Science, asked by achuaj4631, 1 year ago

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 Anonymous
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

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