Questions tagged [equilibrium]
The state in which both reactants and products are present at concentrations which have no further tendency to change with time.
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How can adding a strong base to a weak base be the same as a strong base in solution problem?
In professor's lecture on acid-base titration, professor says (at this point of the video, link should start about the time she says it) adding a strong base to a weak base should be treated as a ...
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Iodine/iodide electrochemistry help
I have an electrochemistry experiment with iodine in solution.
I am initially wanting to quantify the iodide in solution and extrapolate the concentration of I2(aq) and I3-(aq) in solution from this ...
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How does cell potential change with temperature for positive enthalpy and negative entropy?
A recent United States National Chemistry Olympiad question asked:
A certain voltaic cell has a standard cell potential that increases with increasing temperature. Which best explains this ...
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Derivation of Gibbs phase rule
I learnt about the Gibbs phase rule a while back but did not really think too much about how it was derived. I am now currently looking back at the derivation provided in the textbook and I realised ...
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How does the phase equillibrium graph of H2O2 look like? [closed]
Please help me with the Phase equilibria graph of H2O2 (Pressure vs Temp), can't seem to find it anywhere.
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pKa of acetic acid in pure NH3?
Acetic acid completely dissociates in liquid ammonia and I would like to know the $\mathrm{p}K_\mathrm{a}$ value for the acid in that solvent. Can anybody point me to a reference?
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Why do fluoride ions "win" over thiocyanate ions in a solution with iron ions?
When you mix aqueous iron(III) nitrate and potassium thiocyanate together you get a red solution. Then if you add sodium fluoride, the red colour disappears.
This is basically because the $\ce{Fe(...
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Bicarbonate concentration in the RO permeate
I am facing a challenge since long ago, but have not been able to find a suitable solution for it. Please share your thoughts if you have the knowledge or experience in this area.
I am running an RO ...
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Does copper(II) hydroxide dissolve in ammonia solution?
According to University of Oregon — Chemistry Interactive Demonstrations and Educational Resources — Copper-Ammonia Complex, the equilibrium constant for the formation of copper(II) hydroxide is ...
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Drug dosage determination using dynamical systems
I am a Mathematical Biology student, and recently I have read about various approaches, such as Ordinary Differential Equations (ODEs), used to determine the exact drug dosage and treatment sessions ...
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What is the reason behind atoms/molecules in reversible reactions reverting back to its reactant state even if they have found stability? [closed]
If atoms and molecules aim for stability and equilibrium, then why do they feel the need to revert back into their original state once they have already found stability?
Example: $\ce{I2 + H2 \to 2HI}$...
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If a pocket of nitrogen gas is pumped in at the bottom intake of a padded tank will the pocket of gas bubble up?
I have a nitrogen gas padded tank (tank 1) which is filled from the bottom of the tank. Tank has a set point of 30 psi which adjusted as tank level changes. Also at the inlet is an additional pipe ...
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Effect of Pressure on Equilibrium
This might be a little bit of a basic question, but I've been trying to get my head around pressure and Le Chatelier's principle and I can't quite understand it.
Currently, my understanding of Le ...
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Why does balancing the reduction of dichromate(VI) to chromium(III) require four water molecules among the products?
Problem
Balance the following chemical equation using oxidation numbers:
$$\ce{Cr2O7^2–(aq) + HNO2(aq) –> Cr^3+(aq) + NO3–(aq)}$$
Solution (in Swedish)
$$\ce{\overset{+VI}{Cr}_2O7^2–(aq) + H\...
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How is dG=0 employed to describe equilibrium in constant volume systems?
GIBBS ENERGY
Here's the derivation of how dG=0 describes equilibrium state:
$$\Delta S_{\text{system}} + \Delta S_{\text{surrounding}} > 0$$
$\implies\Delta S_{\text{system}} + \frac{-Q}{T_{\text{...
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