Chemistry, 02.10.2019 21:30, Redeyestudio53

What is the relationship between a weak acid and a buffer? give me an example and explain how a weak acid can act as a buffer?

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answered: rome58

Explanation:

Buffer solutions are solutions capable of maintaining their pH at approximately constant values when small amounts of acid or base are added.

A buffer solution is characterized by simultaneously containing a weak species and its conjugate pair. In other words, it has a weak acid and a salt of the same acid from a strong base or, a base and a salt of this base from a strong acid.

Two examples are:

Mixture of acetic acid and sodium acetate Ammonium Hydroxide and Ammonium Chloride

Given that the buffer solution is a mixture of weak acid with a salt of the same acid from a strong base, the acid will be partially dissociated according to the equation:

HA ⇔ $H^{+} + A^{-}$

Applying the Law of Mass Action (which establishes the relationship between the masses of reagents and products in a chemical equilibrium at a given temperature) and taking into account the dissociation constant( $Ka=\frac{[A^{-}]*[H^{+}] }{[HA]}$ ) is obtained the following expression:

$pH=pKa+log\frac{[A^{-} ]}{[HA]}$

Where pKa represents the potential value of the acid acid constant of the weak acid, $[A^{-} ]$ is the common anion concentration, equivalent to salt and [HA] indicates weak acid concentration which is part of the buffer solution. Consequently, the above equation can be rewritten as follows:

$pH=pKa+log\frac{salt}{acid}$

According to this equation, the pH of a solution buffer, depends on two factors:

a) The pKa value of the weak acid

b) The proportions between salt and acid concentrations

In summary, the presence of the conjugate pair causes the weak species to dissociate to a lesser extent and the presence of the weak species causes the conjugate pair to hydrolyze less.

answered: Guest

c, liquids evaporate, creating a gas

answered: Guest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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What is the relationship between a weak acid and a buffer? give me an example and explain how a wea...