Question

what is the chemical indicator that is used to test for starches (carbohydrates) in this virtual lab?
iodine
sodium hydroxide
sodium hydroxide & copper sulfate combined
copper sulfate

Explanation:

Iodine is a well - known chemical indicator for starch. When iodine comes into contact with starch, it forms a blue - black complex. Sodium hydroxide is a strong base and not used for starch testing. The combination of sodium hydroxide and copper sulfate (Benedict's reagent or Fehling's solution) is used for testing reducing sugars, not starch. Copper sulfate alone is not used for starch testing.

Answer:

A. iodine