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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Estimation of entropy and free energy change of a reaction

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According to the experiment, at which temperature the reaction becomes spontaneous?

a: 20°C Explanation

Explanation

b: 30°C Explanation

Explanation

c: 40°C Explanation

Explanation

d: 50°C Explanation

Explanation

Before doing the main experiment, why do we need to titrate the HCl solution against Na₂CO₃ solution?

a: HCl is a primary standard. Explanation

Explanation

b: HCl is not a primary standard. Explanation

Explanation

c: HCl is not completely soluble. Explanation

Explanation

d: Na₂CO₃ is not a primary standard. Explanation

Explanation

According to the experiment, the color of Bromocresol Green at pH ~ 4 is

a: Blue Explanation

Explanation

b: Colorless Explanation

Explanation

c: Yellow Explanation

Explanation

d: Purple Explanation

Explanation

The unit of the solubility product (ksp) of Borax is

a: mol dm⁻³ Explanation

Explanation

b: mol²dm⁻⁶ Explanation

Explanation

c: mol³dm⁻⁹ Explanation

Explanation

d: Unitless Explanation

Explanation

Before titrating the Borax solution, why do we keep the solution in the water bath for minimum 10 minutes?

a: To reach make the reaction spontaneous Explanation

Explanation

b: To increase the solubility of Borax. Explanation

Explanation

c: To increase reaction free energy. Explanation

Explanation

d: To ensure temperature equilibrium between Borax solution and water bath. Explanation

Explanation

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