Is NH4Br polar or nonpolar? – Polarity of NH4Br
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The question is –
Is NH4Br polar or nonpolar?
Answer:
⇒ NH4Br is a polar molecule.
Explanation:
Ammonium bromide (NH4Br) is a polar ionic compound composed by oppositely charged ammonium (NH4+) and bromide (Br–) ions held together by strong electrostatic forces of attraction.
All ionic compounds are polar in nature.
NH4+ is a non-polar molecular ion itself. It consists of four N-H bonds.
Each N-H bond is polar as it consists of an electronegativity difference of 0.84 units between the single covalently bonded nitrogen (E.N = 3.04) and hydrogen (E.N = 2.20) atoms.
The individual N-H dipole moments get canceled equally in opposite directions in the symmetrical tetrahedral shape.
Thus, it is overall non-polar (net µ = 0).
However, it carries a formal charge equal to +1.
When it gets strongly held by an equal but oppositely charged halide (Br–) ion, it results in an overall polar NH4+ Br– unit cell.
Consequently, NH4Br is polar with a non-uniformly distributed charge density.
Also, check –
⇒ How to identify polar or nonpolar compounds?
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