All Questions
16
questions
0
votes
0
answers
516
views
Nature of Bisphosphonates Binding onto Hydroxyapatite in the Aqueous Phase
In many studies I've read, bisphosphonates (first image) are said to bind remarkably onto bone hydroxyapatite (second image) crystals. It was reported by J. Roelofs et al., (2008) that this mechanism ...
- 467
-1
votes
1
answer
151
views
Do coordination complexes with stronger ligands form more stable complexes?
I read that chelate complexes generally are more stable than monodentate complexes. However, I noticed that in the case of $\ce{[Fe(CN)6]^3-}$ and $\ce{[Fe(en)3]^3+}$, this is not observed as the ...
- 173
0
votes
0
answers
74
views
Equilibrium of zinc ion with ammonia
In my chemistry lab, we are testing the amphoteric properties of this metal. I understand zink can react with an acid or a base to form different compounds in solution based on pH. In one part of the ...
- 1
4
votes
1
answer
226
views
Why is hydrated beryllium ion acidic?
The beryllium ion, $\ce{Be^{2+}}$, forms the aquo complex $\ce{[Be(H2O)4]^{2+}}$. According to LibreTexts, this complex is acidic in solution: $$\ce{[Be(H2O)4]^{2+} + H2O -> [Be(H2O)3OH]+ + H3O+}$$
...
- 750
2
votes
2
answers
417
views
Do all metal salts in aqueous solution contain metal aquo complexes?
I know that nickel nitrate in aqueous solution contains the metal aquo complex ion $\ce{[Ni(H2O)6]^2+}$. But do all metal salts in aqueous solution contain such complex ions? If not, on what factors ...
- 139
2
votes
1
answer
105
views
Can o-phenanthroline be used as a complexing agent for lead(II)?
I’ve been trying to find a method to perform a spectrophotometric analysis to determine lead concentration (on the ppm level). This would require some chelator capable of forming a coloured complex ...
- 467
2
votes
1
answer
295
views
Formation of green precipitation whilst adding potassium fluoride to aqueous solution of copper(II) sulfate [closed]
Aqueous copper sulfate solution (blue) gives a green precipitation with aqueous potassium fluoride. Explain these experimental results.
I've read answers like, $\ce{H2O}$ is a weak ligand and ...
- 21
1
vote
1
answer
3k
views
Products of the reaction between chromium(III) chloride, zinc and sulfuric acid
The aim of my experiment was to make a Cr(II) aquacomplex in situ, and for that I have the reaction:
$$\ce{CrCl3·6H2O + Zn}$$
and I add concentrated sulfuric acid to it. I know that chromium(III) ...
- 748
4
votes
2
answers
2k
views
Is Fe(OH)2 soluble in alkalis?
I have just started inorganic chemistry in school and I have just learnt about metal aqua ions and how they react in water. I learnt that $\ce{[Fe(H2O)6]^2+}$ reacts in water by losing a $\ce{H+}$ ...
- 95
3
votes
1
answer
5k
views
Why are different colors, according to sugar concentration observed in Benedict's test?
Colors range from green yellow orange to red. How does the sugar concentration and Cu2O concentration cause this?
I know Cu2O is red. Why is there a green or yellow color instead of just red or some ...
- 33
5
votes
1
answer
999
views
Formation of MnO2 vs [Mn(H2O)6]4+ in aqueous solution
I am looking for reasons why $\ce{Mn(IV)}$ wouldn't be stable as a hydrate. I know that from standard reduction potentials it exists as a ppt of $\ce{MnO2}$, but what is stopping it from being a ...
- 1,120
1
vote
1
answer
454
views
Why does tetrachlorocuprate(II) form in aqueous solution even though water should be the stronger ligand? [closed]
In aqueous solution, $\ce{Cu^{2+}}$ forms the $\ce{[Cu(H2O)6]^2+}$ complex. Given that water is a stronger ligand than $\ce{Cl-}$, though, why does why does the $\ce{[CuCl4]^2-}$ complex form upon ...
- 462
7
votes
1
answer
6k
views
Reaction between alumina and aqueous sodium hydroxide, which one's right?
My chemistry textbook has a rather annoying irregularity.
It cites two different reactions for the same set of reactants (aluminium oxide, sodium hydroxide and water) without the slightest mention of ...
- 18.8k
12
votes
2
answers
626
views
Water exchange at Al (III)
Why is the rate of water exchange at Al(III) centres so slow ?
According to this medical book (p.5) it is $10^{5}$ times faster at Mg(II).
- 2,590
0
votes
1
answer
558
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Zinc Picolinate - Positive, negative or neutral charge?
I'm going to be using a finings agent with a positive charge to remove negative trub from a solution (beer).
I would like to keep some chelated zinc in the solution - ideally zinc picolinate - so ...
