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Why do you use ammonium chloride rather than only water in the of the grignard reaction?
Wiki User
∙ 12y ago
It acidifies the solution, so we can protonate and generate the alcohol in the final step. I assume you're making an alcohol from a ketone or ester?
Wiki User
∙ 12y ago
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Why is benzene formed during Grignard reactions using phenylmagnesium bromide?
Grignard reactions must be carried out in an anhydrous environment in an anhydrous solvent (e.g. anhydrous ether). Why? Grignard reagents behave essentially as a carbanion, and are extremely reactive. Therefore they cannot be carried out while acidic hydrogens, or other positive reactive centers are present (carbonyl compounds such as acetone) in the reaction mixture because there is no way to stop the Grignard from reacting with these other compounds rather than the desired reactant. If phenylmagnesium bromide were prepared, and ANY water was present in the reaction mixture phenylmagnesium bromide would not hesitate to react with water--stealing one of its hydrogens. This hydrogen would therefore replace the attached --MgBr to form benzene.
How does aqueous ammonium sulfate precipitate proteins?
Water molecules bind to ammonium and sulfate ions rather than proteins.
Why was evaporation used to determine the mass percentage of potassium chloride rather than filtration or recrystallization?
snoopy
What happens when combining Aluminum with Tin II Chloride?
I'm betting that it varies depending on molarity and amount, but when I reacted 10mL of 1.0 Tin (II) chloride with 5.0 grams of Aluminum powder, there was a rather violent reaction that sent up a brief cloud of aluminum (and probably a bit of the chloride solution) and got the product all over the container it was in due to me recoiling and knocking over the beaker. It was a bit of a blur to be honest, but that's basically what happened to me. Also, AlCl3 was likely formed.
Why is the II in copper II chloride important?
the II means that the charge of the copper, in this case, is +2, rather than, say, +1, which is copper's other possible charge. the formula for copper II chloride is CuCl2, rather than copper I chloride, which is simply CuCl. for all transition metals which have multiple charges, it is necessary to state the particular charge thet the atom is using.
Why there is no water formation in the neutralisation reaction between ammonia and HCl?
Water is only formed if there is oxygen atom present and in this reaction no oxygen atom is present. Rather than neutralisation it is a combination reaction in which ammonia and HCl combine to produce ammonium chloride.
What do you observe when the mouth of the bottle of hydrochloric acid and a bottle of ammonia are brought together?
You might see the smokey 'fume' of ammonium chloride solid particles formed by reaction of escaping ammonia and hydrogen chloride gas, at best seen when solutions are rather concentrated.NH3(g) + HCl(g) --> NH4Cl(s)
Is ammonium chloride made of with hydrochloric acid and chlorine?
No, it is usually made by mixing ammonia (NH3) and hydrochloric acid (HCl). However ammonium chloride is a pure, new substance rather than a mixture of these two. NH3(gas) + HCl(gas) --> NH4Cl(solid) ('fume of salmiak')
Why is benzene formed during Grignard reactions using phenylmagnesium bromide?
Grignard reactions must be carried out in an anhydrous environment in an anhydrous solvent (e.g. anhydrous ether). Why? Grignard reagents behave essentially as a carbanion, and are extremely reactive. Therefore they cannot be carried out while acidic hydrogens, or other positive reactive centers are present (carbonyl compounds such as acetone) in the reaction mixture because there is no way to stop the Grignard from reacting with these other compounds rather than the desired reactant. If phenylmagnesium bromide were prepared, and ANY water was present in the reaction mixture phenylmagnesium bromide would not hesitate to react with water--stealing one of its hydrogens. This hydrogen would therefore replace the attached --MgBr to form benzene.
Why magnesium is used in grignard reagent?
The point of a Grignard reaction is to form a new carbon-carbon bond. To do this, you need a reagent with a relatively negative carbon. This is unusual, since carbon has a fairly low electronegativity - 2.5 - and thus generally has a partial positive charge, rather than a negative one. However, magnesium has an even lower electronegativity, namely, 1.2. The large difference in electronegativity between carbon and magnesium, 1.3, creates a very polar covalent bond between the two when they are bonded to each other. Thus, magnesium is necessary in the Grignard reagent because it creates the partial negative charge on the carbon to which it is bound, allowing the reaction to happen.
How does aqueous ammonium sulfate precipitate proteins?
Water molecules bind to ammonium and sulfate ions rather than proteins.
What type of reaction is NaCI?
NaCl is not a reaction, but rather a compound.
Why is benzene undergoes electrophilic reaction rather then nucleophilic reaction?
jaom maran
What is the equation of the reaction between cobalt chloride and ethanol?
Don't quote me on this - I'm just a Year 12 student trying to figure this out but... As I understand it the cobalt chloride does not actually react with the ethanol but rather the ethanol has an effect on the equilibrium reaction: Co(H2O)62+ + 4Cl-(aq) D CoCl42-(aq) + 6H2O(l) The ethanol separates the cobalt chloride from the water pushing the reaction towards the right hand side (blue) to restore equilibrium (Le Chatelier's principle). When water is added more H2O can react with the CoCl42-(aq) pushing the reaction back towards the left hand side (pink). I hope this helps and I'm sorry if I'm wrong!
What is the meaning of the word catalyst?
A catalyst speeds up a reaction by lowering the activation energy of the reaction. It is not consumed by the reaction, but rather it leaves the reaction unchanged.
What is the meaning of word catalyst?
A catalyst speeds up a reaction by lowering the activation energy of the reaction. It is not consumed by the reaction, but rather it leaves the reaction unchanged.
When a solution of sodium sulfide and iron III chloride are mixed what precipitate if any is formed?
FeCI3 +3NaOH ->Fe(OH)3 +3NaCIIron (III) chloride + Sodium Hydroxide ---> iron (III) hydroxide + sodium chloride
