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Rate of Dissolving

Factors that affect the process of dissolving

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Lemonade Dilemma

Rate of Dissolving

Recall: The rate of dissolving is a measure of how fast solute can be dissolved in solvent

Credit: User: RachaelChickswithKnives
Source: http://www.flickr.com/photos/87958395@N08/8043672330/
License: CC BY-NC 3.0

Let's make lemonade! [Figure1]

You and a friend decide to start a lemonade stand, but each one of you want to use a different recipe for making lemonade, one with powdered sugar and one with sugar cubes. The two of you decide to put your recipes to the test. You believe sugar cubes will make better lemonade; your friend belives that powdered sugar is better. Following the same ratio of water, lemons, and sugar in each experiment, the powdered sugar in your friend's method seems to dissolve instantly, whereas you are left with three floating chunks of sugar in your pitcher. It is apparent that your friend has bested you, and, angrily, you begin to stir the lemonade. The three lumps have now disappeared, and there is no discernible difference between the two pitchers. The two of you make up and go outside to begin selling lemonade.

Creative Applications

1.Why did the sugar in your friend's pitcher dissolve so quickly?

2. Why did the chunks in your lemonade start to disappear when you stirred vigorously?

3. Besides stirring, what other ways could you have dissolved your sugar?

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  1. [1]^ Credit: User: RachaelChickswithKnives; Source: http://www.flickr.com/photos/87958395@N08/8043672330/; License: CC BY-NC 3.0

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