Question

question 1 (1 point)
what is the correct balanced net ionic equation for the reaction:
fe(no₃)₂(aq) + ni(s) → fe(s) + ni(no₃)₂(aq)
2fe²⁺(aq) + 3ni(s) → 2fe(s) + 3ni²⁺(aq)
3fe²⁺(aq) + 2ni(s) → 3fe(s) + 2ni²⁺(aq)
fe²⁺(aq) + ni(s) → fe(s) + ni²⁺(aq)
fe(no₃)₂(aq) + ni(s) → fe(s) + ni(no₃)₂(aq)
2fe(no₃)₂(aq) + 3ni(s) → 2fe(s) + 3ni(no₃)₂(aq)

Explanation:

Step1: Identify Strong Electrolytes

First, we recognize that \( \text{Fe(NO}_3\text{)}_2 \) and \( \text{Ni(NO}_3\text{)}_2 \) are soluble ionic compounds (strong electrolytes) and will dissociate into ions in aqueous solution. \( \text{Fe(NO}_3\text{)}_2 \) dissociates into \( \text{Fe}^{2+}(\text{aq}) \) and \( 2\text{NO}_3^-(\text{aq}) \), and \( \text{Ni(NO}_3\text{)}_2 \) dissociates into \( \text{Ni}^{2+}(\text{aq}) \) and \( 2\text{NO}_3^-(\text{aq}) \). The solid metals (Ni and Fe) do not dissociate.

Step2: Write the Complete Ionic Equation

The complete ionic equation is:
\( \text{Fe}^{2+}(\text{aq}) + 2\text{NO}_3^-(\text{aq}) + \text{Ni}(\text{s})
ightarrow \text{Fe}(\text{s}) + \text{Ni}^{2+}(\text{aq}) + 2\text{NO}_3^-(\text{aq}) \)

Step3: Cancel Spectator Ions

The \( \text{NO}_3^- \) ions are spectator ions (they appear on both sides of the equation) and can be canceled out.

Step4: Write the Net Ionic Equation

After canceling the spectator ions, the net ionic equation is:
\( \text{Fe}^{2+}(\text{aq}) + \text{Ni}(\text{s})
ightarrow \text{Fe}(\text{s}) + \text{Ni}^{2+}(\text{aq}) \)

We also check the balancing: the number of each atom and the charge are balanced. On the left, Fe is \( +2 \), Ni is 0. On the right, Fe is 0, Ni is \( +2 \). The charge balance: left side total charge is \( +2 \) (from \( \text{Fe}^{2+} \)) + 0 (from Ni) = \( +2 \). Right side total charge is 0 (from Fe) + \( +2 \) (from \( \text{Ni}^{2+} \)) = \( +2 \). Atoms: 1 Fe, 1 Ni on both sides. So it is balanced.

Answer:

\( \boldsymbol{\text{Fe}^{2+}(\text{aq}) + \text{Ni}(\text{s})
ightarrow \text{Fe}(\text{s}) + \text{Ni}^{2+}(\text{aq})} \) (corresponding to the option \( \text{Fe}^{2+}(\text{aq}) + \text{Ni}(\text{s})
ightarrow \text{Fe}(\text{s})+\text{Ni}^{2+}(\text{aq}) \))