Skip to main content

Questions tagged [water]

For questions relating to water (H₂O), specifically its structure, properties, and uses in chemistry. For questions not about water but rather about solutions in water, use tags [aqueous-solution] or [solubility] instead.

Filter by
Sorted by
Tagged with
-3 votes
0 answers
18 views

Titanium tank additions [closed]

I have a 8000 gallon tank of HF , nitric acid and water. How do i calculate how much nitir acid to add to a tank at 9g/l to take it to 12 g/l
lenard murphy's user avatar
-1 votes
0 answers
58 views

Whenever I open a window, it causes certain things indoors to immediately smell. What process is causing this to happen? [closed]

I have lived in a number of different homes and apartments. An undeniable constant is that as soon as I open a window, certain types of things all suddenly have the same smell to them. I have a very ...
JJ123's user avatar
  • 81
0 votes
3 answers
110 views

Why is that during a phase transition, a single melting point exists for melting?

I know that during melting, latent heat is used in increasing potential energy (as intermolecular distance increases) of the complete structure of given solid to liquid. But it can also happen ...
rimor's user avatar
  • 1
-2 votes
1 answer
51 views

Heating a Single Water Molecule [closed]

From my understanding, phase changes break/form bonds between molecules of the same substance. Assuming this is in a vessel at 1atm of inert gas, if I have one molecule of water with no bonds to other ...
Camel Camel's user avatar
-2 votes
0 answers
42 views

Why cant H2O be linear? [duplicate]

My understanding is that a H2O molecule cannot be linear due to repulsions between the electrons of the non-bonding domains and the hydrogen: However i was wondering why the structure could not take ...
Varshil MVH Pets's user avatar
0 votes
1 answer
35 views

What materials can be used to store supercritical water

I am wondering which materials might be suitable to contain SCW (supercritical water). Here, we are assuming that the pressure is almost equal on the outside of the container than the inside. I have ...
Prime Price's user avatar
0 votes
1 answer
55 views

Neglected partial pressures dependence of water splitting

I am studying electrochemical water splitting and I have a huge doubt. The standard redox potential for the total reaction is 1.23 V, but this is in standard conditions, where the hydrogen and oxygen ...
th3f4tk1ng's user avatar
2 votes
0 answers
42 views

Alternative pH sensing methods?

I am looking for alternative methods to measure the pH of water (swimming pools, tap water, rivers,...) with (ideally) the following properties: Durable: no maintenance or calibration required for 5-...
emdura's user avatar
  • 21
2 votes
2 answers
306 views

My textbook writes hydronium ion as [H(H2O)]+, is this correct? [closed]

[...] Thus, it bonds to the oxygen atom of a solvent water molecule to give trigonal pyramidal hydronium ion, $\ce{H3O^+}$ $\ce{\{[H (H2O)]^+\}}$ (see box). In this chapter we shall use $\ce{H^+(aq)}$ ...
Hdje's user avatar
  • 127
-2 votes
1 answer
114 views

Why is the ionic product of water also the equilibrium constant of dissociation of water?

This answer presents a derivation of the value of ionic product of water at $25^{\circ}\text{C}$. The relation $K_\text{eq} = \operatorname{e}^{-\frac{\Delta_\text{r}G^{\circ}}{RT}}$ is used for the ...
Thecoder001's user avatar
2 votes
1 answer
100 views

Is a hydrogen atom 'locked' to a given oxygen atom in ice?

