What happens to the colour of methyl orange and phenolphthalein when in contact with
* lime water
*lime juice
*sodium carbonate
*copper sulphate
*sodium chloride
Answers
Answered by
0
Is Phenolphthalein suitable for this reaction (Na2CO3 + H2SO4) ?
Hello, I would like to find out whether or not the indicator Phenolphthalein is suitable for the reaction between sodium carbonate
Best Answer
No, it is an unsuitable indicator. Carbonate is a weak base, and bicarbonate even more so, meaning phenolphthalein will change colour before the reaction is completed.
The reaction of a carbonate with acid initially causes the formation of a bicarbonate. This will react further to form carbonic acid, which decomposes.
CO3^2- + H^+ → HCO3^-
HCO3^- + H^+ → H2CO3
H2CO3 → H2O + CO2
Methyl orange would be a better indicato
Hello, I would like to find out whether or not the indicator Phenolphthalein is suitable for the reaction between sodium carbonate
Best Answer
No, it is an unsuitable indicator. Carbonate is a weak base, and bicarbonate even more so, meaning phenolphthalein will change colour before the reaction is completed.
The reaction of a carbonate with acid initially causes the formation of a bicarbonate. This will react further to form carbonic acid, which decomposes.
CO3^2- + H^+ → HCO3^-
HCO3^- + H^+ → H2CO3
H2CO3 → H2O + CO2
Methyl orange would be a better indicato
Similar questions