20 votes
Accepted

How long would it take for sucrose to undergo hydrolysis in boiling water?

This is a nice well-defined question, and luckily there is excellent data for which we can provide a quantitative answer. Richard Wolfenden's research group has sought for many years to characterize ...
Curt F.'s user avatar
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18 votes
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Mechanism for basic hydrolysis of α-chloronitrile to ketone?

Your analysis is slightly incorrect, actually. If you do a $\mathrm{S_N2}$ on the chloride, hydrolyse the nitrile, and decarboxylate, you end up with the wrong oxidation state: Instead, if you ...
orthocresol's user avatar
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11 votes
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Unusual hydrolysis of methyl 2,4,6‐trimethylbenzoate

In the typical reaction of hydroxide ion with a methyl ester, the hydroxide attacks the carbonyl carbon of the ester, resulting ultimately in elimination of methoxide. Given the basic conditions, the ...
Andrew's user avatar
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10 votes

Is magnesium sulfate basic, neutral or acidic?

Looking at the following references, it seems that most agree that a water solution of $\ce{MgSO4}$ is slightly acidic. "The pH of an aqueous magnesium sulfate solution is related to the molarity of ...
DrMoishe Pippik's user avatar
9 votes

Why does dissolving a salt in water get a high pH?

It's a little more complicated than that.. When you dissolved $\ce{Na2CO3}$ in water you had a solution of ions: $\ce{Na+}$, $\ce{CO3^2-}$, $\ce{H3O+}$ and $\ce{OH-}$ (the later are present in water ...
IanC's user avatar
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9 votes
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n-Factor of P4O6

As M. Farooq pointed in the comments, the concept of $n$-factor is applied to the reactions a given compound participates in, namely of the following types: acid-base, neutralization (in a context of ...
andselisk's user avatar
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8 votes

Aspirin Hydrolysis at pH 2

To understand the pH rate profile of the Aspirin hydrolysis, we have to look at all the possible mechanisms through which the hydrolysis may take place. A good rule of thumb for interpreting a pH rate ...
S R Maiti's user avatar
  • 5,675
7 votes

Is magnesium sulfate basic, neutral or acidic?

Aqueous solution of magnesium sulfate is going to be slightly acidic, and there is no need to even go to the lab to test it. $\ce{MgSO4}$ is a salt formed by a weak base and a strong acid (both ...
andselisk's user avatar
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7 votes
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Is (high) pressure required to form (quartz) crystals?

Pressure does not affect the crystal structure (unless it gets insanely great, so that stishovite formation kicks in; that's not going to happen in an autoclave, though). Pressure, however, does ...
Ivan Neretin's user avatar
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7 votes
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Which side of the C-O-C bond breaks in esters during hydrolysis in basic medium?

To answer this,Think about how an ester is formed. In the formation of an ester, wherin you react an alcohol with an acid in presence of conc.$\ce{H2SO4}$ $\ce{RCOOH + R'OH -> RCOOR' + H2O}$ Now ...
SubZero's user avatar
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7 votes
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Reasons for solid or liquid soap

I don't know if anyone is still looking for the answer but here I go anyway because I spent 40 minutes researching this for an assignment TL;DR - The better solubility of potassium salts is the key ...
D Arora's user avatar
  • 86
7 votes

On the stabler tautomer in amide-imidic acid tautomerism

The relative stability of the two tautomers (two isomers differing how protons are bound) may be assessed from the equilibrium constant you may formulate for the two. Deriving from above illustration,...
Buttonwood's user avatar
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6 votes
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Comparing the Lewis acidity of carbon tetrafluoride and silicon tetrafluoride

Both molecules can theoretically act as a Lewis acid. This would involve the approach of a Lewis base (i.e. a lone pair-carrying group), its interaction with the central atom and the formation of a ...
Jan's user avatar
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6 votes
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Hydrolysing a compound by repeated methyl and hydride shifts

The reaction will stop after first methyl rearrangement as it leads to tertiary allylic carbocation which is highly stable, so there will be no further rearrangement, as it does not lead to more ...
aks0854's user avatar
  • 190
6 votes

How to remove sulfuric acid from sample

Sulfuric acid is an excellent dessicant and is also very non-volatile itself (it boils at 337 °C). In other words it would likely still have been there in yet another month. Your instructor ...
airhuff's user avatar
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6 votes
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Are all hydrolysis reactions non-redox reactions?

