All Questions
7
questions
4
votes
1
answer
159
views
Why is the van ’t Hoff relation an approximation?
Lately, I've been looking and thinking about the fact that a professor told us in an advanced physiology lecture. When it came to mentioning osmotic pressure and the van ’t Hoff relationship
$$
\pi = ...
- 41
4
votes
1
answer
8k
views
How is the formula of mean activity coefficient derived?
The mean activity coefficient is defiend as follows:
$$\gamma_\pm = (\gamma_+\gamma_-)^{1/2}.\tag{1}$$
If Debye-Hückel equation
$$-\log\gamma_i = 0.5z_i^2\mu^{1/2}\tag{2}$$
is used, then the mean ...
- 143
4
votes
4
answers
4k
views
Why does the degree of dissociation change when we dilute a weak acid even though the equilibrium constant is constant?
$K$ represents the ratio of concentrations of molecules in a solution at equilibrium, which means that $Q_\mathrm{r}$ (that ratio at any given point) looks to be identical to $K$. In other words, the ...
-1
votes
1
answer
436
views
Doesn't Ostwald's law of dilution contradict Le Chatelier's principle?
By Le Chatelier's principle, increasing the concentration of a weak electrolyte brings out more ions.
By Ostwald's dilution law, increasing the concentration of a weak electrolyte brings out less ...
- 1
3
votes
3
answers
3k
views
Proof of Dynamic Nature of Equilibrium
Here is how my textbook proves that dissolution of solid in liquid is dynamic in nature. It considers the example of a saturated solution of sugar. It says that,
Though the solution is in ...
- 31
6
votes
1
answer
43k
views
Degree of association, van't Hoff factor and dissociation constant
$\ce{CH3COOH->CH3COO- + H+}$
\begin{array}{c|c c c}
\mathbf{Initial} & \mathrm{1~mol} & \mathrm{0~mol} & \mathrm{0 ~mol} \\\hline
\mathbf{Final} & \mathrm{1-\alpha ~mol}&...
- 719
12
votes
4
answers
9k
views
Why do solutions become saturated?
Why can a solvent dissolve only a particular amount of solute?
If we add more solute to the solution, the number of solute particles in contact with water increases. So rate of dissolution should ...
- 863