Q3. Reaction 3: Vinegar and Baking Soda (Show this reaction in Chemistry Lab.) Vinegar + Baking Soda CO2 + Other Substance A. Identify the new substances formed in the above reaction? B. What happens when CO2 is passed through lime water? Q4. Reaction 4: Crystallization
Answers
Answer:
Baking soda and vinegar experiment
The materials The chemical reaction The physical changes Safety and disposal
This easy to undertake and safe experiment allows students to observe many of the features of chemical reactions as well as the three physical states of matter. This experiment clearly distinguishes a chemical change from physical change.
See the topics Chemical reactions and Physical change or chemical change? for more information.
The materials
Baking soda - Chemical name, sodium bicarbonate with formula NaHCO3.
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Vinegar - A dilute solution of acetic acid in water. Acetic acid is also known as ethanoic acid, with the formula CH3COOH.
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A beaker or jar.
The chemical reaction
When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution.
The reaction is:
Sodium bicarbonate and acetic acid reacts to carbon dioxide, water and sodium acetate.
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NaHCO3 + CH3COOH CO2 + H2O + Na CH3COO
The physical changes
The solid baking soda was placed in liquid vinegar producing carbon dioxide gas, which is evident because of the formation of bubbles in the foaming mixture. Eventually all of the solid dissolved and reacted producing a new liquid solution.
During the reaction, a solid and liquid have been chemically reacted to form a gas and a liquid. This experiment can also be used to explain foams, as liquids or solids containing gas bubbles.
Safety and disposal
Although both reactants are household chemicals and foodstuffs, caution should be taken not to get splashes in the eyes and clothes should be protected. The products of the reaction are relatively safe (Remember - no chemicals should be touched) and can be disposed of by washing down the sink with plenty of water.
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Answer: A) the new reaction is carbon dioxide.
B) calcium carbonate and water
Explanation: