You Have Two Bottles,each of Which Contains a White,crystalline Substance

question 19

Multiple Choice

You have two bottles,each of which contains a white,crystalline substance.Your lab director tells you that one contains lactose and the other sucrose.Your job is to determine which bottle contains which sugar.Which procedure would you use?

• A)Test both for solubility in water.Sucrose is very soluble;lactose is only minimally soluble.
• B)Test for the ability to reduce Ag+.Only lactose will react.
• C)Dissolve each in water and record the pH.Lactose is far more acidic than sucrose.
• D)React each with bromine (Br₂)water.Only sucrose will react.

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