All Questions
11
questions
2
votes
0
answers
40
views
Is the amine nitrogen of methylglycinediacetic acid (MGDA) protonated?
MGDA is a tertiary amine with 3 acetic acid groups. I would like to know whether the amine Nitrogen of MGDA is protonated or not for a given pH value. I could not find any literature data which ...
- 29
-1
votes
1
answer
107
views
Between compounds having same functional groups, why does the one with greater -I effect have higher acidic strength
Consider the two compounds $\ce{FCH2COOH}$ and $\ce{ClCH2COOH}$.
Since fluorine is more electronegative than $\ce{Cl}$ it will show a greater –I effect.
It will pull the the electrons closer towards ...
- 21
1
vote
1
answer
70
views
An Index Poisoning Case Involving Dichlor and Carbonic Acid [closed]
I'm currently working an unusual case of poisoning, with Sodium Dichloro-S-Triazinetrione.
In my case, I need to know the expected reaction with carbonic acid.
I'm also curious if anyone could give ...
- 11
1
vote
1
answer
393
views
Why does the pH of a weak acid not increase by 1 when diluted by a factor of 10? [closed]
Strong acid pH increases by one unit when diluted by a factor of 10, but why do weak acids not?
- 23
4
votes
1
answer
906
views
How does monoethanolamine (MEA) increase pH?
I know pH of a solution increases with increase concentration of $\ce{OH-}$.
I'm wondering: when adding MEA, is the $\ce{OH-}$ group from the MEA breaking off, or is it the whole MEA molecule taking ...
- 41
6
votes
2
answers
1k
views
Why do most carboxylic acids have high pKa (~5) in spite of having a conjugate base ion that is stabilized by resonance?
This is from my textbook:
Carboxylic acids owe their acidity ($\mathrm pK_\mathrm a$ of about $5$) to the resonance-stabilized carboxylate anions formed by deprotonation.
Why are they such weak ...
- 709
8
votes
2
answers
10k
views
Why is ortho-hydroxybenzoic acid more acidic than its para-isomer?
Why is ortho-hydroxybenzoic acid $(\mathrm{p}K_\mathrm{a} = 2.98)$ more acidic than its para-isomer $(\mathrm{p}K_\mathrm{a} = 4.58)$?
March's Advanced Organic Chemistry (7th ed) gives the reason to ...
- 5,501
6
votes
2
answers
1k
views
Balancing complex haloform redox reaction
I just completed a haloform reaction experiment, using acetophenone and sodium hypochlorite to form benzoic acid and chloroform.
My lab report has a question regarding balancing the equation of the ...
- 61
10
votes
1
answer
266
views
Obtaining activity coefficients of conjugate acids of some common carboxylic acid molecules
Recently, I have been wondering about justifying the notion on how some common acids (e.g. carboxylic acids) are themselves weaker bases than water to the point that we don't usually consider them to ...
- 698
6
votes
4
answers
46k
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How to rationalise that when we dilute a weak acid, the pH increases but also the dissociation increases?
When water is added to a weak acid like ethanoic acid, the number of ethanoic acid molecules that dissociate increases, however, pH increases (less acidic), too. Why is this so?
- 2,423
9
votes
1
answer
1k
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Proton transfer equilibrium in bisulphite adducts
In the addition of $\ce{NaHSO3}$ to aldehydes and methyl ketones (higher ketones do not respond well to this reaction), crystalline addition products are formed. An $\ce{-SO3H}$ and an $\ce{-OH}$ ...
- 6,795