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

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2
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1answer
19 views

What determines humidity limit / dew point of the air? - Why can air only hold a certain amount of water?

From Wikipedia: The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid water at the same rate at which it evaporates. At ...
4
votes
2answers
275 views

Why does water change phase so easily?

I did some undergraduate level Chemistry as part of my degree. It left me with the distinct impression that the polarity of water is responsible for its unusual phase properties: it's the only ...
1
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0answers
58 views

What compound can give off heat when it comes in contact with ice?

What compound is able to produce heat when it comes in contact with ice? The compound has to be able to produce heat multiple times. I was thinking of a compound that is similar to Calcium Chloride. ...
0
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3answers
62 views

Thought Experiment on Boiling

In this thought experiment, let’s consider the surrounding to be air that is composed of entirely water vapor (no other species like $\ce{O2}$ and $\ce{N2}$ are present). The surrounding is infinitely ...
0
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1answer
33 views

ph & pOH - Autoionization of Water

So I was learning about pH and pOH and it made sense. I looked at strong, weak acids & bases and learned that they dissociate completely in water. So then I moved on to water and learned about the ...
0
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2answers
33 views

How does this method of calculating the water equivalent of a calorimeter work?

I am doing a AP Chemistry lab in which we determine the heat capacity of a calorimeter (a concept that seems like it should depend on a lot more than just the calorimeter.) We have to calorimeters ...
4
votes
1answer
586 views

Drying Clothes Outside Below Freezing

It is commonly accepted that you can hang your wet clothes outside to dry even when the winter temperature is below freezing. It is mentioned here ...
2
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1answer
59 views

Volume of 1 Mole of Liquid Water

I am doing some rough calculations to test my understanding of elementary chemistry. In what follows, I calculate the volume of one mole of liquid water at about $4~^\circ\mathrm{C}$ and ...
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1answer
30 views

How can concrete set underwater?

I'm about to teach concrete to some high school children. I'm not a chemist but as I understand it the limestone cycle is this: ...
0
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1answer
34 views

Chemical Composition Changes in Liquids

Water is $\ce{H2O}$ in all it's states: solid(ice), liquid, and gas(water vapor). In your drink, when you add artificial flavoring and coloring, does it change the chemical composition of the water? ...
1
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1answer
43 views

If hydrogen bonding in water was weaker, what happens to H+ ion concentration?

Water ionization becomes much less evident if the hydrogen bonds are just a few percent stronger but pure water contains considerably more $\ce{H+}$ ions if they are few percent weaker. I found ...
2
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2answers
49 views

Reuse 20 litre plastic drums for drinking water?

Would you consider it safe to clean and reuse a 20 litre plastic drum that contained 36% Hydrochloric Acid for drinking water? If so how would you recommend cleaning it?
2
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1answer
54 views

what would happen if you got a full package of wet silica gel on your hand after it tore open? [closed]

I accidently opened a bag of silica gel and got it on my hand what will happen to my hand because now it kinda feels weird.
2
votes
1answer
38 views

Does the density of a liquid and gas phase of a substance(nitrogen or water) converge when reaching critical point

I know that the there is no difference in density in a liquid and a gas phase of a substance after the critical point. But I do want to know if this difference in density is more continuous or if it ...
2
votes
1answer
152 views

Boil to dry 50 litres water

I would like to find out how long it would take to completely turn 50 litres of water to steam. Let's assume power of 2500 W and the water is already at boil. I am not very scientific so please ...
2
votes
1answer
44 views

Density of water and temperature

Is there a fromula that shows how the density of water is affected by temperature? For example, with the speed of sound it can be shown how temperature will affect the speed: v = 331 m/s + (0.6 ...
-1
votes
2answers
75 views

Hydrogen peroxide from water

Is it possible that $\ce{2 OH-}$ from water could react to form $\ce{H2O2}$? I mean most autoionization forms $\ce{H3O+}$ and $\ce{OH-}$. However I think it is possible that $\ce{H-}$ and $\ce{OH+}$ ...
2
votes
2answers
40 views

Same monomers, different water content?

