9. Carry out the following Activity (Page 10):
Take about 2 g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?
Answer:
Aim: To observe if the reaction between barium hydroxide and ammonium chloride is exothermic or endothermic and conclude based on that.
Materials Required: 2 g barium hydroxide, 1 g of ammonium chloride, glass rod, test tube, spatula.
Procedure:
(i) Using a spatula put 2 g of barium hydroxide in the test tube.
(ii) Next, using the spatula put 1 g of ammonium chloride in the test tube.
(iii) Now, mix with the help of a glass rod.
(iv) Touch the bottom of the test tube with your palm and observe what you feel.
Observations: The bottom of the test tube becomes cold.
Conclusions:
- The reaction is an endothermic reaction because it absorbs heat from the surroundings.
- Barium chloride and ammonium hydroxide are formed. The double displacement reaction is shown below:
Ba(OH)2 + 2NH4Cl + heat → BaCl2 + 2NH4OH
“9. Carry out the following Activity (Page 10):
Take about 2 g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix with the help of a glass rod. Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?” – Solved.
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Solution to Activity 1.8
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Solution to Activity 1.10
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