All Questions
Tagged with equilibrium water
44
questions
25
votes
2
answers
13k
views
Why does water dissociate to H3O+ and OH- rather than H+ and OH-?
Why does water dissociate to
$\ce{H3O+ + OH-}$
instead of $\ce{H+ + OH-}$?
This question came to surface when I was learning about acids and bases, and learned this definition:
$\mathrm{pH=}-\log_{10}[...
- 383
12
votes
1
answer
7k
views
What does “to the left” mean?
However, the concentration of hydronium and hydroxide ions will be very, very small; in fact, the equilibrium that's established in solution lies so far to the left, that only 18 in 1010 molecules of ...
- 423
10
votes
2
answers
26k
views
Why is water not part of the equilibrium constant?
In the acid base reaction
$$\ce{NH4+ + H2O <-> NH3 + H3O+}$$
the acidity constant, which is a relation between concentrations is given by
$$K_{\mathrm{a}}=\frac {\ce{[NH3]} \cdot \ce{[H3O+]}}{...
- 413
10
votes
2
answers
885
views
What kind of 'product' is the 'product' in 'ionic product of water'?
My language has different words for product (=the result of a process) and product (=the sum of multiplied quantities), so I need to know the right meaning to choose the right word.
Which of the ...
- 211
8
votes
2
answers
2k
views
Why does increasing the pressure cause ice to melt more?
This question was given under chemical equilibrium.
Why does increasing the pressure on this system cause ice to melt more?
$$\ce{H2O(s) <=> H2O(l)}$$
I'm pretty sure this has to be ...
- 5,532
8
votes
1
answer
187
views
What would be different about a heavy-water ocean world?
The water on Earth is primarily made of $\ce{H2O}$. I'm wondering about the conditions in a hypothetical $\ce{D2O}$ ocean world.
Would it be stable over geologic timescales (~$\pu{0.1–2 Ga}$)? What ...
- 317
6
votes
1
answer
459
views
Can potassium carbonate be used to calibrate hygrometers?
Context:
In the process of trying to calibrate a number of hygrometers, with Sensirion MEMS electronic sensors, I came across the method of using wet salt: an airtight container will stabilize at a ...
- 163
6
votes
2
answers
208
views
Protons and osmotic potential
In a hypothetical enclosed membrane only permeable to water (including hydronium), where inside the pH is lower than the outside, would water move inside?
- 61
5
votes
2
answers
370
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 ...
- 59
5
votes
0
answers
479
views
Why does pKw first decrease but eventually increase when temperature rises?
I understand the initial decrease in pKw.
$\ce{Heat + H2O (l) <=> H+ (aq) + OH- (aq)}$
Temperature increases, reaction shifts to the right, so
$\ce{H+} \text{ and } \ce{OH}$ ...
- 2,853
4
votes
1
answer
391
views
Is HCl(l) acidic?
If in a reaction mixture HCl is given in liquid phase, will it behave as an acid ?
I know that an aqueous solution of HCl is acidic but am confused about the liquid phase.
- 1,916
4
votes
1
answer
789
views
Relationship between the water ionization constant and ionic strength
I read in a textbook that
the water ionization constant ($K_\mathrm{w}$) increases as the ionic strength of the solution increases
and it confused me. If the ionic strength increased, then the ...
- 137
4
votes
1
answer
31k
views
Determining standard Gibbs free energy for water?
I am dealing with the dissociation of water into its components hydrogen and oxygen and I am trying to determine the standard Gibbs free energies of each component. My professor said if the substance ...
- 219
3
votes
1
answer
4k
views
Ethanol and water hygroscopic equilibrium concentration
I am working with a company to help improve their reaction process where they use SDA 2B Alcohol (Karl Fischer titration has it at 99.66% EtOH, 0.3375% toluene). Specifically, I am attempting to ...
- 33
2
votes
2
answers
2k
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 ...
- 3,050