# 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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### Why does the pressure equilibrium constant exist? [duplicate]

Since $K_c$ can already be used for calculating the equilibrium constant for a reaction involving gases, but $K_p$ cannot be used for calculating the equilibrium constant for a reaction involving ...
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### Why isn't standard Gibbs free energy always zero?

I read in my textbook that one of the standard conditions we should use when calculating the standard Gibbs free energy is having a concentration of 1 M of all the reagents and the products in the ...
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### Apparent contradiction in the type of deviation of an ethanol-water mixture

For a mixture of $\ce{EtOH}$ and $\ce{H2O}$: $\Delta H_{\text{mix}} < 0$ (exothermic) and $\Delta V_{\text{mix}} < 0$ (volume contraction). This means that the unlike interactions are stronger ...
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### Can a zeroth order reaction be reversible?

After recently studying about chemical equilibrium, I was convinced that the forward and backward reaction rates meet each other at equilibrium. However thinking about zeroth order reaction annoyed ...
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### Calculating the change in pH upon diluting an acid

What volume of water is added to $\pu{400 ml}$ of $\ce{HCL}$ solution so that the pH of the solution increases by 1 unit This is how far i went but the answer says $\pu{1000 ml }$ where am I wrong is ...
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### How to justify this contradiction in acid-base equilibrium of methanol and water? [duplicate]

Let's talk about the following compounds - water and methanol. We know that methanol is slightly more acidic than water, because water's ability to donate a proton as an acid is reduced due to ...
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### 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 ...
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### What is the meaning of 'mass action'?

I understand the statement of 'Law of mass action', but I don't understand clearly what 'mass action' means. I investigated it and found the following descriptions. The law was originally suggested ...
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### Is chemical equilibrium possible at any temperature and pressure?

Consider the chemical reaction ${\rm Na+Cl\to NaCl}$ by mixing ${\rm Na}$ with ${\rm Cl}$ (or by mixing ${\rm NaOH}$ with some acid). This process is exothermic while the reverse ${\rm NaCl\to Na+Cl}$ ...
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### What causes both components of a binary gas mix to condensate at the same time for a given composition

Okay, so recently I encountered the temperature - mole fraction diagrams for binary vapour-liquid equilibrium. For now, I only consider two-component systems where the components are very similar and ...
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### The Ionization of Water [closed]

When we put $\ce{HCl}$ in a container of water and let's say that the concentration we put is $10^6$ molar. Let me understand this calculation: $[\ce{OH-}]=x$ $[\ce{H+}]=10^6+x$ $x(10^6+x)=10^{-14}$ ...
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### Why does adding water to a saturated solution increase the number of ions present in the solution?

In my book, it is stated that when some water is added to a test tube having a saturated $\ce{Ag2SO4}$ solution, with its solid at equilibrium, the number of $\ce{Ag}$ ions in the solution increases. ...
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### Find the half equivalence point

How to find the half equivalence point knowing the pH, molarity, titrant added at equivalence point? This a fairly straightforward and simple question, however I have found many different answers to ...
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### Is it right to compare the molarity of a substance with the probability of its molecules reacting?

I was watching this video on Khan Academy (about the equilibrium constant), and the analogy that they made really got me thinking. I wanted to verify whether it was completely correct, or just an ...