8. While preparing the solution of silver nitrate in
distilled water, we always add a few drops of nitric
acid. Explain your answer.
9. Show the hydrolysis of sodium carbonate?
10. How does carbonates react with dilute acids ?
Plzz give answer fast
Answers
Answer: 8. Nitric acid increases the solubility of silver nitrate.
9. When sodium carbonate dissolves in water it dissociates into two sodium (Na+) ions and a carbonate (CO3–2) ion;-
Na2CO3 (s) —-> 2 Na+(aq) + CO3–2(aq)
The carbonate ion is able to remove protons (H+) from water to form bicarbonate ions and hydroxide ions. Hence it is the conjugate base of the bicarbonate ion;
CO3–2(aq) + H2O(l) ←-> HCO3-(aq) + OH-(aq)
The overall increase in OH- ions due to these reactions results in an increase in the pH of the solution, and cause it to become alkaline.
10. When acids react with carbonates, such as calcium carbonate (found in chalk, limestone and marble), a salt, water and carbon dioxide are made. The carbon dioxide causes bubbling during the reaction, which is observed as fizzing. It can be detected by passing the gas through limewater, which will go cloudy.