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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Chemical equilibrium question

Q1.At 25 degree Celusius and 1 atm , the partial pressures in an equilibrium mixture of N2O4 and NO2 are 0.7 and 0.3 respectively. Calculate their partial pressures when they are at equilibrium at ...
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2answers
36 views

Finding initial pressure in a chemical equilibrium

Consider the equilibrium below. If $K = 4$ and initial pressures of $\ce{CO}$ and $\ce{H2O}$ are equal, giving a total pressure of $1.5~\mathrm{bar}$ at equilibrium. What was the initial pressure of ...
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25 views

chemical equilibrium [on hold]

Q1. What weight of solid ammonium carbonate when vaporised at 200degreeC will have a volume of 8.96 litre at 1 atm ? Assume that solid completely decomposes into CO2 and NH3 at 200degreeC and 1 atm ...
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292 views

How do I calculate the amount of NaOH required to mix with a weak acid to get a given pH? [closed]

Calculate how many $\mathrm{mL}$ of a $0.1~\mathrm{M}$ $\ce{NaOH}$ solution was added to a titration mixture of $100~\mathrm{mL}$ of $0.1~\mathrm{M}$ $\ce{HCOOH}$ ($\mathrm{p}K_a = 3.75$) solution to ...
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2answers
31 views

Effect of addition of inert gas in reaction at equilibrium

Can anyone please explain dissociation reaction increases with the addition of an inert gas? I am still new to the topic equilibrium so please explain in simple words.
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2answers
25 views

Effect of temperature on equilibrium

Why is exothermic reactions are favoured by low temperature while endothermic reactions are favoured by high temperature?
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24 views

Equilibrium involving ions [closed]

Is NaH2PO4 a buffer? If so, how? A solution contains 20 mmoles of H3PO4 and 10 mmoles of NaH2PO4. How many mmoles of NaOH must be added to convert all the phosphate to HPO41-ions?
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33 views

Equilibrium constant and reaction Quotient

does reaction quotient After equilibrium has been achieved make any sense? At equilibrium point rates of forward and backward reaction are same and the system is in dynamic equilibrium.The graph of ...
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44 views

Are there actually any reactions during which STATIC equilibrium is reached, as opposed to dynamic?

Static would be where a set amount of both products and reactants is formed. Dynamic would be where both the forward and backward reactions occur at equal rates, meaning no change in the overall ...
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2answers
48 views

Why is equilibrium achieved at different stages of a reaction?

In other words, I want to know why some reactions attain equilibrium early in the reaction while some reactions obtain equilibrium at the end of the reaction. Why is this the case?
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2answers
20 views

Actual meaning of equilibrium

What is actually meant by that concentration of reactants and products remain constant in equilibrium?
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1answer
50 views

Buffer action of borax

How does a mixture of borax and boric acid act as an acidic buffer? Please also describe the mechanism of its buffer action.
8
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1answer
100 views

How can a protein folding transition state have zero lifetime?

I'm doing a module on my Biochemistry course looking at protein folding, and in a discussion of [folding] transition states I was a little confused at the thought of a zero-lifetime transition state - ...
2
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2answers
37 views

Can assumptions made during calculation of ka of buffer solutions be justified?

We make many assumptions in sciences which are not always true but as they make little difference we ignore them for simplicity. But today I have decided that I can no longer be lured into using ...
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0answers
11 views

How do you calculate the proportion of ammonia produced from different pressures in the Haber process using the equilibrium equation?

I tried to write a increase in pressure to twice as much like this: $$\frac{2(x+1)^2}{(0.5-0.5x)2(1.5-1.5x)^3}=K$$
3
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1answer
34 views

Finding the equilibrium constant Kₚ, when temperature is given

At $1000~\mathrm{K}$, $K_p = 1.85$ for the reaction. $$\ce{SO_2 + \frac{1}{2}O_2 <=> SO_3}$$ What is the value of $K_p$ for the reaction $$\ce{SO_3 <=> SO_2 + ...
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1answer
32 views

Why is the water column empty in ICE table

In the ICE table pure solids and liquids have a value of one in the equilibrium expression but when we create an ICE table, why is the $\ce{H_{2}O}$ column empty? Should it not have a value of one?
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2answers
220 views

Determining if reaction is endothermic or exothermic using equilbrium constant

For the following reaction: $$W_{(s)}+4\,Br_{(g)}\rightleftharpoons WBr_{4(g)}$$ At 900 K, $K_{p}=100$ and at 2800 K, $K_{p}=5$. At higher temperatures, the equilibrium has shifted towards the ...
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1answer
32 views

Applying the Le chateliers principle

I am an issue understanding the changes that take place when we decrease the pressure of a reaction. I have understood that when we increase the pressure the side having more number of moles wants ...
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1answer
34 views

Where can I find Equilibrium Constants?