Hydrolysis refers to any compound reacting with water, including cases where the water acts as an oxidizing or reducing agent. Magnesium silicide, for instance, reduces water leaving both hydrogen ...
Oscar Lanzi's user avatar
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6 votes
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Why is it advised to use neutral ferric chloride solution while performing confirmatory test for acetate ions?

Theory guides and experiment decides (I. M. Kolthoff). Sometimes thermodynamics predicts a reaction but it does not occur very fast because its kinetics is slow. If you dissolve iron (III) chloride in ...
AChem's user avatar
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5 votes

Rates of hydrolysis in bicyclic and monocyclic compounds

I’m going to shamelessly steal electronpusher’s drawing for clarification: Two general hydrolysis mechanisms are possible: $\mathrm{S_N2}$ and $\mathrm{S_N1}$. First, let us consider $\mathrm{S_N2}$ ...
Jan's user avatar
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5 votes

Why is HCl used in hydrolysis of sucrose?

The mechanism really isn't much more complicated than what you describe. The $\ce{H+}$ binds to the acetal linkage. Water then binds to the fructose ring, breaking its bond with the acetal linking $\...
Tyberius's user avatar
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5 votes
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Acetone absorbing water from the air

For Acetone or IPA we are more than happy to keep it in normal squeeze bottles which are not air tight so the bottle you've got should be fine. I believe you're more likely to see it evaporate first ...
IT Tsoi's user avatar
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5 votes
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Why does sodium react with water to produce a hydroxide, while zinc produces an oxide?

The overall potential of an electrochemical cell is equal to the reduction potential for the substance being reduced plus the oxidation potential for the substance being oxidized. In other words, $ΔE_{...
Niels Kornerup's user avatar
5 votes

Mechanism for hydrolysis of enol ether to aldehyde

Your issue is hardly with the Wittig reaction, although one could very well nitpick. The addition of phosphonium ylid to carbonyl is generally thought to be concerted: see Which is the currently ...
orthocresol's user avatar
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5 votes
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Hydrolysis of β-1,2 glycosidic bond

There are non-enzymatic methods for removing the three glucose moieties of stevioside 1. Unfortunately, dilute mineral acid hydrolysis not only removes the glucose entities but also effects Wagner-...
user55119's user avatar
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5 votes
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USNCO question - Finding pH of salt solution from pKa of its parent acid

Sodium cyanide is a salt formed by a strong base and a weak acid, so the reduced ionic equation of hydrolysis is $$\ce{CN- + H2O <=>[$K_\mathrm{h}$] HCN + OH-}$$ $$ \begin{align} K_\mathrm{h} &...
andselisk's user avatar
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5 votes
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Why are polysaccharides not sweet in taste?

Well, while indeed polysacharides are metabolised to simpler units, even in mouth (saliva in the mouth can account for 30% of initial starch digestion), it usually doesn't happen fast enough, so full ...
A.Fleming's user avatar
5 votes
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Why does hydrolysis of OF2 give a neutral solution?

Hydrolysis doesn't give a neutral solution, but the hydrolysis reaction is slow Don't confuse dissolving something in water with hydrolysis. Some chemicals hydrolyse rapidly in water but not OF2. ...
matt_black's user avatar
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5 votes
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Hydrolysis under basic medium

Going by the mechanism of hydrolysis under basic medium, the lone pair of hydroxide ion will attack on C=O carbon. Due to the negative mesomeric (-M/-R) effect and negative inductive effect of the ...
Sidharth Giri's user avatar
5 votes
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Rate of hydrolysis of silicon tetrahalides

We can justify the rate of hydrolysis of Silicon tetrahalides if we just think on the statement carefully. The statement claims that the rate of hydrolysis is in the order $\ce{SiF4 > SiCl4 > ...
Soumik Das's user avatar
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5 votes
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Hydrolysis of (chloromethyl)cyclopropane: Is but-3-en-1-ol a possible product?

I'd say, yes it is possible. The pioneering work on interconversion reactions of cyclobutyl, cyclopropylcarbinyl, and allylcarbinyl derivatives has been done by John D. Roberts and coworkers (Ref.1). ...
Mathew Mahindaratne's user avatar

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