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

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1answer
17 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 ...
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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 ...
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1answer
47 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 ...
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0answers
15 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 ...
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1answer
719 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 ...
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0answers
37 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 ...
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1answer
302 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?
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1answer
35 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 ...
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2answers
45 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 ...
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1answer
57 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, ...
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1answer
22 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 ...
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1answer
25 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
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1answer
36 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 ...
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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 ...
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2answers
261 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
22 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?
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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
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1answer
51 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
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1answer
32 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
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1answer
78 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 $\ce{D2O}$?
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1answer
57 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
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1answer
66 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). ...
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1answer
25 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
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1answer
389 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
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1answer
451 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 ...
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2answers
44 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
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1answer
32 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 ...
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1answer
109 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 ...
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1answer
35 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
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1answer
53 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 ...
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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.
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2answers
52 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 ...
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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 ...
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2answers
59 views

What happens when ice melts?

What happens when ice melts? I have this question, with two possible answers: regularly arranged molecules change into irregularly arranged molecules water molecules become less densely packed ...
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1answer
40 views

Fluoride Color Reaction

I am trying to find visual ways to demonstrate water contaminants. For example, chlorine reacts to N,N-diethyl-p-phenyldiamine (DPD), forming a magenta color. The chemical doesn't need to be accurate, ...
2
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1answer
80 views

Effect of water viscosity (increased due to NaCl concentration) on dissolution rate of CO2

We did an experiment involving different $\ce{NaCl}$ concentration(ranging, 1-4%) on 100 mL of water. Our aim of the experiment was to find the dissolution rate of $\ce{CO2}$in the brine solvent. We ...
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1answer
637 views

How much oxygen is in a cup of water?

I know that water is 2 parts hydrogen and 1 part oxygen. Hydrogen and oxygen are quite light gasses, they don't weigh very much compared to water. Water is very heavy and it made me wonder exactly how ...
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0answers
32 views

Does CO2 dissolution in different salt concentrations affects the amount of carbonic acid formed?

We have a school experiment, where I must report on the following question: Does salinity affect the solubility of $\ce{CO2}$ in saltwater? So we selected four different concentrations of salt ...
3
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0answers
20 views

What additives could make a masonry unit water-repellent but vapor-permeable?

I'm curious about some of the wondrous materials available today are able to repel liquid water but permit water vapor to pass through. I've heard that housewrap-type plastics accomplish this by being ...
3
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2answers
55 views

Using Hydrates as a skin moisturizer

I 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 water could aid in moisturizing the skin. Is this a valid ...
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0answers
17 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 ...
4
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1answer
498 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
594 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
69 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?
3
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1answer
48 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
25 views
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26 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
47 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
55 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 ...
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2answers
474 views

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

I've bought $\ce{NaOH}$ or $\ce{KOH}$ (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 ...