# Tag Info

1 vote

• 34.1k

### Why is CrO3 an oxidising agent, but WO3 is not?

We can look at both ionization energy and coordination aspects. Both factors differentiate the relative stability of both $\ce{MoO3}$ and $\ce{WO3}$ from the strong oxidizing tendency of $\ce{CrO3}$. ...
• 46.8k

### How to prepare iron(II) carbonate from iron(III) chloride?

This is the simplest method I can think of: $\mathrm{2FeCl_3+Fe\rightarrow3FeCl_2}$ $\mathrm{FeCl_2+Na_2CO_3\rightarrow FeCO_3+2NaCl}$ It only uses iron metal and sodium carbonate, which are readily ...

### How to synthesize lanthanum(III) chloride & Cerium(III) chloride from their oxides?

Wikipedia mentions synthesis of $\ce{LaCl3}$ from $\ce{La2O3}$: Anhydrous lanthanum(III) chloride can be produced by the ammonium chloride route. In the first step, lanthanum oxide is heated with ...
• 24k

### Why doesn't oxygen form cyclic pentagonal compounds with itself?

Sulfur does form ring compounds, so why not oxygen? You're not wrong to wonder, but I think people are reacting to the implication that this species has: [no] weak bonds Consider hydrogen peroxide H-...
• 27.5k
Accepted

### Why is solubility affected by temperature?

Firstly that is strictly not true. Most solutes that are gaseous at the temperature will be less solvated the higher the temperature of the solvent liquid, for instance. There are other relevant ...
• 2,639

### Why Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) reaction really occurs?

Copper is attacked by molecular $\ce{HNO3}$, and neither by $\ce{H+}$ nor by $\ce{NO_3^-}$ ions. The equation is : $$\ce{3 Cu + 8 HNO3 -> 2 NO + 4 H2O + 3 Cu(NO3)2}$$ At high $\ce{HNO3}$ ...
• 25k

### Why Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) reaction really occurs?

It is true that Copper has a negative oxidation potential hence H+ ion is unable to oxidise $\ce{Cu(s)}$ to $\ce{Cu+}$ or $\ce{Cu}^{2+}$. It is the reason why Copper does not react with strong mineral ...

### Can a sulfur atom form six single bonds with six other sulfur atoms?

Answering the question posed in the title: yes, and under relatively mild conditions. A hexacoordinated sulfur is present as μ6-sulfido group $(\ce{S^2-})$ linking two $\ce{[Mo3S(S2)3]^4+}$ cores ...
• 36.9k

### Why are sulfites often ignored in soil studies?

I think Andrew is correct in his statement: I think it's generally assumed that sulfite has a short lifetime in soil, decomposing to $\ce{SO2}$ gas or getting oxidized to sulfate. Sulfur is found in ...

### Can a sulfur atom form six single bonds with six other sulfur atoms?

Under high pressure [a six-coordinate form of elemental sulfur is known 1. As one might expect, a higher pressure is required to achieve this phase with sulfur than with its heavier and more nearly ...
• 46.8k

### Does Isopropyl alcohol (isopropanol/rubbing alcohol) react with polyethylene terephthalate?

It does not. Gallon quantities of isopropyl alcohol typically ships in HDPE bottles which are less resistant to alcohols than PET. Chance of having a reaction between rubbing alcohol (which is 30% ...
• 94
Accepted

### Why are sulfites often ignored in soil studies?

This article(ref.) gives you your answer: While techniques are available for determining the concentration of most S-oxides in soil, determination of soil sulphite has been largely neglected. This is ...

### Hydrate forms causing complications with gravimetric analysis of ferric phosphate

As Poutnik suggested, you shouldn't use unestablished methods for gravimetric analysis for analytic determination. The Ref.1 have showed one of the original published method for phosphate analysis by ...

### Why does potassium bifluoride exist whereas bichloride does not?

The bichloride ion, including isolated salts, has in fact been known since 1954 [1]; but it appears to require relatively bulky counterions whereas bifluoride has a broader range of stable salts. To ...
• 46.8k
The bichloride ion $\ce{HCl2^-}$ does exist, but it requires other environment than usual solutions in water. E.g. solution of $\ce{[N(CH3)4]Cl}$ salt and undissociated $\ce{HCl(solv)}$ in ...