When trying to develop mathematical models to show the concentration in a reaction, where can one find a database or good source of known equilibrium constants if it is not necessarily very convenient ...
2
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1answer
66 views

Why is the equilibrium constant given in litre per mole?

At $800\:\mathrm{K}$ a reaction mixture contained $0.5\:\mathrm{mol}$ of $\ce{SO2}$, $0.12\:\mathrm{mol}$ of $\ce{O2}$ and $5\:\mathrm{mol}$ of $\ce{SO3}$ at equilibrium. $K_c$ for the equilibrium ...
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0answers
46 views

Name the equation $\Delta G=\Delta G^{\circ}+RT \ln Q$

As the title states, what is the name of the equation $$\Delta G=\Delta G^{\circ}+RT \ln Q$$ My textbook does not explicitly state the name and I could not find anything on google.
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1answer
39 views

Determining vapor pressure from equilibrium constant

The reaction is $$CoCl_{2(s)}+6\,H_{2}O_{(g)}\rightleftarrows [Co(H_{2}O)_{6}]Cl_{2(s)}$$ Note that the reaction is at equilibrium. I have determined the value of $K_{p}=5.5\times10^{12}$. The next ...
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1answer
30 views

What does (heated) mean in a chemical equation?

I'm supposed to balance the following equation: $\text{Potassium chlorate (heated) --> Potassium chloride + Oxygen}$ But I don't understand what the (heated) means in front of the first element. ...
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0answers
25 views

Analytically combining Dynamic Equilibria that have a two way affect?

Lets say I want to model a water system as the following set of equilibria: $\ce{H2O <=> OH- + H3O+}$ | $\ce{A=[OH^{-}][H3O+]}$ $\ce{CO2 + H2O <=> H2CO3}$ | ...
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1answer
168 views

Acid-base equilibrium of NH4CN

I'm having difficulties understanding this problem. We have in the problem that $K_a$ for $\ce{HCN} = 6.2\cdot10^{-10}$ and $K_b$ for $\ce{NH3} = 1.8\cdot10^{-5}$. Write chemical equations to ...
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3answers
100 views

Why is the equilbrium constant expressed the way it is?

Why are the two molarity's multiplied and not added and why is each raised to the power of the coefficient rather than multiplied by it? What is the reasoning behind this form? Was it simply ...
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2answers
26 views

Finding the value of stoichiometric coefficient x

$\ce{2A_{(s)} + xB_{(g)} <=> 3C_{(g)}}$ $K_p=19.3, K_c=0.45, T=523K$ I work $\Delta n$ to be 1, So would $x$ be 1 or 2? I'm not sure if the coefficient is part of $\Delta n$.
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1answer
51 views

Relationship between rate equation and equilibrium constant

I have read mannaia's answer on the question of 'rate order and confusion', as well as Nicolau Saker Neto's answer to a related question. They have both been very helpful. As I understand, the ...
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2answers
31 views

Find the color of the solution

The acid-base indicator methyl red has a $K_{a}$ = $1 \times 10^{-5}$. Its acidic form is red while its alkaline form is yellow. If methyl red is added in a colorless solution with a $pH = 7$, the ...
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1answer
41 views

Equilibrium Graphs

What if I2 and H2 began at the same concentration - then do we start at the same point? ... or is it acceptable to start at different concentrations...
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1answer
25 views

Equilibrium Practical Discussion Help

I understand the theory, but am struggling to answer the following discussion questions: (i) Why isn't this represented by: Fe3+ (aq) + 3 SCN- (aq) <-> Fe(SCN)3 (aq) Why do we dilute the ...
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265 views

Calculating pH of diprotic and amphoteric solutions

I am trying to understand this problem and its corresponding solution (complete solution not shown) First off, from the above one can see that the equilibrium constants when $\ce{H2ASO4-}$ ...
2
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1answer
51 views

4 Compounds in Equilibrium with One Another - Determine Their Equilibrium Concentrations

I know that if I have two compounds in equilibrium and I know $\ce{\Delta G}$, then I can use $$\ce{\Delta G=-RTlnK}$$ to determine the concentrations of the two components at equilibrium. I have 4 ...
3
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1answer
60 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 ...
2
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1answer
56 views

Is there a database which give reaction constant?

