Question

Solid sodium carbonate was placed on a strip of Ph paper. What was the change in colour?

Answer 1

Sodium carbonate acts an alkali or basic because when it is made to dissolve in water it dissociates into weak acid I. e. carbonic acid and strong alkali I. e sodium hydroxide (NaOH)
The reaction occurs as following:-

Na2CO3+H2O------>NaOH+H2CO3

HOPE THIS ANSWER HELPS AND IF HAVE ANY QUERIES PLEASE LET ME KNOW