Mullis 1 Steps for Net Ionic Equations Write

Steps for Net Ionic Equations Write the chemical formula equation. 2. Decide which are

Net ionic equations (quick way) Includes only those compounds and ions that undergo chemical

Net ionic equations (textbook way) Includes only those compounds and ions that undergo chemical

Net ionic equations--Examples Potassium sulfate and barium nitrate make a solid precipitate, Ba. SO

HNO 3 and Na. OH are mixed in chemically equivalent quantities. What is the

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Mullis 1

Steps for Net Ionic Equations Write the chemical formula equation. 2. Decide which are strong electrolytes and put a line between the anion and the cation. Also, show the charge of the ion. 3. If the species is not a strong electrolyte, draw a box around it so you will remember to leave it as a compound. 4. Cancel the spectator ions. 1. Mullis 2

Net ionic equations (quick way) Includes only those compounds and ions that undergo chemical change in a reaction in an aqueous solution. l Ions that do not take part in the reaction and are found in solution both before and after are spectator ions. Ex: Pb(NO 3)2 + 2 KCl Pb. Cl 2+ 2 KNO 3 l All are soluble except lead(II)chloride, so: Pb 2+/ NO 3 - + K+/Cl- Pb. Cl 2 + K+/NO 3 - Net ionic equation (cross out spectators on both sides): Pb 2+ + 2 Cl- Pb. Cl 2 Mullis 3

Net ionic equations (textbook way) Includes only those compounds and ions that undergo chemical change in a reaction in an aqueous solution. l Ions that do not take part in the reaction and are found in solution both before and after are spectator ions. Ex: Zinc nitrate and ammonium sulfide make a solid precipitate, Zn. S. Zn(NO 3)2 (aq) + (NH 4)S (aq) Zn. S(s) + 2 NH 4 NO 3 (aq) l Overall ionic equation: Zn 2+ + 2 NO 3 - + 2 NH 4 + + S 2 - Zn. S + 2 NH 4+ + 2 NO 3 - Net ionic equation (cross out spectators on both sides): Zn 2+ + S 2 - Mullis Zn. S 4

Net ionic equations--Examples Potassium sulfate and barium nitrate make a solid precipitate, Ba. SO 4. K 2 SO 4 (aq) + Ba(NO 3)2(aq) Ba. SO 4(s) + 2 KNO 3 (aq) Overall ionic equation: 2 K++ SO 42 - + Ba 2+ + 2 NO 3 - Ba. SO 4 + 2 K+ + 2 NO 3 Net ionic equation (cross out spectators on both sides): SO 42 - + Ba 2+ Ba. SO 4 Mullis 5

HNO 3 and Na. OH are mixed in chemically equivalent quantities. What is the correct formula equation, overall ionic equation and net ionic equation? HNO 3(aq) + Na. OH(aq) Na. NO 3(aq) + H 2 O (l) Overall ionic equation: H 3 O+ + NO 3 - + Na+ + OH- Na+ + NO 3 - + 2 H 2 O (l) Net ionic equation (cross out spectators on both sides): H 3 O+ + OH- 2 H 2 O (l) Mullis 6