1.

Match the following pH values 1, 7, 10, 13 to the solutions given below: Milk of magnesia Gastric juices Brine Aqueous Sodium hydroxide. Amit and Rita decided to bake a cake and added baking soda to the cake batter.Explain with a balanced reaction, the role of the baking soda. Mention any other use of baking soda.

Answer»
• Milk of magnesia10
• Gastric juices1
• Brine7
Aqueous Sodium hydroxide13

Baking soda undergoes thermal decomposition to form Na2CO3, CO2 and H2O; CO2 makes the cake fluffy & soft

NaHCO3 \(\overset{Heat}{\longrightarrow}\) Na2CO3 + CO2 +H2O

Uses:-

Used in fire extinguishers/ antacid to neutralize excess acid in stomach / to neutralize the effect of acid in insect sting.



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