QQuestionBiochemistry
QuestionBiochemistry
What color changes occur during a positive result of the Benedict's test?
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Answer
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Step 1:I'll solve this problem step by step, focusing on the Benedict's test color changes.
Step 2:: Understanding the Benedict's Test
The Benedict's test is a chemical test used to detect the presence of reducing sugars, including simple sugars like glucose, fructose, and lactose. The test involves heating a sample with Benedict's reagent (a blue solution containing copper sulfate).
Step 3:: Color Change Progression
During a positive Benedict's test, the color changes progressively through several stages: - Initial color: Blue (before heating) - First color change: Green (indicates a small amount of reducing sugar) - Next color change: Yellow (indicates a moderate amount of reducing sugar) - Final color change: Orange to Brick Red (indicates a high concentration of reducing sugar)
Step 4:: Chemical Explanation
The color changes occur because the copper sulfate in Benedict's reagent is reduced by the sugar, causing a transformation in the copper ions' oxidation state. This reduction leads to the characteristic color progression.
Final Answer
In a positive Benedict's test, the color changes from blue → green → yellow → orange/brick red, with the final color indicating the concentration of reducing sugars present in the sample.
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