Question

question 9 of 25 what is the correct formula for the compound formed by ca2+ and no2 -? a. ca2(no)2 b. ca2no2 c. ca(no2)2 d. cano2

Explanation:

Step1: Determine charge balance

The calcium ion ($Ca^{2 + }$) has a charge of +2 and the nitrite ion ($NO_{2}^{-}$) has a charge of -1. To form a neutral compound, the total positive charge must equal the total negative charge.

Step2: Calculate number of ions

We need 2 nitrite ions ($NO_{2}^{-}$) to balance the +2 charge of one calcium ion ($Ca^{2+}$).

Answer:

C. $Ca(NO_{2})_{2}$