## Search found 11 matches

Wed Dec 03, 2014 1:48 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Quiz 3 WB #10
Replies: 6
Views: 1097

### Re: Quiz 3 WB #10

904472058 wrote:How do you solve x for the equilibrium constant??

To solve for x, do the ICE box:

E for: 2BrCl= .54 + 2x; Br2= 4.9-x; Cl2=7.6-x

Use the initial pressures to find Kp: (4.9)(7.6)/(1.08)^2= 31.9

Then: 31.9= (4.9-x)(7.6-x)/(.54+2x)^2

Using the quadratic formula, you get .25 for x.
Wed Dec 03, 2014 1:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: concentrations' effect on K
Replies: 3
Views: 364

### Re: concentrations' effect on K

Adding to what Justin said: K would not increase or decrease because K is constant; Q, however, would change because it's a value from any point during the reaction. If you're looking to see whether the products or reactions are favored, then you'd look at the relationship between Q and K. Q<K: reac...
Wed Dec 03, 2014 1:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 Prep, Fall 2012 #8
Replies: 6
Views: 769

### Re: Quiz 3 Prep, Fall 2012 #8

Polly wrote:Why was the .28 atm halved before put in the ice table as the initial for 2HI?

It was halved because the problem says half of HI (.28 am) is removed; thus the NEW initial concentration is .14, not .28. You do not use the old concentration to calculate anything.
Wed Dec 03, 2014 1:20 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 Preparation Fall 2013 Quiz: #10
Replies: 9
Views: 1514

### Re: Quiz 3 Preparation Fall 2013 Quiz: #10

First, solve for K with the initial conditions, (7.6)(4.9)/(1.08) 2 will give you K=31.927 Next make your ICE table for the change 2BrCl <---> Br 2 + Cl 2 I .5(1.08) 4.9 7.6 C + 2x -x -x E .54 + 2x 4.9 -x 7.6-x now you solve for X 31.927= (4.9-x)(7.6-x)/(.54+2x) 2 X= .025 .54 + 2(.25) = 1 bar Why i...
Wed Dec 03, 2014 1:09 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quiz 3 Prep Fall 2013 #1
Replies: 3
Views: 3696

### Re: Quiz 3 Prep Fall 2013 #1

You are given the INITIAL concentrations of N2 and H2. At equilibrium, [NH3]= .15 M; that means that the initial concentration is 0. Thus, for the change in concentration: NH3 will have +2x, N2 will have -x, and 3H2 will have -3x. (This is also a forward reaction so the products will have +x)
Wed Dec 03, 2014 12:37 pm
Forum: Naming
Topic: Knowing whether the compound has net neutral charge or not
Replies: 7
Views: 917

### Re: Knowing whether the compound has net neutral charge or n

But if it does have "ion" at the end of the name, how are you supposed to figure out the positive or negative charge?
Tue Dec 02, 2014 6:21 pm
Forum: Naming
Topic: Knowing whether the compound has net neutral charge or not
Replies: 7
Views: 917

### Knowing whether the compound has net neutral charge or not

For quiz 3 prep #4, you have to find the chemical formula for potassium tetracyanonickelate (II). I know that it should be K2[Ni(CN)4], but why? I know the following: (CN)4= (-1)x4=-4 Ni (II)=+2 Thus, the charge of the coordination compound is -2, and making potassium K2 instead of K neutralizes the...
Tue Dec 02, 2014 6:09 pm
Forum: Naming
Topic: How to write structural formula order?
Replies: 5
Views: 784

### Re: How to write structural formula order?

I also thought that you're supposed to write down the neutral ligands before the anionic ones.
Tue Dec 02, 2014 5:58 pm
Forum: Naming
Topic: Quiz 3 prep #4
Replies: 3
Views: 509

### Re: Quiz 3 prep #4

This may be a stupid thing to ask... but why is it K2 and not just K? Edit: I know know that the coordination compound has a charge of 2- and K2 neutralizes the whole compound. However, how are you supposed to know whether the whole compound is neutral or not? How would the formula indicate whether ...
Tue Dec 02, 2014 5:48 pm
Forum: Naming
Topic: Elements before the brackets
Replies: 4
Views: 629

### Re: Elements before the brackets

Can you post an example? I'm not exactly sure what you're talking about.
Tue Dec 02, 2014 5:45 pm
Forum: Naming
Topic: Naming Bis Tris Tetrakis
Replies: 4
Views: 826

### Re: Naming Bis Tris Tetrakis

Do you have to ever use bis-, tris-, etc? Or can you just use bi-, tri-, etc and still be correct?