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Results tagged with acid-base
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user 418
This tag should be applied to questions concerning acid and base reactions. An acid is capable of donating a hydron/ proton (Brønsted acid) or capable of forming a covalent bond with an electron pair (Lewis acid). A base on the other hand is a chemical species/ molecular entity having an available pair of electrons capable of forming a covalent bond with a hydron/ proton (Brønsted base) or with the vacant orbital of some other species (Lewis base).
2
votes
Sodium thiosulfate and Hydrochloric acid
There's a nice demonstration of the experiment performed by Annis Hapkiewicz.
She uses a 0.15 M $\ce{Na2S2O3}$ stock solution. She prepares 5 beakers with 50 40, 30, 20 and 10 mL of the stock solutio …
- 30k
2
votes
Accepted
How do I write out the chemical reaction of ammonia with strong acid?
In the second part, for example, $\ce{Zn}$ is 2+ and $\ce{H}$ is -1. So using the criss-cross method, you get $\ce{Zn(NO3)2}$ and water. I understand this.
I don't agree on the -1 for hydrogen, l …
- 9,910
1
vote
How to rationalise the drop in pH when excess aluminium nitrate is added into an aqueous amm...
As andselisk has already pointed out in a comment, the hexaquo complex of aluminium is a known "cation acid"
$$\ce{[Al(H2O)6]^{3+} + H2O<=> [Al(H2O)5(OH^-)]^{2+} +H3O+}$$
A practical application is t …
- 44.2k
5
votes
Chemical compounds responsible for the colors in flowers?
Janice, apart from the benzopyrylium (anthocyane) dyes you mentioned, there's quite some red to be found among the natural hydroxy-substituted naphthoquinones and anthraquinones, e.g.
Purpurin [81-5 …
- 4,635
4
votes
Possible ammonia anomaly?
Is this an anomaly of ammonia, or is there something fundamentally wrong about my equations?
Fundamentally wrong would be a bit harsh ;)
But notice that the reaction
$$\ce{HCl + NaOH -> NaCl + …
- 24.1k
21
votes
Accepted
Do acids really donate a proton?
Yes, according to the Arrhenius theory, acids dissociate in aqueous solution and release a proton ($\ce{H+}$). The Brønsted–Lowry defines acids ($\ce{HA}$) and bases ($\ce{B}$) in such a way that the …
- 44.2k
2
votes
Separation techniques for different organic compounds
You have correctly identified the carboxylic acid in pair 1. The second conpound is 9-chloroanthracene. Calling it a chlorodiene isn't correct. It's an aromatic compound. Anyway, your conclusion to us …
- 44.2k
1
vote
Treatment of acid attack by milk
"Treatment" of acid burns by pouring milk over it falls into the same category as
drinking milk in the case of intoxications
covering burns with flour or shaving cream
All these "household remedi …
- 44.2k
7
votes
How to arrange carboxylic acids (phenylacetic acid and acetic acid) by increasing acidity?
The $\mathrm pK_\mathrm a$ difference between phenylacetic acid and acetic acid is around 0.5 and the trends become more obvious when other arylalkanoic acids are included in the comparison. Numbers i …
CommunityBot
- 1
1
vote
Accepted
Are there any acid-base indicators whose protonated and deprotonated forms have the same num...
In contrast to 4-nitrophenol, cresol red, bromocresol green, and bromophenol undergo structural changes upon deportonation because the sultone opens up.
But again, you can draw quinoid resonance stru …
- 44.2k
3
votes
Can the colour change in litmus paper be explained by conjugated systems?
You have shown the structural change in bromothymol blue upon deprotonation.
For the anion of 7-hydroxyphenoxazone, the following resonance structures involving a p-quinone imine are conceivable …
- 44.2k
2
votes
Reaction of 1,1-diphenylethanol on Montmorillonite K10 under microwave radiation
Is my answer correct?
No! Your "answer" is just a random collection of facts and does not address the question.
Actually, Ben Norris has already kindly provided all the necessary information in …
- 44.2k
4
votes
What is the word for how polyprotic an acid is?
Proticity does sound nice, but it is a bad choice since the term has already been introduced by Peter D. Mitchell (1978 Nobel Prize in Chemistry) in a completely different context.
In his Nobel Lectu …
- 44.2k
1
vote
Chemical Equillibria Comparisons
You have already ruled out the equations b, c, and e.
But I'm not sure how to compare the remaining two reactions.
Have a look at equation a again.
The reaction of $\ce{P4O10}$ with water gener …
- 44.2k
13
votes
Why isn't dry CaCl₂ used to dry HCl gas instead of concentrated sulfuric acid?
There are several reasons:
Efficiency
When a stream of wet hydrogen chloride is run through a tube filled with coarse calcium chloride "rocks", interaction with the drying agent takes place at at it …
- 44.2k