Name: Hydrogen Halides
Uploaded: 2019-07-19
Duration: 4 min 9 s
Description: Hydrogen halides are usually acidic, but do you know which among them is the most stable acid? Let's see the relation between the stability and acidic nature...

Question

Why the bond angles in

{PH}_{4}^{+}

is more than

{NH}_{3}

?

Accepted Answer

In ${NH}_{3}$ , $N$ is ${sp}^{3}$ hybridised. It has three bond pairs and one lone pair and due to the strong bond pair-lone pair repulsion, the bond angle decreases from a regular tetrahedral angle of $109 ° 28'$ to $107 °$ . As a result, ammonia has a pyramidal shape.

And ${PH}_{4}^{+}$ forms by the reaction of ${PH}_{3}$ with proton. And the structure of ${PH}_{4}^{+}$ is given below,

Since ${PH}_{4}^{+}$ has four bond pairs but no lone pair due to this there is no lone pair-bond pair repulsion. Only identical bond pair-bond pair interactions exist. Therefore, the bond angle in ${PH}_{4}^{+}$ is a regular tetrahedral angle of $109 ° 28'$ , that is more than the bond angle present in ${NH}_{3}$ .

Why the bond angles in ${PH}_{4}^{+}$ is more than ${NH}_{3}$ $?$

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Why the bond angles in PH4+ is more than NH3?