Questions tagged [equilibrium]
The state in which both reactants and products are present at concentrations which have no further tendency to change with time.
1,730
questions
2
votes
1
answer
68
views
How much additional product forms when small amounts of reactants are added to a reaction at equilibrium?
I am not able to understand how to determine the exact amount of additional product formed when additional reactant is added to an equilibrium reaction.
For example consider the reaction:
$$\ce{CO2 +...
1
vote
2
answers
715
views
How would I find the molarity/concentration of a gas using pV = nRT?
The problem I'm working on is:
At $\pu{1100 K}$ and a total pressure of $\pu{1 atm}$, $\ce{SO3}$ is $75.0\%$ dissociated.
$$\ce{2SO3(g) <=> 2SO2(g) + O2(g)}$$
Assume $\pu{1.00 mol}$ of $\ce{SO3}...
2
votes
0
answers
58
views
Phase diagram of ammonium hydrosulfide, a volatile salt
Salts (ionic compounds) usually have low volatility due to the strong ionic bond.
However, there are exceptions. Smelling salts decompose and release ammonia gas.
What is "volatile"?
If a ...
5
votes
0
answers
5k
views
Should I round an experimentally determined reaction order to an integer?
For a lab experiment I did, I calculated the reaction order for one of the reactants using data from two trials, both rates, and the concentration of that reactant during each.
$$
\frac{\text{Rate}_1}{...
8
votes
1
answer
1k
views
What is 'spray foam' or 'expanding foam'?
At the wikipedia are:
Spray foam (expanding foam in the UK) is a chemical product created by two materials, isocyanate and polyol resin, which react when mixed with each other and expand up to 30-60 ...
2
votes
1
answer
67
views
Does solubility product dictate predominant precipitate from the solution with several ionic compounds?
While removing temporary hardness through boiling, magnesium bicarbonate will give $\ce{Mg(OH)2}.$ $\ce{Mg(OH)2}$ predominates over $\ce{MgCO3}$ as the solubility product $K_\mathrm{sp}$ of $\ce{Mg(OH)...
3
votes
1
answer
95
views
Calculation of Reaction Extent as a Function of Pressure and Temperature: Issue with Activity-Based Approach
I'm working on modeling reactions involving combinations of hydrogen (H), nitrogen (N), and strontium (Sr) elements. I've obtained the temperature-dependent Gibbs free energy of formation, enthalpy, ...
0
votes
4
answers
3k
views
Is vapour pressure of a liquid solution constant at a given temperature, no matter the size of closed container and amount of liquid taken?
Does vapour pressure of a liquid solution depend on the size of the closed container, the amount of solution taken, given that, the temperature is kept constant? Or will it change if some extra gas is ...
0
votes
0
answers
32
views
Understanding the relationship between Delta G and Kp, Kx and Kc
**Upon reading the chapter about equilibrium from my physical chemistry book, I was convinced that
ΔG=−RTln(Kp)(1)
and that
Kp=Kx(P∑v)(2)
where Kp
is the equilibrium constant with respect to pressure ...
2
votes
1
answer
93
views
Equilirium mixture of nitrogen dioxide and its dimer
When an equilibrium mixture of gaseous, colorless $\ce{N2O4}$ and brown $\ce{NO2}$ is warmed at constant volume, which of the following is correct?
The density remains constant.
The degree ...
2
votes
2
answers
147
views
Boiling point, pressure, and Gibbs free energy
The water boiling process can be represented by the equation:
$$ \ce{H2O(l) → H2O(g)} \tag{1} $$
Since free energy depends on pressure
$$ \left(\frac{\partial G}{\partial P}\right)_T = V \tag{2} $$
...
-2
votes
1
answer
102
views
Solubility of lead carbonate
Lead nitrate reacts with sodium carbonate to form lead carbonate, if sodium carbonate is in excess will the white precipitate of lead carbonate dissolves ? Like in lead nitrate reaction with excess of ...
0
votes
1
answer
137
views
Calculation of Kc
Gaseous hydrogen and gaseous iodine react together to form hydrogen iodide.
H2 + I2 ⇌ 2HI
The graph shows how the amount of hydrogen iodide varies with time in a 1.00 dm3
container.
The initial ...
25
votes
2
answers
13k
views
Why does water dissociate to H3O+ and OH- rather than H+ and OH-?
Why does water dissociate to
$\ce{H3O+ + OH-}$
instead of $\ce{H+ + OH-}$?
This question came to surface when I was learning about acids and bases, and learned this definition:
$\mathrm{pH=}-\log_{10}[...
0
votes
2
answers
238
views
Finding the molar ratio at equilibrium
Consider the reaction $\ce{SO_2_{(g)} + \frac{1}{2} O_2_{(g)}\longrightarrow SO_3_{(g)}}$. What effect is there on the molar ratio $\frac{n_{SO_3}}{n_{SO_2}}$ at equilibrium if the pressure is ...