What is the formula of nickel (ll) nitrate hexahydrate? (a) NiNO3.6H2O (b) Ni2NO3.6H2O (c) Ni (NO3) 2.6H2O (d) NiNO3.12H2O e) Ni (NO3) 2.12H2O

The formula of nickeI (II) nitrate hexahydrate is

Ni (NO3) 2.6H2O

So option (c) is correct.

C) Ni (NO₃) ₂.6H₂O

Explanation:

Given:

Formula name : nickel (II) nitrate hexahydrate

To determine:

The molecular formula

Explanation:

In the given compound:

Nickel is a transition metal with the symbol Ni and occurs as a cation

Nitrate is a polyatomic anion with a charge - 1 i. e. NO₃⁻

The roman numeral 'II' implies that the oxidation state of Ni is + 2

Since the compound is neutral the charge on the cation and anion needs to be balanced. As a result the molecular formula is: Ni (NO₃) ₂

Hexahydrate implies that there are six (hexa) molecules of water of hydration

The formula is therefore: Ni (NO₃) ₂.6H₂O