Question

Nitya took two test tubes A and B. In test tube A she put 10 mL of dilute NaOH and in test tube B she put 10 mL of dilute HCl. Write the changes observed in both the test tubes on adding a pinch of sodium carbonate and also write the chemical reaction involved.

Answer 1

Answer:

There will be no observed change in first case while in second case brisk effervescence will be seen.

In test tube 1 -

Since, both the reactants contains Na+ or sodium ions, no visible reaction occurs.

In test tube B -

2HCl + Na2CO3 -> NaCl + H2O + CO2

HCl is hydrochloric acid, Na2CO3 is sodium carbonate, NaCl is salt, H2O is water and CO2 is Carbon dioxide gas released visibly as brisk effervescence.

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