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

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Chemical based Water Purifier

I am currently researching as too which is better for purifying a water sample. I have obviously tried the standard Google search for 'Aluminium Sulphate or Ferric Chloride' and have come up with lots ...
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0answers
31 views

What are the spectroscopic signatures that differentiate triple state water from water at 1 atm?

According to the Wikipedia article Triple point of water, the triple point of water occurs at The single combination of pressure and temperature at which liquid water, solid ice, and water vapor ...
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1answer
20 views

Can we prevent metal corrosion by creating a vacuum around it?

I have a device in a box which has parts of metal. So can I prevent corrosion by creating a vacuum around the metallic object?
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10 views

Should residual filtered water be removed from a pitcher before new water is added?

Should the remaining filtered water in a filtered pitcher be removed before adding new water to the filtering water system in the pitcher?
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1answer
33 views

Colorimetric test to measure dissolved oxygen in salt water

Are there any simple colorimetric tests for measuring the dissolved oxygen in salt water, which do not involve titration like in Winkler method ? i.e. Are there any chemical reagents, which when ...
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1answer
58 views

Electrical conductivity of pool water

What is the electrical conductivity of pool water? I tried to find some information, unfortunately with no success. I need to know it to make an underwater electronic project. Thanks
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27 views

Aluminum foil in copper chloride solution

What is a physical change when Aluminium is put into Copper (II) Chloride. I know it is a chemical change but are there any physical changes
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2answers
29 views

Hydrogen Fuel Cell and Battery

For hydrogen fuel cell to produce electricity, hydrogen will need to be supplied to the anode. To split oxygen and hydrogen from water and obtain hydrogen, we need to use electrolysis. To use ...
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0answers
24 views

Why does this reaction take place in terms of electronic structure?

I need to know, in terms of electronic charge - the electrophiles and nucleophiles involved - how the electronegativity of the potassium and hydrogen atoms alongside the hydroxide and H+ ions result ...
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1answer
429 views

Can carbon monoxide contaminate water?

Just wondering if you fitted a cold water tank overflow pipe into a car park at the height of a car exhaust , if the carbon monoxide fumes went back up the oveflow pipe into the tank would this ...
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0answers
23 views

Determining which hydrate of calcium chloride I have?

I have calcium chloride in the form of small (1-2 mm) round white pellets, originally bought at a home-brew shop. The packaging gives no indication what hydrate it is. Since each water molecule adds ...
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0answers
19 views

Will the Sulfur-Iodine cycle and Haber Method work at lower pressures and temperatures?

I have a yearlong research project next year in my senior year of high school in which we have to make some product or prototype to solve some issue. My interest was in the Liquid Fluoride Thorium ...
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0answers
21 views

Why does egg yolk turn white when washed with water?

I recently noticed that whenever I washed the egg yolk stuck on some utensils the water becomes milky white. It has to be the egg yolk that turns white and give off the white color to water right?
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3answers
853 views

How concentrated can an acid be?

How concentrated can an acid be without it being supersaturated? Is there a certain limit to how concentrated an acid or base can be? When I mean concentration, I mean molarity; so how concentrated ...
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1answer
91 views

Chalcogens' hydrides as acids?

I've noticed that chalcogens never form binary acids, and instead end up like water, with very little acidity. Why is this? Or am I wrong and there's a counterexample, if so please give it.
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3answers
946 views

Where do the bubbles in a glass of water come from?

This weekend I accidentally left a glass of water on my kitchen table for a few days while I was out of town. Unsurprisingly, bubbles formed on the walls. As I understand from the last time I ...
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1answer
34 views

Formation of O₂, Water, and Electricity from Hydroxide?

The Clark Type Oxygen Electrode converts water, oxygen, and electrons into hydroxide via a hydrogen peroxide intermediate: \[\ce{O2 + 4e^{−} + 2 H_2O -> 4 OH^{−}}\] Which is the sum of: \[ ...
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1answer
47 views

Amount of Energy Needed for Boiling a Litre of Water [closed]

What is the amount of energy (J or Wh) needed to boil one litre of tap-water in a regular kettle starting at room temperature (20°C)? The calculation itself assuming ideal and standard prerequisites ...
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1answer
62 views

Why do carbon dioxide and sodium hydroxide not form sodium oxide and carbonic acid?

