Calculate the pH when 25.0ml of 0.90M CH3COOH is mixed with 25.0ml of 0.45M NaOH.

pH of mixed solution = 4.3

A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.  

The buffer solution can be acidic or basic  

Acid buffer solution consists of weak acids and their salts.  

valence according to the amount of salt anion  

mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol

mol NaOH = 25 ml x 0.45 = 11.25 mlmol

ICE method :

Reaction

NaOH + CH₃COOH ---> CH₃COONa + H₂O

11.25       22.5

11.25       11.25                       11.25        11.25

               11.25                        11.25        11.25

mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵

Then [H⁺]=

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.