vera_ewing
  • vera_ewing
3 of 15 Which of the following statements is true regarding the dissolution of a salt in a solvent? A. An equilibrium constant can be described that is the product of the concentrations of the ions to the power of their coefficient. B. The reaction does not have an equilibrium constant since all dissolution reactions are nonreversible. C. Precipitates are included in the equilibrium constant. D. The number of each ion does not affect the equilibrium constant.
Chemistry
chestercat
  • chestercat
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vera_ewing
  • vera_ewing
anonymous
  • anonymous
it's b
sweetburger
  • sweetburger
It is not b.

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anonymous
  • anonymous
oops
sweetburger
  • sweetburger
All dissociation reactions will have Equilibrium constants in the form of Ksp values.
sweetburger
  • sweetburger
Besides that I believe the correct answer would be A. As B,C, and D are all incorrect. And A does make sense mathematically.
vera_ewing
  • vera_ewing
Thank you. This one?
sweetburger
  • sweetburger
Products over reactants and H2O is a liquid so it drops out
sweetburger
  • sweetburger
Hmm these answers seem off.
sweetburger
  • sweetburger
I'm almost completely sure it should be [H3O+][CH3COO-]/[CH3COOH]
sweetburger
  • sweetburger
Oh its C. I completely missed it XD.
anonymous
  • anonymous
I think the answer is B, because the Kc expression must apply for aqueous substances only and H2O is liquid. Solids and liquids should be out.
vera_ewing
  • vera_ewing
Thank you it was C. ________equilibrium is a type of ________equilibrium which occurs when a reaction is ________. A. Dynamic; chemical; irreversible B. Dynamic; chemical; reversible C. Chemical; dynamic; irreversible D. Chemical; dynamic; reversible
anonymous
  • anonymous
I mean C.
sweetburger
  • sweetburger
It cannot be A or C. A dynamic equilibrium will always be reversible.
rvc
  • rvc
B
sweetburger
  • sweetburger
Im almost sure it should be D. As a chemical equilibrium would fall under the classification of a dynamic equilibirum.
rvc
  • rvc
lol D
rvc
  • rvc
sorry im multitasking
vera_ewing
  • vera_ewing
Yep, thanks it was D. This one?
rvc
  • rvc
C?
sweetburger
  • sweetburger
C looks good.
vera_ewing
  • vera_ewing
Which of the following choices is not a potential application of the solubility product constant? A. Determine reactant concentrations that will allow a precipitate to form. B. Determine ion concentrations that will prevent a precipitate from forming. C. Determine ion concentrations that will allow a precipitate to form. D. Use Ksp to find solubility.
sweetburger
  • sweetburger
Well you can use Ksp to find solubility so it cant be D.
sweetburger
  • sweetburger
I'm actually not to sure on this one. I'm trying to think through it, but not much is coming up.
sweetburger
  • sweetburger
Actually it cannot be C either as you can determine how much of a ion will cause a precipitate to form.
vera_ewing
  • vera_ewing
So it's either A or B?
sweetburger
  • sweetburger
Ya, I think so.
vera_ewing
  • vera_ewing
Which one is the most logical answer?
sweetburger
  • sweetburger
I'm leaning towards A after thinking through it, but I'm still not completely sure with this question.
vera_ewing
  • vera_ewing
It was A! :)
sweetburger
  • sweetburger
Haha, nice. :)
vera_ewing
  • vera_ewing
sweetburger
  • sweetburger
I think this is just a Ksp problem in disguise, but Im not completely sure. So im going to say that 1.5x10^-8=[x][x] and then take the square root of both sides and get that x=.000122. That is equivalent to saying that [Pb2+]=1.22x10^-4.
vera_ewing
  • vera_ewing
Thank you! The solubility of a substance is the _____ amount of the substance that can dissolve to form a _____ in a given amount of a particular solvent at a specified temperature. A. minimum; solution B. minimum; precipitate C. maximum; precipitate D. maximum; stable solution
sweetburger
  • sweetburger
maximum amount to form a stable solution
vera_ewing
  • vera_ewing
thanks. how about this one?
sweetburger
  • sweetburger
No matter how insoluble we say a substance is something will always dissolve this even holds true for nonpolar substances being dissolved in polar substances and vice-versa. In this case the determined value of Ksp is so extremely small that we qualify it as insoluble.
sweetburger
  • sweetburger
So C.
vera_ewing
  • vera_ewing
What is the solubility product constant (Ksp)? A. The equilibrium constant for the formation of any ionic compound B. The equilibrium constant for the formation of a nearly insoluble ionic compound C. The equilibrium constant for the dissolution of any ionic compound D. The equilibrium constant for the dissolution of a nearly insoluble ionic compound
sweetburger
  • sweetburger
C.
vera_ewing
  • vera_ewing
It was D.
vera_ewing
  • vera_ewing
vera_ewing
  • vera_ewing
@sweetburger How about this one?
sweetburger
  • sweetburger
B. As CaCO4 Ksp is 2.4x10^-5 and PbSO4 Ksp is 1.7x10^-8 adn CaCO4 has the larger Ksp value meaning it will be more soluble.
vera_ewing
  • vera_ewing
Thank you.
vera_ewing
  • vera_ewing
Not so sure about this one. A or B maybe?
sweetburger
  • sweetburger
Yes, I believe it would be. Think about it like this the Keq value is Products/Reactants if there are more reactants than prodcuts and I am just using arbitrary number here you will see that 1/100 = .01 which is a much smaller value then for example 100/1= 100 if there were more products than reactants . So when there are far more reactants at equilbirum the Keq value will be far less than 1. So B should be the correct answer. As for this example the Keq values is 1x10^-3 which is far smaller than 1.
vera_ewing
  • vera_ewing
So A or B?
sweetburger
  • sweetburger
Im pretty sure B.
vera_ewing
  • vera_ewing
What does a dissolved salt look like? A. The salt crystals are surrounded by water molecules. B. The salt crystals separate into salt molecules in the water. C. The ions in the salt are surrounded by water molecules. D. The salt separates into ions that settle to the bottom.
sweetburger
  • sweetburger
This should be C. as the positive ions will be surrounded by polar negative Oxygens from H2O molecules and the negative ions will be surrounded by polar positive Hydrogens from the H2O molecules.
vera_ewing
  • vera_ewing
Question 15 of 15 What is solubility a measure of? A. The energy needed for the solute to dissolve B. The amount of solute that will dissolve C. The type of solute that will dissolve D. The rate at which the solute will dissolve
vera_ewing
  • vera_ewing
anonymous
  • anonymous
D.
rvc
  • rvc
D
vera_ewing
  • vera_ewing
Ah it was B. Thanks though.
sweetburger
  • sweetburger
Yea Ksp has nothing to do with Kinetics
vera_ewing
  • vera_ewing
Thank you all so much for your help! I'm very thankful that you all helped me today! :) @Hoslos :) @rvc :) @sweetburger :)
sweetburger
  • sweetburger
Np :) @vera_ewing sorry I wasnt here for the last question :/
vera_ewing
  • vera_ewing
No worries :)
rvc
  • rvc
All the best @Hoslos @sweetburger thanks 4 helping me to help her
sweetburger
  • sweetburger
:)
anonymous
  • anonymous
I am glad. It was a good team discussion here though.
sweetburger
  • sweetburger
Agreed @Hoslos . Well done to everybody :).

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