DAT destroyer-Gen chem problem #23

[snake3]

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Hey guys,

Could anyone explain me what exactly is an spectator ion? how do I recognize it? I got even more confused with the salts that are with the solutions for this problem in the back. Can anyone give me a hint on how to approach them?
Thank you so much!!!

 

[IsRaEl21]

2Na+(aq) + 2Cl−(aq) + Cu2+(aq) + SO42−(aq) → 2Na+(aq) + SO42−(aq) + CuCl2 (S)
The Na+ and SO42− ions are spectator ions since they remain unchanged on both sides of the equation. They simply "watch" the other ions react, THEY DON'T CHANGE. DR. ROMANO HAS A VERY GOOD EXPLANATION ON IT IN THE DESTROYER. HOPE I HELPED.

 

[Decan]

A spectator ion does not take part in the reaction (which is why it is appropriately called a 'spectator'). Write down the entire equation and pay close attention to states of matter. Spectator ions will not change their states of matter.

For example, lets take a look at AgNO3 (aq) + NaCl (aq)

The reaction would produce: AgCl (s) + NaNO3 (aq)

Ag+ (aq) + NO3- (aq) + Na+ (aq) + Cl- (s) --> AgCl (s) + Na+ (aq) + NO3- (aq)

From this, you can see that NO3- and Na+ did not change their states of matter and are therefore spectator ions. Your net ionic equation would be:

Ag+ (aq) + Cl- (s) --> AgCl (s)

Hope that helps!

 

[poc91nc]

Know your solubility rules! Very very very important!!!

Once you get your solubility rules down....it'll all make sense.

 

[snake3]

Thanks guys!!! it was very helpful!!!