Reaction:  NaHCO3(aq)  +  HCl(aq)   ®   NaCl(aq)  +  CO2(g)  +  H2O(l)   Methyl orange is a pH indicator. It is yellow above pH 4.4, orange between pH 4.4 and 3.2 and red below pH 3.2.  NaHCO3 is a weak base and it must be acidified to about pH 4 to completely neutralize it.  Why did you test the reaction mixture with this indicator before you began the evaporation step?

Chemistry: The Molecular Science
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ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
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Reaction: 

NaHCO3(aq)  +  HCl(aq)   ®   NaCl(aq)  +  CO2(g)  +  H2O(l)

 

Methyl orange is a pH indicator. It is yellow above pH 4.4, orange between pH 4.4 and 3.2 and red below pH 3.2.  NaHCO3 is a weak base and it must be acidified to about pH 4 to completely neutralize it.  Why did you test the reaction mixture with this indicator before you began the evaporation step?

 

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