Calculating Q

205389184
Posts: 100
Joined: Sat Sep 07, 2019 12:18 am

Calculating Q

When calculating Q, how come we include aqueous substances?

Nicholas Chin 1G
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Re: Calculating Q

Calculating Q is the same as calculating for K, which means you include all aqueous solutions and gases, and disregard liquids/solids.

MingdaH 3B
Posts: 133
Joined: Thu Jul 11, 2019 12:17 am

Re: Calculating Q

Q calculations are only for aqueous solutions and gases, by definition.

Philomena 4F
Posts: 27
Joined: Wed Feb 27, 2019 12:16 am

Re: Calculating Q

Q is calculated the same way as K = [P]/[R], including only the aqueous/gas molecules. Though Q is determined for reactions that are not in equilibrium state.

Samuel Tzeng 1B
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: Calculating Q

Since the activity of solids and liquids are equal to 1, they aren't included in the calculation of Q and K, this leaves only gases and aqueous substances

Cavalli_1H
Posts: 92
Joined: Thu Sep 19, 2019 12:15 am

Re: Calculating Q

Q is calculated the same way as K, and K includes gases and aqueous solutions for its calculation

505306205
Posts: 97
Joined: Thu Jul 25, 2019 12:15 am

Re: Calculating Q

Calculating Q is the same as calculating K.

SVajragiri_1C
Posts: 115
Joined: Thu Jul 11, 2019 12:16 am

Re: Calculating Q

The rule is to include all aqueous solutions and gases, just like you would to calculate K.

sarahartzell1A
Posts: 56
Joined: Fri Sep 28, 2018 12:17 am

Re: Calculating Q

You include the aqueous solutions.

Kayli Choy 2F
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: Calculating Q

Additionally, calculating Q is important because it can be compared to K in order to determine the direction the reaction is proceeding. When Q=K, the reaction is at equilibrium composition.

preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: Calculating Q

You calculate Q the same way as you'd calculate K, using the gases and aqueous substances involved in the reaction. The only difference between Q and K is that Q can be different values since it can be calculated at any point during the reaction, while the K for a reaction at a specific temperature/pressure is always constant since it is the value of the ratio of concentrations/partial pressures of products to reactants at equilibrium.

Caroline Zepecki
Posts: 101
Joined: Fri Aug 09, 2019 12:16 am

Re: Calculating Q

For calculating either Q or K, every time you online include gasses or aq. Never solids or solvents in the calculations

faithkim1L
Posts: 105
Joined: Fri Aug 09, 2019 12:17 am

Re: Calculating Q

When you calculate Q, you use the exact same process as if you were calculating for K. This means that you include all aqueous solutions and gases. Do not include solids or liquids in your calculations for Q (or K for that matter).

ThomasNguyen_Dis1H
Posts: 102
Joined: Fri Aug 30, 2019 12:17 am

Re: Calculating Q

Q is calculated the same way as K so you include aqueous and gas in the calculation for Q

Zaynab Hashm 2I
Posts: 110
Joined: Wed Sep 11, 2019 12:15 am
Been upvoted: 1 time

Re: Calculating Q

We calculate Q the same way we calculate K, and we account for both aqueous and gaseous states. However, liquids and solids are disregarded when calculating the constants. The only difference is that Q indicates the change in the reaction/system at any time before reaching equilibrium, but K is at equilibrium.

Joanne Lee 1J
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Calculating Q

We include aqueous solutions because Q is calculate the same way as K and K includes aqueous solutions.

Uisa_Manumaleuna_3E
Posts: 60
Joined: Wed Sep 21, 2016 2:56 pm

Re: Calculating Q

Q and K require aqueous solutions because their concentrations do change in the system depending on the rate of reaction