Why do carbon dioxide and sodium hydroxide not form sodium oxide and carbonic acid? $\ce{CO2 + 2NaOH -> Na2O + H2CO3}$ as opposed to: $\ce{CO2 + 2NaOH -> Na2CO3 + H2O}$ This is in the ...
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0answers
49 views

Is there something which will block liquids but is dissolved by blood?

Is there a material which can be applied to a surface that will block liquids but is dissolved by blood? The idea is to use the liquid to close a circuit, but only if blood is present. I'm wondering ...
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1answer
32 views

How does “breathable” siloxane water sealant work?

(This is an interdisciplinary question, between molecular chemistry, materials science & construction. I think Chemistry SE is the right fit, but please move it if needed.) Silane/siloxane ...
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0answers
21 views

Test for chlorine and chloramine in city water supply

I am looking to install a water filter system and I wanted to test the water for free and total chlorine. I understand from the city water report that it uses chloramine and NO chlorine (test ...
4
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1answer
50 views

Chalky residue from melted ice cubes

I bought a new refrigerator that makes ice cubes. The instructions said to discard the first 3 full bins of ice in order to ensure the new water line is flushed clean. I dumped the full bins in my ...
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0answers
25 views

If we mix Ice and water (both at 0 degree Celsius), does their quantity remain constant?

I was wondering that whether Ice and water mixed (both at 0 degree Celsius) undergo a change in their concentration or not. If not, then does it has nothing to do with equilibrium constant? ...
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2answers
2k views

Why is snow white?

I know that this is a rather ambiguous question; but my question is, whenever we take water and freeze it in the freezer, it still tends to stay clear. Since snow is just frozen water, why is it ...
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1answer
31 views

Pre heat coal before burning

So I was wondering if pre-heating coal will improve the efficiency of a steam boiler. I did find that intake air pre-heater and water pre-heater do increase efficiency, but I could not find anything ...
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1answer
40 views

Can someone induce cancer in another person

Is it possible to poison someone's food on a daily basis in order to give them cancer? The thing here is that i'm worried someone at my workplace might be poisoning other people's water (each ...
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1answer
31 views

Boiling aluminum in high-alkalinity water

This question ultimately relates to brewing beer, but more specifically to water treatment before brewing. Though I can't get a water quality report, I suspect I have high levels of bicarbonate ...
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2answers
55 views

What allows all 3 states of H₂O to be present at the same time?

How is it possible for there to be a glacier floating on water but under clouds? Depending on the temperature, shouldn't there only be one state of water?
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1answer
59 views

Can water electrolysis detect the water impurities?

A salesman came to my house to demonstrate his water purifier machine which is a RO Purifier. To show the difference between his purifier machine and the machine I own, he took some water from my ...
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1answer
34 views

Is there any abbreviation for hydrates?

I'm getting tired of writing out the full formulas for hydrates, adding $\ce{.$x$\,H2O}$ to all formulas. I'm wondering if there's standard shorthand for these.
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2answers
52 views

Is water a better nucleophile than bromide?

I am a student of biochemistry. My organic chemistry professor was giving a lecture and he talked about halohydrin formation reactions. At one point, he said that "water attacks instead of bromide ...
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2answers
299 views

Solubility of Noble Gases

I read this statement that " Xenon is the most soluble noble gas in water " . My first doubt is , Why does the solubility of noble gases in water increase down the group ? Even if this is the ...
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7answers
5k views

How can 30 ml of water be heated in less than 10 seconds?

How is it possible to heat a tiny amount (30 ml)[1] of water to a high enough temperature to make a coffee, in less than 10 seconds and possibly instantly? Most heaters that I know of heat water ...
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1answer
38 views

Why don't water molecules react alongside aqueous reactions?

