All Questions
Tagged with equilibrium physical-chemistry
434
questions
3
votes
1
answer
394
views
Would concentration of a compound in equilibrium increase even if it's not favored by a volume decrease?
So say I have a reaction where there are x moles of gas on the reactant side, and y moles of gas on the product side, where x>y. The volume decreases, favoring the products side. The textbook I am ...
- 133
9
votes
1
answer
17k
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How do equilibrium shifts affect solids?
Say we have the following reversible reaction: $$\ce{NaOH{(s) }<=> Na^+{(aq) }$+ $OH^{-}{(aq)}} +10.6 \mathrm{kcal}$$
If we add $\ce{OH^-}$ and equilibrium shifts to the left, does that affect ...
- 689
4
votes
2
answers
3k
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Why does changing the temperature shift the equilibrium?
I know that raising the temperature in a reversible chemical reaction causes the equilibrium to shift to the endothermic side.
I know that $\Delta G = \Delta H − T\Delta S$, but I don't know how to ...
- 472
1
vote
0
answers
39
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Chemical Equilibrium - Why does changing the temperature shift the equilibrium? [duplicate]
I know that raising the temperature in a reversible chemical reaction causes the equilibrium to shift to the endothermic side.
I know that $\Delta G = \Delta H - T \Delta S$ but I don't know how to ...
- 472
6
votes
2
answers
46k
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What does it mean for a reaction to favor the reactants/products?
(This example is purely hypothetical.)
You have the reaction $$\ce{H2(g) + O2(g) <=> H2O2(g)}$$
at $T = 500\ \mathrm{K}$. The reaction reaches equilibrium at the following concentrations:
$$\...
- 557
13
votes
3
answers
9k
views
How can the equilibrium shift, while Kc remains constant?
Consider the following reversible reaction.
$$\ce{Cr2O7^2-(aq) + H2O(l) <=> 2 CrO4^2-(aq) + 2 H+(aq)}$$
What will happen to the position of equilibrium and the value of $K_c$ when more $\ce{H+}$ ...
- 557
5
votes
1
answer
24k
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Calculating volumes of acid/base required to make buffer using pH and pKa
How would we use our $\mathrm{p}K_{\mathrm{a}}$ of the acid component of the buffer to calculate $\large \frac{[\ce{A-}]}{[\ce{HA}]}$?
I know $$\mathrm{pH} = \mathrm{p}K_{\mathrm{a}} + \log\left(\...
- 345
5
votes
1
answer
376
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Equilibrium constant expression for heterogeneous equilibrium
Consider this reaction:
$$\ce{CaCO3(s) <=> CaO(s) + CO2(g)}$$
for this, $K_c=\left[\ce{CO2(g)}\right]$
For a given temperature, $K_c$ will remain fixed. That means, the amount of $\ce{CO2}$ ...
- 863
3
votes
2
answers
706
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Equilibrium constant
I know that equilibrium constant depends on temperature and pressure. But according to Le Chatelier's principle when we change pressure of reagents the equilibrium is the same. Why?
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2
votes
2
answers
631
views
How many of different types of chemical species are in a certain volume of aqueous solution of an acid
The acid in question has $\mathrm{p}K_\mathrm{a}$ about 1.29. Density of 98% w/w solution is $d=\pu{1.323 g/cm^3}$. I would like to find the number of undissociated acid molecules ($\ce{HX}$), water ...
- 41
2
votes
1
answer
666
views
Salt Hydrolysis
Referring to this, when "hydrolysis of a salt" is its reaction with water:
How is it that both the cation and anion of the salt are reacting in an equal amount with water?
To state this specifically ...
- 21
7
votes
1
answer
4k
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$K_{eq} $ vs $K_c$
I was wondering if there was a difference between $K_{eq}$ and $K_c$. I think they both refer to the Equilibrium Constant. If I'm wrong, could you please tell me the difference between the two? Thanks!...
- 173
9
votes
1
answer
3k
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Simultaneous equilibria
Rephrasing:
The following reactions are a small example of my big system
$$(1)\ \ce{A + B <=> AB}$$
$$(2)\ \ce{AB -> CB}$$
$$(3)\ \ce{A -> C}$$
$$(4)\ \ce{C + B <=> CB}$$
with
$$\...
- 321
8
votes
1
answer
2k
views
How to calculate the equilibration time of two connected chambers of salt solution, initially at different concentrations?
I am trying to build a system of two connected chambers, one of which is also connected to a cuvette, so I can perform a spectrometry experiment with different concentrations of $\ce{KNO3}$ solution. ...
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