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Answer to Question #8946 in Organic Chemistry for Maria

Question #8946
How will blue and red litmus paper react with neutralisation reactions and why? These are the reactions: HCl+NH3, CH3COOH+NH3, HCl+NaOH, CH3COOH+NaOH.
Expert's answer
In this case is important as behaving in a neutralization products in water

HCl + NH3 = NH4Cl
NH4Cl + H2O = NH4OH (weak base) + HCl (strong acid) so litmus paper will be red,because one of products of hydrolysis is stronger that another HCl (strong acid)

CH3COOH + NH3 = CH3COONH4
CH3COONH4 + H2O = CH3COOH (weak acid) + NH4OH(weak base)
HCl + NaOH = NaCl + H2O
NaCl + H2O = NaOH (strong base) + HCl(strong acid)
The color indicator will not change as the reaction product is not revealing any basic or acidic properties

CH3COOH + NaOH = CH3COONa + H2O
CH3COONa + H2O = CH3COOH (weak acid) + NaOH (strong base) so litmus paper will be blue,because one of products of hydrolysis is stronger that another NaOH (strong base).

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