Ice, Hydrogen bond, and Ice rules Wikipedia articles seem to imply that the covalently bonded hydrogen atoms are fixed to their given oxygen atom and do not change positions as long as the ice remains ...
ericnutsch's user avatar
3 votes
0 answers
103 views

Chemical Mechanism Behind Water-Soluble Ink

I came across water-soluble ink pens designed for creating temporary fabric marks, particularly in cross-stitch stamping. These ink dissolve in water, transforming water into a colorful liquid, while ...
Fast Snail's user avatar
1 vote
0 answers
41 views

Freezing of a beverage

I am trying to generally describe the process of freezing beer and how the different ingredients influence the freezing process. My general approach right now is to observe a beer as 90% water and 10% ...
Maxim's user avatar
  • 11
0 votes
0 answers
81 views

Water of Crystallisation in Borax and Copper Sulphate

The formula for borax is written as $\ce{Na2B4O7.10H2O}$ and also as $\ce{Na2[B4O5(OH)4].8H2O}$. From the structure, it obvious from where the 2nd formula comes. But the question I have is, what is ...
Sudarshan Kulkarni's user avatar
3 votes
1 answer
170 views

Reading and adjusting pH of reverse osmosis water

I grow things for a living and regularly use pH meters + strips to read and adjust the pH of various nutrient and pesticide solutions. Oftentimes, I have a need for nearly naked water with the pH ...
Michael John's user avatar
3 votes
2 answers
247 views

Is there a supercritical state for ice?

I know there is such a thing as a supercritical fluid, where the vapor and liquid phases are indistinguishable, but is there such a thing as a supercritical state for ice? Another way of asking this ...
suse's user avatar
  • 803
7 votes
1 answer
433 views

Dewpoint of water in relation to composition of atmosphere

A couple of colleagues and I were talking about the nature of dewpoints, specifically the dewpoint of water in relation to the chemical composition of the atmosphere in a closed space. If I remember ...
Oak Staff's user avatar
  • 191
2 votes
4 answers
163 views

How can the Kw of water be constant?

I know in neutral solution, $\ce{[H+]}= \ce{[OH-]}= \pu{1.0 x 10^-7}$. However, let’s say I add an acid like HCl. This will increase $\ce{[H+]}$, therefore it’s no longer $\pu{1.0 x 10^-7}$, but is ...
Maria's user avatar
  • 41
-2 votes
1 answer
48 views

Where does the ionisation energy for a reaction to take place comes from? [closed]

Can anyone tell me exactly what happens during a chemical reaction in terms of ionisation energy? I know that during a reaction there is an exchange of electrons (except for those where electrons are ...
Zane Stockton's user avatar
2 votes
0 answers
50 views

Validity of ideal gas law for pure species or mixture

I'm currently dealing with an application involving gases. I have pure nitrogen as a pressurizer and eventually water vapour (only if condition for evaporation or boiling are met). I wanted to ask to ...
Enrico's user avatar
  • 23
1 vote
0 answers
141 views

How does a dry shampoo work?

From my chemistry knowledge, I know that soaps are made from fatty acids and some sort of base and this reaction also gives us $\ce{H_2O}$ so the grease in hair dissolves and gets washed away in water....
Rose's user avatar
  • 21
14 votes
5 answers
3k views

Why is octane more volatile than water while having a higher boiling point?

Octane has a boiling point of 120 °C. Water has a boiling point of 100 °C. The definition of boiling point is, "the temperature which the liquid substance's saturated vapor pressure equals the ...
donthababakka's user avatar
0 votes
1 answer
88 views

Closed pressurized water vessel

Suppose we have a closed container not isolated from the external environment so that heat exchanges can occur on the lateral wall (mainly for convection). The water inside is pressurized by a gas (...
Enrico's user avatar
  • 23
4 votes
2 answers
679 views

Can “hydrates” of crystals form with other molecules?

It is well known that copper sulfate, sodium sulfate, et al crystallize with 5,10 water molecules of hydration, locked in their crystal lattices. Is it possible to have other molecules instead of ...
Alex Wang's user avatar
1 vote
2 answers
129 views

Understanding the Role of Gibbs Free energy and Enthalpy as the energy required to drive a reaction

I was looking at the enthalpy change for water-splitting reaction: $$ \Delta H^o_R = [\Delta H^0_{H_2(g)} +\frac{1}{2}\Delta H^0_{O_2(g)}]-\Delta H^0_{H_2O(l)} = \pu{285.83 kJ/mol}$$ According to ...
RMS's user avatar
  • 193
0 votes
0 answers
28 views

How does MeOH absorb into polypropylene?

