Question

Although NH3 and water both have distorted tetrahedral geometries but bond angle in NH3 in water is less than ammonia. why?

Answer 1

Hi friend,

Here is your answer.....

As per vsepr theory,

Bond angle for tetrahedral geometry =109°28'

But for ammonia =107° and for water it is 104° and has distorted tetrahedral structure that you may know.....

Now according to your question "WHY WATER HAS LESSER BOND ANGLE THAN AMMONIA???"

REASON:-

As per Vsepr theory ,the repulsion is in the order of

Bp -Bp<Bp -lp <Lp -Lp

Now come to the point,

N has 5 valence and it bonded with three hydrogen "with 1 lone pair of e-"

But water has "2lone pair of electrons"

Because of higher 2lp repulsions will be be high and the bond angle gets reduced.

Hope this helps you a little!!!!!