 Since dissociation is not an essential preliminary to neutralization, aprotic solvents are often added to 'ionizing' solvents to depress solvolysis (which is comparable to hydrolysis) of the neutralization product and so sharpen the endpoint.Protophilic solvents are basic in character and react with acids to form solvated protons.A weakly basic solvent has less tendency than a strongly basic one to accept a proton.