bottle tastes a little like Powerade after many refills?

I have a bottle of Powerade and after probably around 20+ refills of water, the new water I put in still tastes/smells a little like Powerade. How does that happen?
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2answers
100 views

How can water be electrolysed if it's not ionic compound?

The electrodes have different charges. One is positive ( the cathode ) while one is negative (anode). They will attract the particles in the solution which are charged. Hydrogen to the cathode ...
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1answer
144 views

Why does water volume decrease when salt is added?

help me to know the reason why does water volume decrease when salt is added? our teacher asks us in the class but I don't find any strong reason.please help me.
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2answers
68 views

Configuration of a water molecule?

Water molecules are described as an oxygen atom covalently (ignoring for the monent protonization/deprotonization) bonded to two hydrogen atoms with an angle of ~104° between the hydrogen atoms (like ...
3
votes
1answer
79 views

Instantly seperate oil and water

I have a solution of water and oil mixed to as much as possible, since they won't actually mix. The supply is coming down a pipe at a relatively fast rate and I need to separate it so that the water ...
0
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1answer
31 views

What happens to water under high pressures without possibility of escape?

Knowing very little about the nature of water, wondering how it might behave at the centre of a planet or centre of an another massive gravitational body. Could water take such pressures or might it ...
3
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1answer
74 views

Time taken in changing surface tension

I had read some where that in glasses the surface tension is high, but in a lota the surface tension is low. My question how much time does the surface tension take to change? I mean that there was ...
2
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1answer
173 views

Yama Cold Brew Tower: what are these lab parts / components?

When viewing this on a shopping web site, one of the reviewers indicates "This is about 50-60 [dollars] worth of pyrex glass and another 20 [dollars] worth of wood." The company charges $499 for this ...
3
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1answer
71 views

Most common material in the universe

I was told that 'water' was the most common material in the universe and I disputed that claim. I was met with the argument that hydrogen and oxygen were the most common atoms in the world so water ...
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5answers
5k views

Does water really 'go bad' after a couple of days?

Among my friends it is a sort of 'common wisdom' that you should throw away water after a couple of days if it was taken from the tap and stored in a bottle outside the fridge, because it has 'gone ...