Understanding Net Ionic Equations

Hello, my name is Robert Smith and I'm with New River Community College's Academic Assistance, and today we are discussing net ionic equations. So we're given the task of writing the net ionic equation for the chemical equation given above. So let's get started. The first thing you're going to want to do with ionic equation is anytime you see something as either aqueous or Specifically aqueous, you'll want to split it up into its respective ions or complex ions. Anything that's solid or liquid, you'll want to leave alone as its own creature. It does not split off into its respective ions. So when we rewrite this, we break up the lead from the nitrate. the potassium from the iodine all on the reactant side and then on the product side we'll split off the potassium from the nitrate so we can rewrite this as pb which is lead and it has a plus 2 charge or 2 plus as your book describes it and it would be aqueous you want to note the state And then there would be two nitrate ions, which has a minus one charge. It's aqueous. Two potassium ions, and they have a plus one charge. Aqueous. Two iodine ions, which have a minus one charge. Again, we're getting the charges from its position on the periodic table. The nitrate is a complex ion, and it has a minus one charge. And then, so that's our reactants. Then we have our products, which again, the solid stays the same, PbI2s for solid, plus two potassiums, aqueous, and two nitrates. Also alias and we get that from the two coefficient in front of the potassium nitrate So when you're looking at this, you'll see some common species on both sides. And those are called spectator ions, and they cancel each other out. So your two NO3s, your two nitrates, cancels with the two nitrates on its opposite side. The two potassiums in the reactants cancel with the two potassiums in the products. So once the spectators have dropped out, we can then rewrite the equation that is the net ionic equation, which would be PV plus 2I. Yields PBI 2, or lead ion. And I'll have you note that the charges do cancel out on this. Lead has a plus 2 charge, or 2 plus charge. And iodine has a minus 1 charge. But there are two iodines. So it's two positives cancels with two negatives. And that's why our lead iodide does not have a charge attached to it. And that's our net ionic equation.

Anything that's solid or liquid, you'll want to leave alone as its own creature. It does not split off into its respective ions. So when we rewrite this, we break up the lead from the nitrate.

the potassium from the iodine all on the reactant side and then on the product side we'll split off the potassium from the nitrate so we can rewrite this as pb which is lead and it has a plus 2 charge or 2 plus as your book describes it and it would be aqueous you want to note the state And then there would be two nitrate ions, which has a minus one charge. It's aqueous. Two potassium ions, and they have a plus one charge.

Aqueous. Two iodine ions, which have a minus one charge. Again, we're getting the charges from its position on the periodic table. The nitrate is a complex ion, and it has a minus one charge.

And then, so that's our reactants. Then we have our products, which again, the solid stays the same, PbI2s for solid, plus two potassiums, aqueous, and two nitrates. Also alias and we get that from the two coefficient in front of the potassium nitrate So when you're looking at this, you'll see some common species on both sides. And those are called spectator ions, and they cancel each other out.

So your two NO3s, your two nitrates, cancels with the two nitrates on its opposite side. The two potassiums in the reactants cancel with the two potassiums in the products. So once the spectators have dropped out, we can then rewrite the equation that is the net ionic equation, which would be PV plus 2I.

Yields PBI 2, or lead ion. And I'll have you note that the charges do cancel out on this. Lead has a plus 2 charge, or 2 plus charge. And iodine has a minus 1 charge. But there are two iodines.

So it's two positives cancels with two negatives. And that's why our lead iodide does not have a charge attached to it. And that's our net ionic equation.

Transcript for:Understanding Net Ionic Equations

Transcript for:
Understanding Net Ionic Equations