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A2 CHEMISTRY
1
HOMEWORK
(a) Describe what you would see and write the equations for the reactions of propanoic acid with:
(i)
a solution of sodium carbonate
Observation………………………………………………………………….........................................
Equation………………………………………………………………………………………………...
(b) Propanoic acid can be prepared from propanal, CH3CH2CHO. State the reagents for this
conversions.
Reagents………………………………………………………………………………………………..
© Methanoic is produced when the ester, methyl ethanoate reacts with sodium hydroxide solution.
CH3COOCH3 + NaOH
→
CH3COONa + CH3OH
It is also produced when methyl ethanoate reacts with an acid such as hydrochloric acid.
(i)
Classify the type of reaction taking place between methyl ethanoate and sodium hydroxide
solution.
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(ii)
Explain why is it better to make methanol by reaction methyl ethanoate with sodium
hydroxide solution, rather than with hydrochloric acid.
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2. Methanoic acid and ethanol react together to form ethyl methanoate, HCOOC2H5, and water.
(a)
Draw the full structural formula of ethyl methanoate , showing all bond.
(b)
what type of organic compound is ethyl methanoate?
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(c)
3.
Esters can be hydrolysed by heating with dilute hydrochloric acid to form an alcohol and a
carboxylic acid.
(a)
(i)
Name the ester CH3COOCH3
(ii)
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Write an equation for the hydrolysis of this ester.
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b)
Suggest the role of hydrochloric acid in this hydrolysis.
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Write equation, using displayed formulae, for the reaction below:
(ii)
propyl methanoate with NaOH
(c)
An ester formed by a reaction with butanol has a relative molecular mass of 116.
Deduce the molecular formula of this ester.
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(ii)
State one use of esters other than as a flavouring in foods.
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d)
(i)
Write equation for the reaction and name any organic products:
propanoic acid with methanol
(ii)
State how you would find the relative molecular mass of an ester from its mass spectrum.
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4. Consider the following compounds
(a)
Name the functional groups present in the three compounds.
Compound
Functional groups presnt
X
Y
Z
(b) Give the IUPAC names of each of the compounds
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