Why has Monochloroethanoic acid higher pKa value than Dichloroethanoic acid?

Monochloro ethanoic acid has a higher pKa value than dichloro ethanoic acid because of the decrease in the electron density on the carbon of dichloro ethanoic acid caused by the increased negative inductive effect due to two chlorine groups as compared to one.

Why is Monochloroethanoic acid weaker than Dichloroethanoic acid?

Monochloroethanoic acid (ClCH2COOH) has only one chlorine atom with-I effect while dichlorethanoic acid (Cl2CHCOOH) has two chlorine atoms. Therefore, monochloroethanoic acid has pKa value (2.87) than dichloroethanoic acid (1.26) and it is a weaker acid.

Is benzoic acid stronger than trichloroacetic acid?

Hence we can say that chloroacetic acid will be a stronger acid than benzoic acid. Note: Remember that if Electron withdrawing group is there in the structure of the conjugate base, then it will decrease the electron density on the negatively charged oxygen atom and that will stabilize it.

Why is Ethanoic acid weaker than benzoic acid?

The ethanoic acid (pKa = 4.76) is weaker acid than benzoic acid (pKa = 4.19 ). Due to the presence of benzene ring in benzoic acid, delocalisation of electron makes it more acidic than ethanoic acid but such stabilization is not present in ethanoic acid.

Why benzoic acid is stronger than Ethanoic acid?

Benzoic acid is the stronger acid compared to ethanoic acid. This is due to the delocalisation of the lone pair of electrons on the oxygen atom into the benzene, increasing the polarity of the -OH bond and thus makes the cleaving of the H+ ion easier.

Why is benzoic acid more acidic?

How are pKa and pKb values related to strength of acids and bases?

A large Kb value indicates the high level of dissociation of a strong base. A lower pKb value indicates a stronger base. pKa and pKb are related by the simple relation: pKa + pKb = 14.

Why do strong acids have low pKa?

Strong acids are defined by their pKa. The acid must be stronger in aqueous solution than a hydronium ion, so its pKa must be lower than that of a hydronium ion. Therefore, strong acids have a pKa of <-174.

Which acid is a weaker acid than benzoic acid?

Formic acid is stronger than benzoic acid because it has a lower pKa value. Formic acid does not have such a group of electron donors and is stronger than acetic acid. Formic acid is also a stronger acid than acetic acid.