Multiply coefficient for NaCl by 2. 1 CaCl 2 + 1 Na 2 CO 3 = 1 CaCO 3 + 2 NaCl. Na is balanced: 2 atoms in reagents and 2 atoms in products. C is balanced: 1 atom in reagents and 1 atom in products. O is balanced: 3 atoms in reagents and 3 atoms in products. All atoms are now balanced and the whole equation is fully balanced: CaCl 2 + Na 2 CO 3 ...