Currently working on a project where we want to functionalize PP membranes with various monomers. Our chemistries are aqueous and have therefore not been compatible with the membranes. The work-...
Mr. H's user avatar
  • 1
2 votes
1 answer
298 views

How to correct for acidic water when taking the pH of a soil/water solution?

I work in a soil science lab and not very much a chemist. Recently I took the $\mathrm{pH}$ of a large number of soil samples using a glass electrode on a mixture of $\pu{10 g}$ soil and $\pu{20 mL}$ ...
Tillandsia123's user avatar
-1 votes
1 answer
104 views

Is a Sodium Chlorite Product Safe for Car Odor-Removal? [closed]

I would like to ask the science community's opinion about the safety of sodium chlorite for use as an odor-eliminator in an automobile's interior. While the ingredient in the product is sodium ...
Jeff's user avatar
  • 1
-2 votes
1 answer
90 views

Why my mineral water from different sources do not mixed well? [closed]

Background: In 8 hours range, I have bought cold mineral water (brand A), then refill the plastic bottle with cold mineral water (brand B) from my office. As far i know, brand B has high pH while ...
Yukha Dharmeswara's user avatar
-2 votes
1 answer
145 views

Calculating salinity from sodium and chloride in water [closed]

let me start by saying that I am definitely no chemist, so this question might (or might not) seem trivial to all you professionals out there. I have recently found a brand of carbonated water here in ...
Henrik Hillestad Løvold's user avatar
-6 votes
1 answer
54 views

How can i preserve a coating of baked in powder on activated carbon pellets whenever it rains? [closed]

I'm trying to create pellets of activated carbon that have a coating of a soluble white powder. To make this I first dissolve a significant amount of this powder in boiling water to the point where ...
Maurice's user avatar
  • 119
1 vote
1 answer
149 views

How do the ions in electrolytes lead to lower dielectric constants compared to pure water?

I am interested in the salts used in the gel electrophoresis buffers. As I understand it, one of their roles is to change the conductivity of the medium, because otherwise the electric field would be ...
iRove's user avatar
  • 119
3 votes
1 answer
348 views

What is the effect of dissolving ammonia in water on hydrogen bonding?

Hydrogen bonding exists between $\ce{NH3}$ molecules. When $\ce{NH3}$ is dissolved in water, I know that hydrogen bonds are formed between $\ce{NH3}$ and $\ce{H2O}$ molecules. However, do the $\ce{NH3}...
photon's user avatar
  • 59
0 votes
1 answer
134 views

At what temperature is bismuth the densest?

Both water and bismuth have denser liquids compared to solid forms, and we know water is the densest at the temperature of about 4°C. Does the same thing apply to bismuth? Of course, I know the ...
user avatar
1 vote
0 answers
127 views

What equation can be used to determine the mass of water evaporation over time, when cooking?

When baking, cooking or writing recipes, it would be useful to have a ballpark estimate of evaporation rates. This question asks about water, although the answer would ideally include an ...
JKVeganAbroad's user avatar
1 vote
0 answers
153 views

What is the osmosis equilibrium point of water beads (for plants)?

In theory, water beads for plants take in water when immersed in it to gradually release it to the roots of the plants. This process happens through osmosis. When the relative humidity is high enough, ...
Trylks's user avatar
  • 127
3 votes
0 answers
64 views

What could be the origin of a persisting distorted water NMR signal?

I am currently running some solvent suppression experiment on water samples. I first run a one scan 1H experiment to get the ''O1P'' and then implement it in the solvent suppression experiment (''...
Salem's user avatar
  • 31
-2 votes
1 answer
177 views

How does an equilibrium move when increasing the concentration of water?

