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Specific Notation

Posted: Wed Jan 23, 2019 2:09 pm
by NatBrown1I
Does it matter whether or not when you're calculating K to use this notation [PCl5] or this notation P PCl5 ?

Re: Specific Notation

Posted: Wed Jan 23, 2019 2:34 pm
by Kristen Kim 2K
If PCl5 is aqueous, I would use [PCl5], and if PCl5 is gaseous, use P PCl5. Unless they specify to find partial pressure, I would just use the concentration notation.

Re: Specific Notation

Posted: Wed Jan 23, 2019 2:34 pm
by 2c_britneyly
Yes, if you're dealing with a reaction that involves only gases it is more correct to use Pgas, but if you're calculating for a reaction that involves an aqueous solution, you should use hard brackets to indicate Kc.

Re: Specific Notation

Posted: Wed Jan 23, 2019 4:15 pm
by Sarah Fatkin 4I
You should get the same K value regardless of which notation you use; however, partial pressure is usually used for gases and concentration is usually used for solutions. Hope this helps!

Re: Specific Notation

Posted: Wed Jan 23, 2019 10:23 pm
by Mya Majewski 1L
pay attention if the problem gives you Kc or Kp, then you know which to use!

Re: Specific Notation

Posted: Thu Jan 24, 2019 12:08 am
by Vicky Lu 1L
Notation does matter when calculating K. Use brackets when dealing with concentration such as [PCl5]. Brackets are not require if you write out the value of the concentration of PCl5. As for the gaseous states, you don't not use brackets. If you want, you can use parentheses around P PCl5 like so (P PCl5).