Explain why all glassware must be dry and the solvent anhydrous during formation and reaction of a Grignard reaction. Explain wh
y it is advisable to not clean your glassware with acetone before a Grignard reaction. Include balanced chemical equations in your answer. (4 pts)
1 answer:
Answer:
The Grignard reagent will be destroyed
Explanation:
The Grignard reaction is based on a <u>carbanion</u> production (RMgX). If water is present in the glassware, a reaction can take place with and the <u>desired product will not be produced</u>. Because an "H" would be <u>transferred</u> from water to the Grignard reagent. (See figure 1)
If we have acetone in the glassware we will have a similar problem. The <u>Grignard reagent would be destroyed</u> and the desired product will not be produced. The Grignard reagent will attack the carbon in the carbonyl group and the carbanion would disappear. (See figure 2)
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Option (B) is the right answer.
Hydronium ion () concentration decreases by the <u>factor of 100</u>, if the pH of a solution increases from 2.0 to 4.0.
The hydrogen ion concentration in water is expressed by pH. Specific to aqueous solutions, pH is the <u>negative logarithm</u> of the hydrogen ion (H+) concentration (mol/L) :
Acidic solutions are those with a pH under 7, and basic solutions are those with a pH over 7. At this temperature, solutions with a pH of 7 are neutral (e.g.<u> pure water</u>). The pH neutrality <u>relies on temperature, falling below 7 if the temperature rises above 25 °C</u>.
<h3>Given: </h3>pH1( initial pH) = 2.0
pH2( initial pH) = 4.0
[H3O+] = initial hydronium concentration
[H3O+]* = final hydronium concentration
<h3>Formula used : </h3><h3>Solution: </h3>
Thus , the concentration of hydronium ion decreases by 100.
To learn more about pH :
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Answer:
number of moles of the compound 53 mole
Explanation:
Given that:
The total energy liberated = - 2870 kJ ( here , the negative sign typical implies the release of energy due to the combustion reaction)
The equation of the reaction can be represented as:
The energy needed to synthesize 1 mole of compound X = - 54.1 kJ.mol
Thus;
The total energy = numbers of moles of compound × Energy needed to synthesize 1 mole of compound X
Making the numbers of moles of the compound the subject; we have;
numbers of moles of compound =
number of moles of the compound = 53.04990 mole
number of moles of the compound 53 mole to two significant figure