Multiple Choice
Which of the following substances is highly soluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following methods can be used to determine if a sugar solution is saturated?
A
Add more sugar; if it does not dissolve and settles at the bottom, the solution is saturated.
B
Test the pH; a saturated solution will have a lower pH than an unsaturated solution.
C
Check the color; a saturated sugar solution will turn dark brown.
D
Measure the temperature; a saturated solution will always be colder than an unsaturated one.
Verified step by step guidance1
Understand the concept of saturation in a solution: A saturated solution contains the maximum amount of solute (in this case, sugar) that can dissolve at a given temperature. Any additional solute added will not dissolve and will remain as a solid.
Consider the method of adding more sugar to the solution: If the added sugar dissolves completely, the solution was unsaturated. If the sugar does not dissolve and settles at the bottom, the solution is saturated.
Evaluate other methods mentioned: Testing pH, checking color, or measuring temperature are not reliable indicators of saturation for sugar solutions because sugar does not significantly affect pH, color, or temperature in a way that indicates saturation.
Conclude that the practical and direct method to determine saturation is to add more sugar and observe whether it dissolves or not.
Remember that saturation depends on temperature, so the test should be done at a constant temperature to avoid confusion.
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