# Tag Info

### Why do we say the position of equilibrium is shifted even when K is the same?

Is there any specific definition of position of equilibrium? No, it is a fuzzy concept and not very helpful. When a reaction is at equilibrium, there is a certain composition of the equilibrium ...
Accepted

### Why can't the product of an acid reacting with water react with water itself and produce OH-?

It definitely does. Let's simplify it to a monoprotic acid (like acetic acid, $\ce{CH3COOH}$), which I'll just represent as $\ce{HA}$ for simplicity. In a solution of the acid, you will have all of ...
Accepted

### Experimental evidence for zwitterions

That is a very difficult problem worth a PhD project in physical chemistry. Intially, I thought one could try capillary electrophoresis at different pHs and if the analyte travels with the ...

### What is the basis for the relationship of Gibbs energy and extent of reaction shown in this graph?

What an interesting question! I was perplexed when I first read this. And then I remembered what my professor told me in college, that is, "when in doubt, read." So, I read and found an ...
Accepted

### What is the basis for the relationship of Gibbs energy and extent of reaction shown in this graph?

The Gibbs energy for a system at a fixed pressure and temperature, is only a function of the concentration of the species. We write it in a differental form $$dG = \sum_j \mu_j dn_j \tag{1}$$ Our ...

### Can ICE tables give two answers?

Scenarios leading to a quadratic equation have two mathematical solutions, real or complex. But, one of them often does not have interpretation in scientific context, as it's value is out of the ...
Accepted

### Effect of inert gas on the rate of reaction

At otherwise the same partial pressure of the reacting gas, an inert gas slows down heterogenous reactions of a gas with condensed phases. It is caused by local additional decreasing of partial ...

### What is the basis for the relationship of Gibbs energy and extent of reaction shown in this graph?

UPDATE: In the comments to this and other answers, the question came up why the Gibbs energy of mixing is related to chemical reactions. In a chemical reaction, reactant turns into product (or vice ...
Accepted

### How does enzyme velocity decrease as reaction quotient approaches equilibrium constant?

The Michaelis-Menten mechanism is the following: \begin{align} \ce{E + S &<-->[$k_1$][$k_{-1}$] ES} \tag{R1} \\ \ce{ES &->[$k_2$] P + E} \tag{R2} \end{align} If you apply: (1) ...

### How to determine the charge of amino acid at certain pH?

Behaviour of amino acids in water solution Amino acids exist in the solution in the form of zwitterions (molecules that contain an equal number of positively and negatively charged functional groups). ...
Accepted

### Equilibrium constant magnitude for concentration vs. pressure

This is a classical scaling issue. For example, is a $1$ ton object lighter than a $100$ milligram object? The rule that $K>1$ or $K<1$ should not be taught because it will lead to exactly the ...

### Why is the voltage produced by a voltaic cell affected by temperature as described by the Nernst Equation?

Both terms of the difference in the Nernst equation depend on the temperature. $$E = E^\circ - \frac{R T}{z F} \ln Q$$ The second term obviously depends on temperature because it contains the ...