To explain my question I'll use an example: We all know that sodium displaces copper in a solution of its sulfate in the reaction: $$\ce{2Na (s) + CuSO4 (aq) \rightarrow Na2SO4 (aq) + Cu (s)}$$ My ...
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1answer
39 views

Does the boiling boint of miscible liquids follow a linear relationship?

I want to create a steam bath for a reaction the proceeds well at 105℃. I cannot use pure (demineralized, anyway) water for this, since it would boil at 100℃ at STP. As such I figured ...
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1answer
150 views

How to RAISE the melting point of water?

It is common that adding common salt into water will lower its melting point. But, is there any way to RAISE the melting point of water? Does it lower the boiling point of water as well? Why?
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2answers
70 views

What is the smell of a glass of water in contact with fresh air?

When you pour water into a clean glass in a small confined room with no or little fresh air circulation, the only smells you perceive are those of the glass and the water (or the impurities from both ...
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2answers
108 views

Can artificial sea water be prepared by mixing sea salt with water?

I am looking for ways to easily prepare artificial sea water. The chemical composition doesn't have to exactly match that of natural sea water. On-line I can find recipes to prepare sea water. But I ...
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2answers
63 views

What is hard and soft water and how does the process of dissolution work?

This is a very basic question about solubility, especially solution of table salt in water and solution of sugar in water. I have heard about terms like hard water, soft water, filtering of water to ...
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2answers
107 views

Are Na and Cl ions from NaCl in water separate charged particles?

Suppose I pour some sodium chlorine into water. So, what happens is that NaCl(s) → Na+(aq) + Cl-(aq) meaning that the ionic bond between Na and Cl breaks up (correct this far?) Now, does this mean ...
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3answers
314 views

Why is oxygenated water not H2O2?

Oxygenated water has become popular for a variety of uses recently - for health purposes internally as well as enhanced wound healing. Anyhow, my dad asked me recently if I knew how it is that ...
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2answers
60 views

Why is water considered ionic in fuel cells but otherwise covalent?

If water, $\ce{H2O}$ is a covalent compound formed by sharing of electrons, why is it said (in case of fuel cells) that formation of water from hydrogen and oxygen is a redox reaction (transfer of ...
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1answer
53 views

Hydrolysis - How do I know which atoms react?

In the hydrolysis of Propanamide ($\ce{CH3CH2CONH2}$) how do I know which molecules react with the water? $$\ce{CH3CH2CONH2 + H2O \rightarrow ?}$$ I don't know how to split the molecule. In the ...
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41 views

Aluminium in Active Carbon Water Filters

So I saw on article stating concerns about eating active carbon due to high levels of aluminium found, would this have implications with active carbon water filters? Or would the aluminium not get ...
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1answer
35 views

How to purify water with activated carbon?

If I am not mistaken, distilling water does not remove all possible impurities. Chemicals with boiling points less than $100 ° C$ will be transferred as well. Does the usual tap water contain such (I ...
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3answers
104 views

Can plastic leak into water from a HDPE “2” plastic container at room temperature?

Here in USA supermarkets often sell water in plastic 1 gallon jugs. These jugs seem to all be stamped with the text "HDPE" (meaning that the material is High-density polyethylene) and a resin number ...
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2answers
46 views

Structures present in liquid water

I know this may be a too generic question, but here it goes anyway. It is already know that solid water (ice) organizes its molecules in a lattice (in a variety of 16 different crystals and one ...
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1answer
46 views

The sponge isn't foaming up, why?

When I add dish soap to a sponge it is able to foam up. But if I leave the sponge alone for an hour, it doesn't foam up, not even if it is wetted. Why? The sponge should still contain dish soap an ...
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1answer
157 views

What is the white substance left behind after boiling down water

I was boiling down water in a stainless steel pot as an experiment the other day. When the water was completely vaporised, a white substance was left behind on the bottom of the pot. I tried rubbing ...