Reaction between water and chromium metal

AI Thread Summary
The reaction between chromium metal and water under acidic conditions produces chromium ions and hydroxide ions, represented as Cr + 3H2O → Cr(OH)3 + 3e- + 3H+. In basic conditions, chromium hydroxide (Cr(OH)3) forms, with hydroxide ions (OH-) as reactants. The discussion highlights that chromium is often passivated by oxides, complicating its reactions with water. This passivation means that the expected reactions may not occur as straightforwardly as predicted. Understanding these conditions is crucial for accurately predicting chromium's behavior in different environments.
izen
Messages
50
Reaction score
0
Hi there,

How to write the reaction between water and chromium metal under standard (i) acid and (ii) base condition?



Cr + 3H2O ----> Cr(OH)3 + 3e- + 3 H+ (acid condition)

basic solution ?


Please help
 
Physics news on Phys.org
In acid I would start with Cr and H+, yielding Cr3+.

Cr(OH)3 is a correct product for alkaline solution, and I would assume OH- to be one of the reactants.

In reality Cr is passivated by oxides, so its reactions are not that simple.
 
thanks
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
View full post »

Thread 'Prove that evolution is constant (Provide at least two arguments to support your position)'

I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
View full post »

Similar threads

Chemistry How to take into account autoprotolysis in weak base solution?
Replies
8
Views
2K
Chemistry Understanding how to calculate pH of a buffer solution
Replies
2
Views
1K
Chemistry How to calculate pH at equivalence point using this alternative?
Replies
7
Views
1K
Chemistry How do we interpret the steps in the algorithm to balance a redox equation?
Replies
7
Views
2K
Determining Solubility in Acidic Solutions / Pure Water
Replies
3
Views
3K
Chemistry: dissolving aluminum metal in hydrochloric acid
Replies
6
Views
4K
Chemistry How to find the pH of a galvanic cell (MIT OCW problem set)
Replies
2
Views
3K
Writing out chemical equations
Replies
2
Views
4K
Chemical Equilibrium and Le Chatelier's Principle
Replies
20
Views
4K
How to get the balanced redox equation in this sample problem?
Replies
8
Views
3K

Hot Threads

Recent Insights

Back
Top