The dissolution of salt in water is basically a physical process and the law of conservation of mass which states that mass can neither be created nor destroyed applies. The mass of each component before dissolution will be same after dissolution.
When one pound of salt is dissolved in 20 pounds of water, the resulting solution will weigh 1+20 pounds.
The data curve for OCI-/H3O appears to be similar to C2H3O2-/H3O because protons have not dissociated with conjugate base. This conjugate base is strong and hold proton in solution while acids try to dissociate it.