We're currently studying "the chemistry of contact lenses", which is mostly polymers and gels. I just looked at the package of two pure hydrogel lenses made out of the same monomers, but they have ...
11
votes
5answers
3k views

Why is water “the universal” solvent?

An old question that our textbook tried to answer but worsened the situation. Many things are soluble in water. So many, that studying solutions will always require studying aqueous ones. It is true ...
3
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0answers
63 views

Why do some solid chemicals dissolve better in colder water?

I just discovered that some solid chemicals, such as $\ce{Na2SO4}$, dissolve better in cold water than hot water from here and would like to know if there is any particular reason as to why. Is it ...
1
vote
0answers
17 views

Is there a substance that would react with seawater to produce a dense, insoluble, nonporous precipitate?

Is there a substance that would react with seawater to produce a dense, insoluble, nonporous precipitate? Alternatively, is there a hygroscopic substance that will absorb water and expand into a ...
3
votes
1answer
755 views

Why isn't water an ionic compound?

If two alkali metal atoms join with an oxygen atom, an ionic bond forms. Since hydrogen has the same number of valence electrons as alkali metals, why can't water be ionic? This is what I'm ...
3
votes
0answers
41 views

Is Sweetwater, Missouri, named due to water contamination with lead compounds?

Sweetwater Missouri is known for it's mineral resources, particularly rich lead sulphide (galena) deposits. I was curious to find the origin of the name 'Sweetwater' and if it had any connection with ...
7
votes
1answer
326 views

What Causes there to be a Maximum Amount of Salt which can be Dissolved in Water?

When you add salt to water and stir, after a while the salt will no longer dissolve. Why is this?
4
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2answers
53 views

Ratios of produced gases in water electrolysis

I just did a little water electrolysis experiment at home by immerging two aluminum electrodes in water with a small amount of table salt. The voltage of the battery was 6 V. What surprised me is ...
6
votes
2answers
50 views

In the wet medium of an ocean, how does a hard shell form?

In general, if you were to try make something hard in a liquid medium (especially water) it is quite difficult to make the material solid. Things such as mollusks though, have no problem generating ...
4
votes
1answer
81 views

Do water hybrid cars really exist?

I have heard a few claims about water-fueled cars. Being a student of Engineering I totally understand that water-fueled cars (using electrolysis to generate Hydrogen) are nothing more than a hoax, ...
2
votes
1answer
25 views

How can a waterproofing material be “water-based”?

I've been trying to determine how a particular waterproofing material, which claims to be "water based", can still be hydrophobic. First of all, the product in question is EPRO ECOLINE-R, which also ...
2
votes
1answer
29 views

What is a water blank?

What is a water blank? I am doing some research and I am suppose to prepare a solution. I should mix 10g of soil with 95ml of water blank in order to create a soil suspension. My problem is I am not ...
3
votes
1answer
39 views

What do different forms of ice look like?

Everyone is familiar with the very common, hexagonal ice. Bit there are many other forms of ice - what do they look like? If you had big blocks of ice in all the different known phases next to a block ...
0
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0answers
7 views

Are the native starch's structure and properties different from retrograded starch?

Starch gelatinization occurs when native starch is being expose to heat and water. Gelatinized starch then can be retrograded under cool temperature. But the structure and properties of retrograded ...
5
votes
2answers
271 views

Nomenclature for different types of ice

How many types of ice exist and what is their nomenclature? I know that the ice on Earth is $I_h$, but why so?
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0answers
24 views

Why does ice water taste tastier than normal water? [duplicate]

Why does cool water taste tastier than normal water? I don't understand if water has no taste, color & odor. Then why does cool water taste different compared to room temperature water?
16
votes
4answers
4k views

Hypothetical: What happens to water as pressure increases to infinity?

