Calculating Q

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

Calculating Q

Postby 205389184 » Sun Jan 12, 2020 9:04 pm

When calculating Q, how come we include aqueous substances?

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

Re: Calculating Q

Postby Nicholas Chin 1G » Sun Jan 12, 2020 9:05 pm

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

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

Re: Calculating Q

Postby MingdaH 3B » Sun Jan 12, 2020 9:08 pm

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

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

Re: Calculating Q

Postby Philomena 4F » Sun Jan 12, 2020 9:09 pm

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

Postby Samuel Tzeng 1B » Sun Jan 12, 2020 9:09 pm

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

Postby Cavalli_1H » Sun Jan 12, 2020 9:11 pm

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

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

Re: Calculating Q

Postby 505306205 » Sun Jan 12, 2020 9:31 pm

Calculating Q is the same as calculating K.

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

Re: Calculating Q

Postby SVajragiri_1C » Sun Jan 12, 2020 11:00 pm

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

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

Re: Calculating Q

Postby sarahartzell1A » Sun Jan 12, 2020 11:06 pm

You include the aqueous solutions.

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

Re: Calculating Q

Postby Kayli Choy 2F » Wed Jan 15, 2020 10:39 am

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

Postby preyasikumar_2L » Wed Jan 15, 2020 11:09 am

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
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Joined: Fri Aug 09, 2019 12:16 am

Re: Calculating Q

Postby Caroline Zepecki » Wed Jan 15, 2020 1:31 pm

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

Postby faithkim1L » Wed Jan 15, 2020 1:48 pm

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

Postby ThomasNguyen_Dis1H » Wed Jan 15, 2020 2:13 pm

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

Zaynab Hashm 2I
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Re: Calculating Q

Postby Zaynab Hashm 2I » Wed Jan 15, 2020 2:22 pm

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
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Joined: Thu Jul 25, 2019 12:15 am

Re: Calculating Q

Postby Joanne Lee 1J » Wed Jan 15, 2020 4:03 pm

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

Postby Uisa_Manumaleuna_3E » Thu Jan 16, 2020 3:16 pm

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


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