Question: why nahco3 and na2co3 are basic in nature?
Answer: Answer: Because NaHCo3 and Na2Co3 are the products when NaOH reacts with H2CO3 . Hair Sodium Hydroxide is a strong base and carbonic acid is is weak acid due to which basic effect is more and hence sodium bicarbonate and sodium carbonate is basic in nature in aqua solution also.