Virtual Labs

Determination of percentage composition of sugar solution from viscosity measurement

1. If the flow time of a sugar solution (denser than water) is longer than the flow time of water in the viscometer, what can be inferred about the viscosity of the sugar solution?

a: The sugar solution has a higher viscosity than water Explanation

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b: The sugar solution has a lower viscosity than water Explanation

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c: The viscosity of the sugar solution is approximately equal to that of water since sugar solution is denser than water but flows slower than water Explanation

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d: The viscosity of the sugar solution cannot be compared to that of water since sugar solution is more dense than water Explanation

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2. What does the graphical relationship between η (viscosity) and concentration of sucrose ?

a: Linear increasing Explanation

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b: Linear decreasing Explanation

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c: Square root Explanation

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d: Inverse square root Explanation

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3. What is the biggest advantage of using the Ostwald viscometer for this experiment?

a: It provides an easy way to calculate the flow pressure Explanation

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b: It can be used for different liquids Explanation

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c: It works for a range of temperatures Explanation

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d: It is made of glass which does not react with most liquids. Explanation

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4. Why is it important to measure the density of the sugar solutions accurately in this experiment ?

a: Density is used as an additional way to check the solutions. Explanation

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b: Density is used in the calculations of the coefficient of viscosity Explanation

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c: To ensure that the solutions have the correct concentrations Explanation

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d: Density is used to calculate the volumes of the solutions. Explanation

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5. What is the effect of using a viscometer with a capillary tube having a larger diameter

a: The flow rate will reduce Explanation

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b: The flow can become less smooth (laminar) Explanation

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c: The flow rate will increase Explanation

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d: The viscosity of the solution will decrease Explanation

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