Linked Questions

1 vote
1 answer
2k views

Why is Cu(II) more stable than Cu(I)? [duplicate]

Seeing Copper has an exceptional electron filling in its valence shell(4s1 3d10), the way I see it is that on +1, a d10 configuration should be more stable and hence easier to attain than a d9 which ...
Saumya Chaturvedi's user avatar
0 votes
1 answer
256 views

The stability of the cupric and cuprous ions [duplicate]

My teacher told me that $\ce{Cu^2+}$ is more stable than $\ce{Cu+}$ in solution, but why? I think $\ce{Cu+}$ is $\ce{[Ar] 3d^10 }$ ,$\ce{Cu^2+}$ is $\ce{[Ar] 3d^9}$, why is $\ce{Cu^2+}$ more stable ...
user6006786's user avatar
-1 votes
1 answer
107 views

Cupric and cuprous copper [duplicate]

Copper has two chlorides: $\ce{CuCl2}$ and $\ce{CuCl}.$ Copper reacts directly with chlorine to form a copper(II) chloride. Why doesn't it form copper(I) chloride? Is it because $\ce{CuCl2}$ is more ...
user701020's user avatar
7 votes
3 answers
2k views

Why do diluted sulfuric acid and hydrogen peroxide etch copper only when chloride ions are present?

I've mixed 30 ml 10% sulfuric acid with 20 ml 3% hydrogen peroxide and put a drop of this solution onto copper foil. The solution quickly removed the oxide layer from the copper but did not dissolve ...
Jonathan S.'s user avatar
9 votes
2 answers
9k views

Colour intensity of transition metal complexes

Even though they are both $\mathrm{d^7}$ complexes, the colour of $\ce{[Co(H2O)6]^2+}$ is pale whereas that of $\ce{[CoCl4]^2-}$ is more intense. Does the octahedral or tetrahedral geometry matter in ...
Subhadip Pal's user avatar
12 votes
1 answer
29k views

What happens when potassium iodide is added to a copper (II) salt?

$$\ce{Cu^2+ + KI -> ??}$$ I thought of this reaction: $$\ce{Cu^2+ + 2KI -> CuI2 + 2K+}$$ But since $\ce{CuI2}$ doesn't exist, the $\ce{I-}$ ions must reduce $\ce{Cu^2+}$ to $\ce{CuI}$ and ...
Nilay Ghosh's user avatar
  • 26.3k
6 votes
2 answers
828 views

Stability of 3d metal fluorides and iodides in different oxidation states

I read that the fluorides of 3d metals in lower oxidation states, e.g. $\ce{VF2}$, $\ce{TiF2}$, and $\ce{CuF}$ are thermodynamically unstable. For example, $\ce{CuF}$ disproportionates to $\ce{Cu + ...
user68418's user avatar
2 votes
1 answer
2k views

Why do Cu⁺ ions spontaneously form copper metal and Cu²⁺ ions in solution?

The standard electrode potentials for three reactions involving copper and copper ions are: $$ \begin{align} \ce{Cu^2+(aq) + e- &-> Cu+(aq)} &\quad E^\circ &= \pu{+0.15 V} \\ \ce{Cu^2+(...
Mayuri Vaish's user avatar
0 votes
1 answer
951 views

How do you determine the charge of the metal ion in a single replacement reaction? [closed]

Say we have a simple single replacement reaction between a salt and a metal $$\ce{2 AgNO3 + Cu -> Cu(NO3)2 + 2 Ag}$$ We know in normal circumstances, silver always has a $+1$ charge, and in normal ...
Max0815's user avatar
  • 323
0 votes
1 answer
207 views

stability of Cu(II), Cu(I) and Zn(II) ion

I would like to ask about the stability of $\ce{Cu^{2+}}$ and $\ce{Cu^{+}}$ and also $\ce{Cu^{2+}}$. $\ce{Cu^{2+}}$ has a configuration of $(3\mathrm{d})^9$ but $\ce{Cu^{+}}$ has a configuration of $(...
some one's user avatar