# 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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According to wikipedia, Henry constants define the ratio between the aqueous and gas fraction of a chemical species at equilibrium. Lets consider Henry constants H in atm.L.mol-1 such that $[C]_{g} = ... 0answers 166 views ### How to without calculations understand the liquid-liquid extraction efficiency? I'm asking myself this question for a very long time and I haven't found a simple an good explanation yet for the fact that it's better (if you want to clean them) to wash your hands two times with ... 1answer 45 views ### Rate of a reaction [duplicate] We know that the rate of a reaction$\ce{aA + bB -> cC + dD}$, the rate of the forward reaction is given by$r_\mathrm f = k_\mathrm f[\ce A]^p[\ce B]^q$where$ a\neq p$and$ b\neq q$according ... 1answer 172 views ### Why don't buffer solutions return to equilibrium? Suppose I want to make a buffer solution in any of the three ways possible with dihydrogen phosphate as my weak acid. In the first way, a certain ratio of the weak acid and its conjugate base are ... 3answers 87 views ### Equilibrium for very small amounts of reactants Is there any difference in the concept of equilibrium when it comes down to dealing with extremely small amounts of reactants? Say we have $$\ce{A + B <=> C + D}$$ and$K_c$is$100,000$. If ... 2answers 105 views ### How does the equilibrium shift when concentration of reactant and product are increased simulatenously Before answering my question, take a look at this example $$\ce{2NOCl <=> 2NO + Cl2}$$ Let's suppose I have 2 mol/l$\ce{NOCl}$, 2 mol/l$\ce{NO}$, and 1 mol/l$\ce{Cl2}$in a closed system. ... 1answer 65 views ### How do I calculate the amount of polyprotic acid and base needed to achieve a certain buffer pH? e.g. Citric Acid and Trisodium Citrate$\ce{H3C6H5O7 <=>[ka_1] H2C6H5O7- + H+ <=>[ka_2] HC6H5O7^2- + H+ <=>[ka_3] C6H5O7^3- + H+}$Using the definition of Ka and substituting for ... 0answers 44 views ### Limiting factor on Belousov-Zhabotinsky reaction In the thin film Belousov-Zhabotinsky reactions (popular on Youtube/in chemistry demonstrations), concentric rings of different colors propagate across a petri dish for minutes to hours as the ... 0answers 61 views ### Reason for formation of bubbles at boiling point [duplicate] As I understand it, boiling takes place when the saturated vapour pressure equals to the atmospheric pressure. But, why does the vapour pressure need to be equal to the atmospheric pressure for ... 1answer 89 views ### Heat generation in exothermic reactions [duplicate] Im thinking specifically of N2 + 3 H2 ⇌ 2 NH3. Its an exothermic reaction, therefore heat is generated. Im trying to understand how Chateliers principle interacts with this reaction. I understand that ... 2answers 372 views ### Calculate pH of a mixture of a strong base and acid. Knowing only the pH, wt/v%, and volume of both solution. [closed] Title explains all. I have been stuck on this for an hour and for some reason cannot understand it. I have tried to do an ICE table but get stuck halfway as I do not know whether I would use the w/v ... 1answer 269 views ### Why doesn't pH = pKa1 in the buffer zone for this titration? Below is an image from my textbook representing the titration curve for the titration of$5.00\ \mathrm{mL}$of$0.010\ \mathrm M\ce{H2S2O3}$with$0.010\ \mathrm M\ce{KOH}$, which has$\mathrm ...
There is a problem I found online for practice that I cannot solve: Problem Methane, $\ce{CH4}$, emerges from a $1\ \mathrm{cm}$ diameter nozzle at a rate of $120\ \mathrm{cm^3/s}$ and a mole ...