You have made 1.00 l of an aqueous buffer solution that is 100 mm in both sodium acetate and acetic acid. what is the ph?

pH = pKa = 4.75

Explanation:

The pH of a buffer solution is calculated using Henderson Hassalbalch's equation.

The equation is:

Where

pKa = -log (Ka) = 4.75 [for acetic acid]

[salt] =  concentration of salt or the conjugate base, in the given example it is sodium acetate

[acid] = concentration of acid , here it is acetic acid

As given that the concentration of both the salt and acid is same it means

Thus the pH of solution will be equal to its pKa.

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.