All Questions
18
questions
-2
votes
1
answer
94
views
Creating Chloramines
I'm currently conducting some testing related to indoor pool environments.
Here I believe, airborne chloramines are responsible for stress corrosion cracking in austenitic stainless steels.
...
- 65
0
votes
1
answer
2k
views
How do you calculate percentage acidity?
I am looking to calculate the percentage acidity of different drinks for the purposes of devising cocktail recipes. According to Liquid Intelligence by David Arnold, the optimum acidity level is 0.7-0....
- 177
6
votes
2
answers
3k
views
Are acids effective in removing soap scum?
In my experience, most of the commercial products intended for removing soap scum from bathroom surfaces are ineffective. No matter how long you leave it on or how hard you scrub, the soap scum doesn'...
- 874
11
votes
1
answer
2k
views
Why measure both alkalinity and pH in pools if pH alone tells us how acidic or basic something is?
I am trying to better understand the chemistry of maintaining my pool so that I can use the least amount of chemicals to control algae growth and I'm confused by the need to measure both total ...
- 221
2
votes
0
answers
612
views
The pH of tap water changes with time [closed]
My following questions are related to $\mathrm{pH}$ values in irrigation water in plants.
I got a $\mathrm{pH}$ meter and I am measuring the tap water and I get an value about 8.
My first question: ...
- 31
2
votes
2
answers
2k
views
Why is HCl the acid of choice for swimming pools?
Why is muriatic acid the go to acid to put into pools? Does it work better than nitric acid, sulfuric acid, or another strong acid? I mean they all will add the same amount of H+ right? Note, we use ...
- 1,167
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
13
votes
2
answers
9k
views
Why are synthetic pH indicators used over natural indicators?
Synthetic indicators seem to be exclusively used when determining the pH of a substance with an indicator (with the exception of that school experiment where you boil cabbage to demonstrate natural pH ...
- 143
2
votes
1
answer
2k
views
Why was my soap measured as acidic?
I've always been told soap is basic in pH. A few years back in a high school chemistry class, we measured the pH of various substances with universal pH indicator. We measured some liquid hand soap ...
- 1,167
8
votes
1
answer
6k
views
Why does gaseous HCl not change dry blue litmus paper to red?
I am doing a practical in lab, in which HCl is to be evolved. I found that when blue litmus is near the evolved gas, it doesn't turn red. But, when litmus is dipped in water and then brought near the ...
5
votes
1
answer
82
views
Help with idea for an optical pH sensor
I am experimenting at home with the idea of making an optical pH sensor that can read the colour of pH indicator using photodiodes.
I am wondering if there is some kind of ion permeable membrane that ...
- 151
6
votes
4
answers
11k
views
How is seawater alkaline?
If when water and carbon dioxide react they form carbonic acid, carbonate, and bicarbonate, how does seawater still have a pH of around 8? Doesn't a compound need an hydroxide ion to be a base?
- 165
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
0
votes
1
answer
1k
views
pH of bleach solution slowly decreasing?
I work within a science department in a school. We are demonstrating Universal Indicator and something odd has happened. Our bleach solution (~2.5% Sodium hypochlorite) turns blue when UI is added but ...
- 1
3
votes
2
answers
35k
views
What ratio of bicarb to vinegar do I need in order for the result to be pH neutral?
This question stems from one I just asked over at Seasoned Advice, where my recipe tasted decidedly off because the pH was wrong.
The recipe called for $\pu{16 g}$ bicarb of soda (sodium bicarbonate, $...
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