Question

what is the insoluble product of this precipitation reaction? zn(no₃)₂(aq) + na₂co₃(aq) → neither product is soluble. znco₃ 2nano₃ both products are soluble.

Explanation:

Step1: Identify the reaction type

This is a double - displacement reaction. The general form of a double - displacement reaction is \(AB + CD
ightarrow AD+CB\). For the reaction \(Zn(NO_{3})_{2}(aq)+Na_{2}CO_{3}(aq)
ightarrow\), the products will be \(ZnCO_{3}\) and \(NaNO_{3}\) (after balancing the equation: \(Zn(NO_{3})_{2}(aq)+Na_{2}CO_{3}(aq)
ightarrow ZnCO_{3}(s)+2NaNO_{3}(aq)\)).

Step2: Recall solubility rules

• Nitrate salts (\(NO_{3}^-\)) are generally soluble. So \(NaNO_{3}\) (sodium nitrate) is soluble in water.
• Carbonate salts: Most carbonate salts are insoluble, except for those of group 1 metals (like \(Na^+\), \(K^+\) etc.) and ammonium (\(NH_4^+\)). Zinc (\(Zn^{2 +}\)) is not a group 1 metal, so \(ZnCO_{3}\) (zinc carbonate) is insoluble.

Answer:

B. \(ZnCO_{3}\)