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Question 2. 1. The Du-Nuoy ring method employs a hollow ring with radius 10 mm to measure oil-water interfacial tension (IFT). Assume a perfectly wetting ring was used for the experiment (Figure 1). Figure 1: Du-Nuoy Ring used to measure interfacial tension a. In an experiment involving the measurement of liquid A – water IFT, the total weight measured by the instrument was 0.5 grams. The weight of the hollow ring used was 0.05 grams. Assuming a perfectly wetting ring, what is the IFT for liquid A-water in mN/m? b. If the experiment used a solid ring of weight 0.05 grams to measure liquid A-water IFT, what net force (in Newton) would the instrument measure? c. The hollow ring (used in part la) was used to measure liquid B – water IFT and the net weight measured by the instrument was now 0.2 grams. What is the liquid B – water IFT in mN/m? d. Can you comment on which liquid (A or B) is more miscible with water? Why? State any assumptions that you would make while performing this experiment.

Question 2. 1. The Du-Nuoy ring method employs a hollow ring with radius 10 mm to measure oil-water interfacial tension (IFT). Assume a perfectly wetting ring was used for the experiment (Figure 1). Figure 1: Du-Nuoy Ring used to measure interfacial tension a. In an experiment involving the measurement of liquid A – water IFT, the total weight measured by the instrument was 0.5 grams. The weight of the hollow ring used was 0.05 grams. Assuming a perfectly wetting ring, what is the IFT for liquid A-water in mN/m? b. If the experiment used a solid ring of weight 0.05 grams to measure liquid A-water IFT, what net force (in Newton) would the instrument measure? c. The hollow ring (used in part la) was used to measure liquid B – water IFT and the net weight measured by the instrument was now 0.2 grams. What is the liquid B – water IFT in mN/m? d. Can you comment on which liquid (A or B) is more miscible with water? Why? State any assumptions that you would make while performing this experiment.

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Question 2. 1. The Du-Nuoy ring method employs a hollow ring with radius 10 mm to measure oil-water interfacial tension (IFT). Assume a perfectly wetting ring was used for the experiment (Figure 1). Figure 1: Du-Nuoy Ring used to measure interfacial tension a. In an experiment involving the measurement of liquid A – water IFT, the total weight measured by the instrument was 0.5 grams. The weight of the hollow ring used was 0.05 grams. Assuming a perfectly wetting ring, what is the IFT for liquid A-water in mN/m? b. If the experiment used a solid ring of weight 0.05 grams to measure liquid A-water IFT, what net force (in Newton) would the instrument measure? c. The hollow ring (used in part la) was used to measure liquid B – water IFT and the net weight measured by the instrument was now 0.2 grams. What is the liquid B – water IFT in mN/m? d. Can you comment on which liquid (A or B) is more miscible with water? Why? State any assumptions that you would make while performing this experiment.
Transcribed Image Text:Question 2. 1. The Du-Nuoy ring method employs a hollow ring with radius 10 mm to measure oil-water interfacial tension (IFT). Assume a perfectly wetting ring was used for the experiment (Figure 1). Figure 1: Du-Nuoy Ring used to measure interfacial tension a. In an experiment involving the measurement of liquid A – water IFT, the total weight measured by the instrument was 0.5 grams. The weight of the hollow ring used was 0.05 grams. Assuming a perfectly wetting ring, what is the IFT for liquid A-water in mN/m? b. If the experiment used a solid ring of weight 0.05 grams to measure liquid A-water IFT, what net force (in Newton) would the instrument measure? c. The hollow ring (used in part la) was used to measure liquid B – water IFT and the net weight measured by the instrument was now 0.2 grams. What is the liquid B – water IFT in mN/m? d. Can you comment on which liquid (A or B) is more miscible with water? Why? State any assumptions that you would make while performing this experiment.
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