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

learn more… | top users | synonyms

1
vote
0answers
9 views

Trend in results for reproducibility of iron and phosphate

Periodically in our lab, we have a reproducibility test for the various samples that we analyze. One such sample is boiler water. Two of the parameters that we test are phosphate in boiler water and ...
10
votes
3answers
981 views

Why is condensation in dyed beverages colorless?

Does food coloring somehow evaporate and turn into nothing? Or does the beverage itself being much more color intensive? I had a bottle of Gatorade, colored Lemon-Lime (and flavored as such). I ...
10
votes
3answers
528 views

How is dissolving a physical change and not a chemical change?

When salt dissolves in water it dissociates and it is no longer in a lattice structure. The electrostatic forces are no longer there and are replaced by water-ion interactions. To me that sounds like ...
3
votes
1answer
36 views

Plastic membrane that lets water in from the outside only?

I'm looking for a type of plastic membrane that would let water through it from the outside, but wouldn't allow water to escape once it's inside the membrane. Ideally available in a roll. Does such ...
-1
votes
1answer
26 views

Energy required to electrolyze water [closed]

What voltage DC current would I need to electrolyze 1 liter of water in 1 hour using 1 gram $\ce{NaOH}$ for a electrolyte
5
votes
1answer
121 views

Aluminium and water safety

I have a 8000 gallon water tank that has always had pristine clear water. I have a brass float valve at the top input to the tank. Someone put an aluminum ladder in the tank (15 ft deep tank) and ...
4
votes
1answer
41 views

Is there a type of detergent/surfactant that evaporates at STP?

Are there any type of detergent/surfactant chemicals that would be good for removing dirt and grease from fabric that also would evaporate from the clothes within, say, 24 hours leaving no residue?
3
votes
0answers
27 views

Is there a food-safe hydrophobic liquid with a substanially higher denisty than water?

Requirements In short, I am looking for a fluid that meets these criteria: Hydrophobic Denser than water Low viscosity Food safe Background We are working on adding a pool and designing a ...
2
votes
0answers
48 views

What is that process called in which we add water molecules to an ion to form a complex?

An example would be $\ce{[Fe(H2O)6]^2+}$ in which it has 6 water molecules associated with it. What is the process of adding these water molecules called?
7
votes
2answers
115 views

Why there is no change in water level when salt is added?

Let us say we have one glass of water and after that when we add one or two spoon of salt then we notice that salt dissolves in it but when we measure the water level we found that there is no ...
2
votes
1answer
61 views

Quality of water for drinking purposes

As I’m reading about water cations and anions, I read that the benefits we gain from water are of course lots, but the most important of them is the neutralisation of acids ($\ce{H+}$) from the anions ...
1
vote
0answers
39 views

Why are H2O asymmetric while CO2 is not? [duplicate]

What is the reason for water molecules $\ce{H_2O}$ being asymmetric while other molecules like $\ce{CO_2}$ being completely symmetric? See the pictures below: In both case there is an ...
2
votes
1answer
38 views

how to define proper ppm concentrations for water solvent vs alcohol solvents?

1 ppm is 1 mg / kg Water density: 999.97 kg/m³ methanol density: 791.80 kg/m³ solution 1 with water as solvent: at 1 $\ce{\mu}$g / mL is considered 1 ppm solution 2 with methanol as solvent: at 1 ...
2
votes
1answer
46 views

Solubility and Evaporation - Would the concentration still be 1 ppm?

A certain salt has a solubility of 1 mg/1 L. I have 1 mg of this certain salt dissolving in 1 L of water, I have a concentration of 1 ppm. 1st Question: If the solution is left open to evaporation, ...
3
votes
0answers
18 views

how to clean pesticide solutions in volumetric glass and graduated cylinder properly?

I have pesticide (Dimethoate) dissolved in methanol in volumetric flasks and graduated cylinders. How do I clean these glassware properly before moving on to the next dilution of a different pesticide ...
-1
votes
1answer
49 views

Final concentration … How to calculate it? [closed]

My question is here but i just want to find out how to go about it? If 50.0 mg of $\ce{CO3^2-}$ and 50.0 mg of $\ce{Ca^{2+}}$ are present in 1 liter of water, what will be the final ...
2
votes
2answers
42 views

What is the difference between these equations for the Contact process?

Some webpages describe the contact process as this (I left out $\ce{SO2}$, $\ce{SO3}$ production): $\ce{SO3 + H2SO4 -> H2S2O7}$ After this, it is controllable to add water to the oleum therefore ...
0
votes
1answer
25 views

Cleaning an overhead water tank using Alum or other chemicals?

Alum is generally used in water tanks to settle down solid impurities. Since it contains aluminium I suspect it to be toxic to humans. So are there any safe chemicals to clean large overhead tanks ...
0
votes
0answers
21 views

How the heat a large amount of water that is safe to use?

I would like to know how heat up a large amount of water ( assumption : 100 liter ) that people could use to take their bath and also it would not be dangerous even if they accidentally ingested it ? ...
2
votes
0answers
33 views

The Health Effects of Alkaline Ionized Water?