I've asked a similar question here but the answer given shows the behaviour of water under general conditions. I'd like to know what the behaviour of water is like as pressures increase towards ...
4
votes
1answer
81 views

Why concentrated sulfuric acid for dehydration and dilute for hydration?

So for dehydration of ethanol, we use concentrated sulfuric acid, like this: but for hydration of ethylene, we use dilute sulfuric acid, like this: so why is one concentrated, and one dilute? ...
0
votes
1answer
35 views

Oxygen dissolve in water

I know that $CO_2$ and $O_2$ are slightly soluble in water ($H_2O$) In my understanding, when carbon dioxide dissolve in water, they will react to form carbonic acid just like the equation below. ...
7
votes
1answer
85 views

Is there a simple way to separate deuterium oxide from tap water?

I understand that tap water contains minute amounts of deuterium oxide (heavy water). Is there a simple way to separate, concentrate the $\ce{D2O}$?
1
vote
1answer
60 views

What would be the reaction:if I put melting iron in normal water?

I know it's a very ordinary question.But I have to know it correctly. What would be the reaction:if I put melting iron in normal water?Will water be chemically changed?
2
votes
1answer
87 views

Does the amount of acid change when I add water to vinegar?

I have a question that asks me to describe why adding distilled water to my vinegar sample would not affect my calculated Molarity (determining amount of acid in the vinegar be titration with a base). ...
1
vote
1answer
27 views

Does a timed reaction “ready indicator” paper exist?

I'm trying to see if such a thing exists in paper form that upon activation, changes colour or "indicates" after a set configurable amount of time. In other words a litmus or ph paper that can act ...
2
votes
1answer
495 views

Does hydrogen bonding only occur between water molecules?

Does hydrogen bonding only occur between water molecules? Is the dipole-dipole intermolecular interaction know as hydrogen bonding because it is between water molecules, or is called that because of ...
3
votes
1answer
701 views

Determining weight-percent methanol in water from specific gravity and temperature

The company I'm working with uses a fuel mixture of methanol and water. We use a hydrometer to measure specific gravity, in order to test the composition of fuel received from our suppliers. To ...
2
votes
2answers
46 views

Electrolysis not running, maybe dependant on distance of electrodes?

So I created a DC power supply of 15 V (special transformator connected to the net) and I have a graphite anode and stainless steel cathode. When I put them in a beaker next to each other in water, ...
2
votes
1answer
34 views

Zeolite process

I'm a higher secondary school studet. See this following image, I can't understand how water can rises through the bed of permutit, my textbook says - Hard water introduced from the top of tank and ...
5
votes
1answer
171 views

Salt concentration and electrical permittivity of water

We know that the electric flux density $D$ can be related to electric field intensity $E$ as $D=\epsilon(\omega) E$ $\epsilon(\omega) = \epsilon_0 \epsilon_r(\omega) $ where $\epsilon_0$ is the ...
1
vote
1answer
54 views

Approach to model solvent in a lattice: e.g. H2O in NaCl

If a lattice contains a solvent, lets say NaCl and water of crystallisation, what is the condition for a solvent molecule to change it's location? From my current point of view I assume that such a ...
3
votes
1answer
64 views

Electrolysis of Beer

Electrolysis of water, means that the water is separated into hydrogen and oxygen. As beer also includes water, I initially thought electrolysis of beer would cause the water to separate, and the ...
0
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1answer
29 views

Determination of chlorine in swimming pool water

How do I get started? What kind of experiment do I need to carry out? What equipment would I need for this experiment? Any other help/advice is appreciated.
2
votes
2answers
58 views

water vapor vs air (in a balloon)

I poured some water in a balloon, inflated, and tied it up. Over a period of couple weeks, all water in the balloon is gone. But the balloon is still at about 2/3 of original inflated size. I ...
4
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3answers
2k views

Would equal masses of gold and copper result in the same volume change if added to water?

Would equal masses of gold and copper result in the same volume change if added to water? Density of gold: $19.3~\mathrm{g/mL}$ Density of copper: $8.96~\mathrm{g/mL}$ I was thinking the ...