Відповідь:
Plan of experiment:

Take two separate test tubes and label them as A and B.

Pour equal amounts of the two unknown solutions into test tubes A and B.

Add a few drops of potassium dichromate(VI) solution (K₂Cr₂O₇) to test tube A and a few drops of sodium hydroxide solution (NaOH) to test tube B.

Add a few drops of concentrated sulfuric acid (H₂SO₄) to both test tubes.

Observe the color changes in each test tube.

Expected results:

In test tube A, the solution will turn from orange to green, which indicates the presence of glycerol.

In test tube B, the solution will turn from colorless to pink, which indicates the presence of ethanol.

Reactions to confirm the results:

For glycerol:

C₃H₈O₃ + K₂Cr₂O₇ + 6H⁺ = 3Cr⁺³ + 3H₂O + CO₂

For ethanol:

C₂H₅OH + NaOH = NaC₂H₅O + H₂O

Пояснення: