When the butanol is protonated, it is ionic and hence more soluble in water. C4H9-OH + H2SO4 ===> C4H9-OH2(+) + HSO4- The conjugate acid is a polar cation more compatible with the watery than with the organic phase of the mix. Solution When the butanol is protonated, it is ionic and hence more soluble in water. C4H9-OH + H2SO4 ===> C4H9-OH2(+) + HSO4- The conjugate acid is a polar cation more compatible with the watery than with the organic phase of the mix..