For instance, I have a chemical reaction like : $$\ce{Fe^{2+} + $0.5$O2 + H^{+} ->Fe^{3+} + $0.5$ H2O}$$ And I would like to use Action-Mass law, but I need to have equilibrium constant for this ...
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1answer
38 views

How to create a buffer solution from NaOH and $\ce{CH3COOH}$?

In my chemistry book, they say that an approach to making a buffer solution of pH$=5.09$ is by adding an appropriate amount of strong base($0.052$ mol $\ce{NaOH}$) to $0.300L$ of $0.025 M$ ...
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1answer
39 views

Formation Constants; Lewis Acidity

I still distinctly remember reading about how Lewis acidity/basicity was characterized using kinetics. The reason given was that because formation constants are so large, these reactions are not ...
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1answer
21 views

Does Le Chatelier's principle apply to the gas inside an air mattress?

While sleeping on an air mattress yesterday a thought occurred to me. I had to re-inflate the air mattress since it was getting rather low and after it had a good stiffness to it, I went to sleep. The ...
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1answer
14 views

How does temperature affect equilibrium, according to Le Chatelier's principle?? [closed]

I want to understand this concept in detail. I am getting confused with increase in temperature backward reaction takes place or forward?? And how?? Proper explanation is needed.
4
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1answer
136 views

Why are solids and liquids not included in the equilibrium constant? What about in a reaction rate calculation?

Take for instance the rection $$\ce{H2(g) + I2(s) -> 2HI(g)}$$ The equilibrium constant would not include the solid $\ce{I2}$, but why is this? I have read that its concentration is a constant, ...
2
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1answer
161 views

Units for dissociation constant and relationship to Gibbs Free Energy

How does one "convert" between an equilibrium constant calculated from the Gibbs free energy for a dissociation reaction and experimentally determined dissociation constants? $$ \Delta ...
5
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1answer
92 views

How can we justify setting the affinity $\sum_i \mu_i \nu_i$ equal to zero at chemical equilibrium?

Let $\sum_A \nu_A A \rightarrow \sum_B \nu_B B$ be a general reaction whose progress during time interval $dt$ is measured by $d\zeta$, so the amount of reactants consumed and products generated in ...
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2answers
52 views

Carbonate Equilibrium Question: Finding concentration using concentration ratio and number of moles of acid

Lake water contains dissolved sodium carbonate and sodium hydrogen carbonate. The following equilibrium exists: $\ce{HCO3- <=> H+ + CO3^{2-}}$ $\frac{\ce{[CO3^{2-}]}}{\ce{[HCO3-]}} = 0.958$ ...
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0answers
17 views

A Question on Chemical Equilibrium [duplicate]

There's a property of the equilibrium constant that when we calculate the equilibrium constant for a reversible reaction, say it is $k_{1}$, and now we write the same equation by all the ...
4
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1answer
78 views

How to calculate the pH of a buffered solution with Henderson Hasselbalch?

Lets say you have a buffered solution containing $0.50~\mathrm{M}$ acetic acid ($K_a = 1.8 \cdot 10^{-5}$) and $0.50~\mathrm{M}$ sodium acetate, and you want to calculate the $\mathrm{p}\ce{H}$ of ...
2
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3answers
180 views

If all chemical processes are equilibria at least to some extent, where does the activation energy come from?

If all chemical processes are equilibria at least to some extent, then where does the energy to overcome the activation energy come from? Is a process with a very high activation energy (i.e. the ...
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1answer
213 views

How much carbonation is in one liter of commercial fountain coke-cola

From what I understand generally coke is carbonated to roughly 6.2g per liter in bottles and cans, or 3.1 volumes of CO2. I was watching this video because I was curious about how fountain soda ...
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2answers
42 views

What is true about this equation, at equilibrium, and why?

${H}_2O(s)\leftrightharpoons{H}_2O(l)$ A) the mass of ice must equal to the mass of water B) the mass water and the mass of ice each remain constant
2
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3answers
66 views

Specific question about multiple choice question

I have searched for this answer on line but I cannot find an answer. I know this is a Le Chatelier's principle question. The question: $\ce{2NO(g) + H_2(g) <=> N_{2}O(g) + H_{2}O} + ...