Question

select the two products of the double replacement reaction below?

zn(no₃)₂(aq) + li₃po₄(aq) -->??? +???

li₃(no₃)₂(aq)

zn₃(po₄)₂(s)

znpo₄(s)

lino₃(aq)

Explanation:

Step1: Write the general form of double - replacement reaction

In a double - replacement reaction \(AB + CD
ightarrow AD+CB\). Here, \(A = Zn^{2 +}\), \(B=NO_3^{-}\), \(C = Li^{+}\), \(D = PO_4^{3-}\).

Step2: Balance the charges for the new compounds

For the compound formed by \(Zn^{2+}\) and \(PO_4^{3 -}\): Using the criss - cross method, the formula is \(Zn_3(PO_4)_2\) (since \(2\times3 = 3\times2\) for charge balance: \(3\times(+ 2)+2\times(-3)=0\)). For the compound formed by \(Li^{+}\) and \(NO_3^{-}\), the formula is \(LiNO_3\) (since \(+1+( - 1)=0\)).

Step3: Consider solubility rules

Nitrates (\(NO_3^{-}\)) are generally soluble in water, so \(LiNO_3\) is in aqueous (\(aq\)) form. Phosphates (\(PO_4^{3-}\)) of most metals (except Group - 1 metals like \(Li\)) are insoluble, so \(Zn_3(PO_4)_2\) is a solid (\(s\)).

Answer:

B. \(Zn_3(PO_4)_2(s)\), D. \(LiNO_3(aq)\)