I came across alkaline ionized water as my aunts bought a system called Kangen Water from Enagic Inc. The water produced by this system is claimed to contain smaller water clusters (4-6 molecules) ...
1
vote
0answers
26 views

Sugar dissolution test

Is there a way to detect whether sugar is completely dissolved in a cup of water other than looking at the bottom of the cup? I was wondering if there is a test or something that can be carried out ...
4
votes
1answer
64 views

Difference between Superheated steam and Superheated water?

I'm working on a project (school level) and in it I'll be dealing with the pressure generated by water when superheated. I could understand the concept of superheated water but superheated steam is ...
5
votes
1answer
332 views

What happens if I make a hole in a container with superheated water?

Superheated water is achieved by heating water above 100 degree Celsius under high pressure. Now, suppose the temperature at which the water is getting heated is around 250 Celsius and sufficient ...
4
votes
1answer
56 views

Water reacts or doesn't react?

I know that when you have $\ce{HCl}$, $\ce{H2O}$, and $\ce{NaOH}$ that you produce $\ce{H2O}$ and $\ce{NaCl}$. However some people say water does react and so would think that this 2 step reaction is ...
1
vote
1answer
55 views

De-ionized water [duplicate]

Is de-ionized water more corrosive to metals than tap water? I have read that it "wants" the removed ions back and will aggressively take them from any available source.
4
votes
1answer
36 views

Why are the three most simple alcohols completely miscible?

I want to know why the three most simple alcohols (methanol, ethanol and propanol) are completely miscible in water? I want to know what happens at molecular level. I think hydrogen bonding plays ...
14
votes
1answer
812 views

Are there any known chemical properties of tritium water that make it unusually different from protium water?

I suppose the first question supporting the main question is, has tritium water ever been synthesized in sufficient quantity to test chemical properties? If so, and apart from the obvious radioactive ...
5
votes
1answer
128 views

Vaporized sodium hydroxide?

Some time ago, I was making a $\ce{NaOH}$ solution. The solution I had made was much too concentrated, and the heat released in the dissolution of the ions caused the water to begin steaming. ...
26
votes
3answers
2k views

Why is fresh ice sticky?

Fresh ice cubes are almost instantly sticky and easily cling on to fabric and other similarly rough surfaces. A few minutes later, however, the effect almost completely disappears. What is the ...
5
votes
1answer
38 views

Why sodium sulphate has water absorbing capability?

At first I thought maybe sodium sulphate in contact with water produces sulphuric acid which absorbs water but I do not think it is actually a valid reason.
4
votes
1answer
48 views

Is there an electrolyte that will halt the production of Hydrogen in water electrolysis?

Care must be taken in choosing an electrolyte, since an anion from the electrolyte is in competition with the hydroxide ions to give up an electron. An electrolyte anion with less standard ...
2
votes
0answers
28 views

Reference request for the number of solvents around a solute

I want to know if there is a way to find number of solvent molecules that are directly embracing a solute molecule ( something like a reference or table that shows waters of hydration ). Particularly ...
6
votes
4answers
201 views

How can I calculate the charge distribution of a water molecule?

I would like to obtain the 3D charge density of a water molecule for plotting purposes (i.e. not necessarily super-accurate). I know this is a tough problem, but I'd like to give it a try. Since I'm ...
8
votes
3answers
1k views

Does salt vaporise?

Does salt vaporise? If I boil a salty water and leave it there until half of the water vaporises, will it be twice as salty as in the beginning? Or exactly the same? Or somewhere in between?
1
vote
1answer
21 views

Water softener and RO filter

I have a water softener for showers and dishwasher and a reverse osmosis filter for drinking water. For convenience of the install, the RO filter is using softened water (some calcium carbonate has ...
3
votes
0answers
53 views

theoretical model for the Hydrogen bond

I am curious how from the perspective of quantum chemistry the Hydrogen bond is modeled. In particular I am interested in using such a model to estimate the amount of energy released per $\ce{H2O}$ ...
3
votes
2answers
241 views

Can water be liquefied or solidified just by adjusting the temperature, regardless of the pressure?

technically the line between liquid and solid phase would go a long way before hitting the y-axis, but the point is it will eventually. So the question remains, can any liquids, including water ...
6
votes
2answers
117 views

Why is a tin can that appears like galvanised steel rusting?

I bought a canned pineapple and finished the content. The part of the can that is in contact with the liquid appears like galvanized steel (crystalline surface or spangles sort of appearance), while ...
0
votes
1answer
35 views

Which of these compounds does not liberate heat when water is added to it?

Which of these compounds does not liberate heat when water is added to it: $\ce{KNO_3}$, $\ce{NaOH}$, $\ce{CaO}$, $\ce{H_2SO_4}$, $\ce{Na}$. I know from experience that dropping sodium tablets into ...
3
votes
1answer
35 views

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 ...
5
votes
1answer
58 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 ...
2
votes
1answer
54 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?
0
votes
0answers
13 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?
2
votes
1answer
55 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 ...
-1
votes
1answer
111 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
2
votes
2answers
41 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 ...
1
vote
0answers
26 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 ...
5
votes
1answer
451 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 ...
2
votes
0answers
39 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 ...
7
votes
0answers
32 views

Will the sulfur-iodine cycle and Haber Method work at lower pressures and temperatures?

I have a year-long 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 ...