Question

Hey folks ! Refer to the attachment please

⚠️No spams​

Answer 1

Answer : There will be no observed changes in first case while in second

case brisk effervescence will be seen.

Explanation: In test tube A

Since,both the reactants contained Na+ or Sodium icon, no visible reaction occurs.

It test tube B

2HCI+Na2CO3— NaCI+H2o+CO2

HCI is hydrochloric acid, Na2Co3 is sodium carbonate, NaCI is salt , H2o is

water and CO2 is Carbon dioxide gas released visible as brisk effervescence.

Answer 2

Observations in test tube A:

• No visible reaction seems to occur.
• No particular reaction involved.

Observations in test tube B:

• Both the hydrochloric acid and sodium carbonate will dissociate completely in solution. The hydrogen ions will bond with an oxygen of the carbonate leaving you with Water, carbon dioxide, and dissolved NaCl.
• HCl + Na2CO3 → NaCl + CO2 + H2O