All Questions
16
questions
4
votes
1
answer
244
views
What results from the neutralization of copper citrate with Na2CO3
I found this question that describes PCB etching with citric acid. The answer to that question explains how hydrogen peroxide, salt, and citric acid can be used to ionize copper metal in water, which ...
- 165
2
votes
0
answers
31
views
About the acidity of Sultiame [closed]
Why is sulthiam base even hough sulfur can accept the electron by resonance from nitrogen
like carbonyl group do?
- 29
0
votes
0
answers
356
views
About the acidity of phenytoin
Can you explain why phenitoin is weak acid even though nitrogen is base?
Does carbonyl group always make structure acid?
If this structure doesn't have carbonyl group, would it be base not acid?
- 29
1
vote
1
answer
3k
views
What concentration is phenolphthalein indicator ? 1% or 0.1%
I read some information about phenolphthalein indicator, some websites suggested phenolphthalein indicator of 1%, others mentioned phenolphthalein indicator of 0.1%. What is the difference of both of ...
- 11
1
vote
1
answer
1k
views
The effects of acetic acid on porous concrete brick and mortar joints
I mistakenly applied a patio cleaner containing acetic acid to my porous concrete facing brick thinking it was biocide. The concentrate solution has a pH of 3 and I diluted it to one part concentrate ...
7
votes
1
answer
1k
views
Understanding sodium hydroxide drain cleaner's exothermic dissolution of aluminum; does the aluminum need to be oxidized before it dissolves?
I'm not a chemist but I remember that the standard HF/nitric silicon etch used in micro-fabrication supposedly worked in two steps; the HF would dissolve the thin SiO2 oxide layer on the silicon ...
- 5,900
18
votes
3
answers
6k
views
Why is it considered acid rain with pH <5.6?
I recently read in a book that rain is considered acid rain if the pH falls below 5.6. However a substance is acidic when the pH is below 7; so why is the boundary for acid rain 5.6?
I was thinking ...
- 748
2
votes
1
answer
297
views
Why is the pH level of carbonation loss decreasing then increases afterwards?
We have done an experiment of the titration of unsealed sprite soda to find the amount of carbonic acid being loss on various duration (0 to 1 hour), due to decrease pressure.
The calculation was to ...
- 21
-1
votes
1
answer
167
views
Quantity of base needed to neutralise litre of 36% HCl?
Sorry for asking a basic chemistry question. I last did this kind of chemistry at school about 30 years ago and I don't have confidence that I'd get it right from first principles :)
Short version: ...
- 419
4
votes
2
answers
2k
views
Maximum possible hypochlorite concentration from electrolysis?
For reference, "electrochlorination" is just the electrolysis of a simple solution of water and table salt (NaCl) followed by reintroducing the chlorine gas produced.
But, the Wikipedia article on "...
- 1,556
0
votes
2
answers
599
views
Predicting products of chemical equations? [duplicate]
Consider the equation $\ce{2 NaOH (aq) +Cl2 (g) —> NaOCl (aq) + NaCl (aq) + H2O (l)}$. How would one know the products of this reaction? Is there a general way of doing this? I would have no ...
- 11
3
votes
2
answers
23k
views
Why do vinegar and other acids remove rust?
I have started a project on restoring a very rusty knife. I had used vinegar to remove the rust. A question dawned on me: why does vinegar remove rust? So being the thoughtful person I am, I googled ...
- 75
11
votes
3
answers
31k
views
Why does the pH of soft drinks get lower as they go flat?
I am doing an investigation about the chemistry of soft drinks and as part of this I observed the effect of time on the pH of soft drinks fully expecting the pH to increase as the carbonic acid, a ...
- 111
5
votes
1
answer
503
views
Can acid mine drainage form acid rain?
Can acid mine drainage form acid rain?
Since normal acid rain is formed via combustion of fossil fuels, the sulphur dioxide and nitrogen dioxide are all in the gas phase, whereas in acid mines the ...
- 637
6
votes
2
answers
2k
views
Alternative PCB etching solutions - Is KMnO4 or NaClO suitable oxidizer?
I need to etch small PCB for my project, since I do this once in a blue moon I would like to try some easy approach, preferably with household items. I'm aiming at the use of acetic acid with hydrogen ...
- 163