Benzoic acid is a common food preservative. the pka of benzoic acid is 4.20. what is true of the relative strengths of benzoic acid (ba) and its conjugate base (b-)?

Respuesta :

BA( benzoic acid )  is stronger than B-( benzoate ) because the Ka >Kb .

Benzoic acid :

benzoic acid is a organic compound with molecular formula C6H5COOH.

It is a weak acid .it is a white crystalline solid .

it is soluble in water .

the benzoic acid can be produce by oxidation of toluene with oxygen .

the crystal structure is monoclinic .

benzoic acid used in toothpaste , mouthwash and facewash .it is used as food preservative .

it is used in manufacture  of dyes and insect repellants .

it is used in cosmetic products .also used in pharmaceuticals because of its medicinal benefits .

Strong acid :

Acids which dissociate almost completely in aqueous solutions thus producing a large number of H+  ions are called strong acids .

example : HCl , H2SO4 , HNO3 , etc.

Weak acid :

Acids which dissociate to a small extent at ordinary dilution to give low concentrations of H+ ion or H3O+ ions are called weak acids .

examples : CH3COOH , HCN, HF, etc.

Conjugate acid -base pairs :

when an acid loses a proton , the residual part of it will have a tendency to accept  a proton . Thus , it will behave as a base . such pairs of substances which differ from one another by a proton are known as conjugate acid-base pairs .

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