I have the following equilibrium given: $$\ce{[Co(H2O)6]^2+(aq) + 4 Cl-(aq) <=> [CoCl4]^2-(aq) + 6 H2O(l)}$$ (I imagine the (l) for water is wrong, as the water is a part of the solution) The $\...
Rekeren1's user avatar
-1 votes
1 answer
105 views

Diagram of the electric field potential around water

Is there diagram of the electric field around a water molecule. I have seen some simplifications that treat hydrogen as a positive point source and oxygen as a negative point source. But I am looking ...
Q the Platypus's user avatar
0 votes
1 answer
156 views

Is the common way to calculate the pH of a solution with low concentration of acid wrong? [duplicate]

We had a chemistry test and one of the questions was this: What is the pH of $1,4^{-8} M$ $HCl$ in water? This is such a small amount of acid that you need to take into concideration the self ...
Tuskies's user avatar
  • 35
6 votes
1 answer
442 views

Does "brine rejection" happen for dissolved gases as well?

"Brine rejection" is the effect of sea ice pushing out dissolved salts, forming sweetwater ice and brine. I understand "freeze distillation", a method to concentrate alcohol in ...
HannesH's user avatar
  • 483
3 votes
1 answer
237 views

Why does H2O appear as spikes in IR of air?

In the IR of air shown below, the region for water at 1500 cm-1 is hard to individually assign peaks due to their "spikey" nature. Is there any specific reason for this or does it just ...
Audrix's user avatar
  • 137
0 votes
1 answer
42 views

What happens to the air pressure above water as its heated to and past boiling?

If I put a pressure sensor inside an airtight container half-filled with water, and heat the water, what will the pressure sensor read as the temperature increases? Would it linearly increase (black ...
Oliver Walters's user avatar
3 votes
0 answers
44 views

What is the goopy substance that forms before CaCO3 precipitates?

I do a lab where we mix a solution of sodium carbonate with a solution of calcium nitrate. As expected, calcium carbonate (white solid) precipitates out. However, if the concentration is high enough, ...
JLB's user avatar
  • 49
3 votes
1 answer
252 views

Water vapor in CO2 - a chemical reaction?

I am doing some work on measuring water content of a stream of CO2 at ambient temperatures (25°C). My question is this: Am I dealing with purely a mixture of gases, or is there some chemical reactions ...
Dirk Bruere's user avatar
  • 1,590
-5 votes
1 answer
1k views

How does hydrogen and oxygen combine to make water? [closed]

When two hydrogen atoms fuse with one oxygen atom to create a molecule of water, each hydrogen atom donates its single electron to the oxygen atom, resulting in 10 electrons for the oxygen, instead of ...
Terry Nixon's user avatar
1 vote
2 answers
162 views

"Cleaning" of HNO3 solution using distillation

In many industries, pickling baths are common. These are 10 cubic meter baths containing acid baths that metal components are dipped into prior to surface treatment. When the metals are dipped, some ...
Evaporation123's user avatar
2 votes
0 answers
35 views

Water dissociation constant $K_w$ in vapour, or are there charges entities ($\ce{H3O+}$, $\ce{HO-}$,...) in water vapour?

When water is in vapour state, to which degree is there still some dissociation with the existence of charged species like $\ce{H3O+}$ and $\ce{HO-}$? (I would be interested by any reference to ...
The Quark's user avatar
  • 597
-1 votes
2 answers
53 views

Relationship between grams of root and content in a tea

When we make a tea from a some herb, what exactly is the relation between the weight of the herb/root stepped in hot water and how many grams/milligrams are in the tea. For context and giving a ...
Jim's user avatar
  • 107
-1 votes
1 answer
106 views

How can I measure the energy contained within water vapor?

Let’s say I have a kilogram of water vapor at $\pu{423 K}$. Can I directly measure the energy, contained as heat, within the vapor? All the laws I know depend on knowing the changes that happened that ...
Belal Bahaa's user avatar

1
2 3 4 5
22