Question

4. Rinse out your jars once again. Place a very small amount (about 1/8 tsp.) of baking soda (NaHCO3) into a jar. Pour some vinegar (CH3COOH) onto the baking soda and observe. Google this if you do not have the substance. a. What happened? b. Is there any baking soda remaining? Yes/No If you answered yes, pour some more vinegar on it. Can you make it disappear completely? c. Where did the baking soda go? d. How?

Answer 1

Answer a :

The baking soda i.e. sodium bicarbonate is a weak base and vinegar is a weak acid. Hence, when we add vinegar into baking soda, at first a acid-base reaction takes place forming carbonic acid and sodium acetate. Later the carbonic acid decompose to carbon dioxide and water. Hence after some time of adding vinegar into baking soda gas is evolved from the solution.

Answer b :

No baking soda is remained in the solution. The baking soda is completely dissolved into baking soda.

Answer c :

The baking soda is conveted into water and carbon dioxide which is evolved from the solution.

Answer d :

When vinegar is added to the solid baking soda , first it dissolves into the vinegar. As vinegar is a weak acid and baking soda is a weak base, hence a acid-base reaction takes place, forming carbonic acid and sodium acetate. Later the carbonic acid decomposes into carbon dioxide and water.

i.e. CH3COOH + NaHCO3NaHCO3 = CH3COONa + H2CO3

H2CO3 = H2O + CO2