Why aqueous solution of sodium carbonate is basic in nature?

Question: Why aqueous solution of sodium carbonate is basic in nature?


Answer: Sodium bicarbonate is an amphoteric compound. Aqueous solutions are mildly alkaline due to the formation of carbonic acid and hydroxide ion:

NaHCO− 3 + H₂O → H₂CO₃ + OH⁻  

Question: Why is an aqueous solution of ammonium chloride acidic in nature?

Answer: A basic component is the one that produces hydroxide (OH^-) ions when dissolved in water. In aqueous solution of ammonium chloride, ammonium ions (NH4⁺) first associate with H₂O and form ammonia and hydroxide ions.

NH₄Cl + H₂O = NH₄⁺ + HCl ( equation 1)

NH₄⁺ + H₂O = NH₃ + OH^- (equation 3)

Since ammonium ions produce hydroxide ions, NH4⁺ are considered to be the basic components.
For more Questions: Visit: www.jsuniltutorial.weebly.com/ 
and:
http://chemistryadda.blogspot.in/2011/06/extrascore-science-acid-base-and-salt.html