We’ll go over this example in video form.. We’re asked to name the compound with the formula Au, NO 3 in brackets, 3. Name the compound with the formula.

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Presentation transcript:

We’ll go over this example in video form.

We’re asked to name the compound with the formula Au, NO 3 in brackets, 3. Name the compound with the formula Au(NO 3 ) 3

We see that Au(NO 3 ) 3 has 3 elements (click) gold, nitrogen, and oxygen. Any ionic compound with more than two elements must contain a polyatomic ion. Au(NO 3 ) 3 3 Elements Name the compound with the formula Au(NO 3 ) 3

So we look for polyatomic ions in the formula Au(NO 3 ) 3 Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

NO3 comes from (click) the nitrate ion, NO3 minus. Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

Gold is a singe metal but its not on the Positive Ion section of the table here. Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

But it is found here, quite low in the middle section of the periodic table Au(NO 3 ) 3 Name the compound with the formula Au(NO 3 ) 3

We can start writing the name: the metal is (click) gold, and the polyatomic ion is (click) nitrate Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – gold(III) nitrate

Because gold has more than one possible charge we have to indicate the charge (click) with a roman numeral Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – gold(III) nitrate roman numeral

Is the charge positive 3 or positive 1 and (click) what is the roman numeral? Here’s how we find the charge on gold… Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – gold(III) nitrate roman numeral ? ? ?

The formula tells us we have one gold ion Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 –

And 3 nitrate ions. Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 –

Each nitrate ion has a charge of negative 1, so the total negative charge is 3 times negative 1, (click) which is negative 3 Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

The positive and negative charges (click) must be balanced. Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

So the total positive charge must be positive 3. There is only one gold ion, Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

So the charge on this gold ion (click) must be positive 3 Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3

The roman numeral represents the charge on one gold ion, so (click) the roman numeral is, (click) Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3 gold(III) nitrate ?

3 Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3 gold(III) nitrate

So the name of this compound is gold (III) nitrate. Au 3+ NO 3 – +4 –4 Name the compound with the formula Au(NO 3 ) 3 NO 3 – –3 Total Negative Charge Total Positive Charge +3 gold(III) nitrate Name

So the final answer is (click) the name of this compound is gold (III) nitrate. Name the compound with the formula Au(NO 3 ) 3 gold(III) nitrate