Question

for the following double replacement reaction, complete the reaction including the correct products. ca(no3)2 + k2co3 →

Explanation:

Step1: Recall double - replacement reaction rules

In a double - replacement reaction \(AB + CD
ightarrow AD+CB\). Here, \(A = Ca^{2 +}\), \(B=NO_{3}^{-}\), \(C = K^{+}\), \(D = CO_{3}^{2-}\).

Step2: Form the products

The products are formed by exchanging the ions. For the cation - anion combination:

• \(Ca^{2+}\) combines with \(CO_{3}^{2 -}\) to form \(CaCO_{3}\) (since the charge balance: \(1\times(+ 2)+1\times(-2)=0\)).
• \(K^{+}\) combines with \(NO_{3}^{-}\) to form \(KNO_{3}\). But we need to balance the chemical equation.

The un - balanced equation is \(Ca(NO_{3})_{2}+K_{2}CO_{3}
ightarrow CaCO_{3}+KNO_{3}\).
For the nitrate and potassium ions, we have 2 \(NO_{3}^{-}\) in \(Ca(NO_{3})_{2}\) and 2 \(K^{+}\) in \(K_{2}CO_{3}\). So we need 2 \(KNO_{3}\) to balance the equation.

Answer:

\(Ca(NO_{3})_{2}+K_{2}CO_{3}
ightarrow CaCO_{3}+2KNO_{3}\)