## Denoting brackets/parentheses

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Alyssa Wilson 2A
Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

### Denoting brackets/parentheses

Can someone please clarify when we use brackets vs. parentheses to denote materials in the gas law?

Rachana Jayaraman 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

### Re: Denoting brackets/parentheses

I think brackets are usually used to denote concentration, such as [J] is the concentration of solution/gas J, whereas parentheses are used to show that you are multiplying values. In the ideal gas law, Dr. Lavelle used brackets when rewriting the formula as P = [conc.]RT, but for calculations it shouldn't matter.

904936893
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

### Re: Denoting brackets/parentheses

I'm pretty sure brackets indicate concentration so for Kc [H20] indicates the concentration of water, but with Kp you have (PCl2). You don't need brackets to indicate concentration for this because the P indicates the pressure of the gas. I hope this helps!

Summer de Vera 2C
Posts: 65
Joined: Fri Sep 28, 2018 12:16 am

### Re: Denoting brackets/parentheses

My T.A. said that brackets indicate concentrations while parentheses are for calculating the K of partial pressure. It would be incorrect to do [Pco2] for example because you'd be trying to calculate the concentration of a partial pressure, which isn't correct.

Jason Ye 2I
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

### Re: Denoting brackets/parentheses

Brackets are for concentration and parentheses are for states of matter and other things within chemical notation I think.

Jason Ye 2I
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

### Re: Denoting brackets/parentheses

Brackets are for concentration and parentheses are for states of matter and other things within chemical notation I think.

Luis_Yepez_1F
Posts: 50
Joined: Fri Sep 28, 2018 12:18 am

### Re: Denoting brackets/parentheses

Brackets are primarily used to denote that the element is in concentration, parentheses are just used for partial pressures.

Posts: 38
Joined: Fri Sep 28, 2018 12:22 am

### Re: Denoting brackets/parentheses

You would use the brackets to denote concentrations or molarity and use parentheses to indicate partial pressure

AlyssaBei_1F
Posts: 99
Joined: Fri Sep 28, 2018 12:17 am

### Re: Denoting brackets/parentheses

Brackets are only used when dealing with concentration.

Kaylee Kang 1G
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

### Re: Denoting brackets/parentheses

Brackets are typically used to denote concentration!