Multiple Choice
Which anion will produce a colorless, odorless gas when hydrochloric acid (HCl) is added to its solid or solution?
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4. BONUS: Lab Techniques and Procedures
Test for Ions and Gases
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Which of the following reagents is best suited for the detection of starch?
A
Iodine solution
B
Silver nitrate solution
C
Sodium hydroxide solution
D
Benedict's solution
Verified step by step guidance1
Understand the nature of starch: Starch is a polysaccharide composed of glucose units and has a helical structure that can interact with certain reagents to produce a characteristic color change.
Recall the common reagents used for detecting different substances: Iodine solution is known to form a blue-black complex with starch, indicating its presence.
Consider the other reagents: Silver nitrate solution is typically used to test for halide ions, sodium hydroxide solution is a strong base used in various reactions but not specific for starch, and Benedict's solution is used to detect reducing sugars, not starch.
Identify the reagent that specifically interacts with starch to give a visible color change: Iodine solution fits this criterion because it inserts into the helical structure of starch, producing a distinct blue-black color.
Conclude that iodine solution is the best suited reagent for starch detection based on its specific and well-known reaction with starch molecules.
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