Destroyer G chem #87

[Jaylee777]

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Question asks which ionic solid gave a blue color.

Answer states CuSO4 because transition metals give color. AgCl is another answer choice.

Why is Ag not considered a transition metal? Looking at my textbook periodic table, all elements in the d orbital section are transition metals right?

also #66

answer states that only temperature changes Kw, Ka, Kb, Ksp, Keq. Wont changing the concentration change the K value...for example- changing the pH changes the concentration of H+ and therefore changes Ka since Ka= conc of products over conc of reactants? am I wrong? Please help me understand.

Thanks in advance

 

[Jaylee777]

bump

a little help here pls....

 

[Archie376]

Just like anything else you encounter, their are exceptions to the rule. The reason trans. metals give color is because they have multiple oxidation states. I believe this equates to their valence electrons ability to move about freely compared to group A elements. Ag has only one oxidation state of +1, while Zn has only +2.

 

[marianirj]

Question asks which ionic solid gave a blue color.

Answer states CuSO4 because transition metals give color. AgCl is another answer choice.

Why is Ag not considered a transition metal? Looking at my textbook periodic table, all elements in the d orbital section are transition metals right?

also #66

answer states that only temperature changes Kw, Ka, Kb, Ksp, Keq. Wont changing the concentration change the K value...for example- changing the pH changes the concentration of H+ and therefore changes Ka since Ka= conc of products over conc of reactants? am I wrong? Please help me understand.

Thanks in advance

For the 2nd question, I believe that changing the concentration of a substrate will in turn change the concentration of the product. This will allow the Keq to stay constant. The whole point of a Keq is to allow you to calaculate concentrations if you are given either the product or the subrate's concentration.

 

[marianirj]

Question asks which ionic solid gave a blue color.

Answer states CuSO4 because transition metals give color. AgCl is another answer choice.

Why is Ag not considered a transition metal? Looking at my textbook periodic table, all elements in the d orbital section are transition metals right?

also #66

answer states that only temperature changes Kw, Ka, Kb, Ksp, Keq. Wont changing the concentration change the K value...for example- changing the pH changes the concentration of H+ and therefore changes Ka since Ka= conc of products over conc of reactants? am I wrong? Please help me understand.

Thanks in advance

Dr. Romano and I discussed your question about silver not having color. We came to the conclusion that in order to have color, there has to be a d orbital vacancy so that electronic transition can occur. Copper is an s1d10, and therefore has no vacancy in it's d orbital.

Hope this helps.

 

[Archie376]

for your second question,


I think the whole thing with K values is that they are constant. you are mixing them up with the RATE. K values are dependent and are different based on what is dissociating. They are based on a specific amount of a particular compound in a certain amount of solvent. (think of it as a ratio). What changes is the rate depending on how much you add. The RATE just tells you a numerical value, its not constant. Only temp changes ksp because a specific amount of solvent can now hold more dissociated product than it did before heat.

Ka values are the same thing except they are for acid dissociation.

Any other input anyone?

 

[Jaylee777]

thanks for the explanations and clarifications!