Question

the bond angleHOH in H3O+is greater than H bond angle in NH3​

Answer 1

Answer:

In both H2O and H3O^+, the oxygen atom is sp3 hybrid. The H-O-H angle in H3O^+ ion is about 113° (broader than the “canonical” tetrahedral angle of about 109.5°), while in water it is about 104.5° (narrower than 109.5°). The broadening of the angle in H3O^+ vs H2O can be ascribed to two facts: 1) one lone electron pair is less effective than two in pushing the H atoms closer to each other; 2) owing to lower electronegativity of hydrogen with respect to oxygen, the positive charge is placed in a delocalized fashion on the three hydrogen atoms, which pushes the same “partly” charged atoms apart from each other, thus broadening the H-O-H angle.