We are asked to find the pH of a buffer solution of Dinitrophenol and NaOH,with the necessary data given.
Do they react at 1:1 ratio? What would be the products?
Yes, they react 1:1. the phenol group (OH) becomes ONa (as the salt or base) and the H combines with the OH of the NaOH to form water. So the dinitrophenol is the acid and the sodium salt is the base.
Thank you!
To determine the pH of a buffer solution of Dinitrophenol and NaOH, we need to first understand the reaction between them. Dinitrophenol is a weak acid, while NaOH is a strong base. In an acid-base reaction, the acid donates a proton (H+) to the base, forming water and a salt.
The reaction between Dinitrophenol and NaOH can be represented as follows:
Dinitrophenol (acid) + NaOH (base) → Water + Salt
Since Dinitrophenol is a weak acid and NaOH is a strong base, the reaction occurs in a 1:1 ratio, meaning that for one mole of acid, one mole of base is needed. The products of the reaction are water and a sodium salt of Dinitrophenol.
Now, let's address how to find the pH of the buffer solution. A buffer solution consists of a weak acid and its conjugate base (or a weak base and its conjugate acid). It resists changes in pH when small amounts of acid or base are added to it. In this case, Dinitrophenol acts as the weak acid in the buffer solution, and its conjugate base is formed by the reaction with NaOH.
To determine the pH of the buffer solution, we need to know the concentrations of Dinitrophenol and its conjugate base, as well as the pKa value of Dinitrophenol (which indicates its acidity).
Once we have this information, we can use the Henderson-Hasselbalch equation, which is:
pH = pKa + log[(concentration of conjugate base)/(concentration of acid)]
Using the given data, you will need to know the concentrations of Dinitrophenol and its conjugate base, as well as the pKa value of Dinitrophenol, in order to apply the Henderson-Hasselbalch equation and determine the pH of the buffer solution.