Question

. In a set-up for the experiment to show that CO2 is given out during respiration by use of KOH solution. In the experiment set-up, student A, B and C dipped the other end of bent tube in water, lime water, KOH solution respectively. Student D did not use water or any other solution in beaker. Which set-up is correct.
a) Set-up of student D
b) Set-up of student C
c) Set-up of student B d) Set-up of student A
d) Set-up of student A

Answer 1

Answer:

Student B

Explanation:

During respiration, CO2 is given out as a by-product.

This CO2 when reacts with Lime Water or Slaked Lime or Calcium Hydroxide [Ca(OH)2], the Ca(OH)2 turn milky due to formation of CaCO3[(Calcium Carbonate)].

This reaction is shown as below:

CO2(g) + Ca(OH)2(Aq) ------------> CaCO3(Aq) + H2O(l)

The above formation of  CaCO3(Aq) which turns the lime water milky would not take place in any other solution.

Hence, the setup of Student B is correct.

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