An unknown liquid sample is tested for chemical composition. You receive the following results: iodine test = yellow; biuret test = purple; Benedict's test = red; and paper lipid test = clear. …

Bluret test: When urea is heated just above its melting point it forms a compound called biuret which gives a violet colour with dilute copper sulphate in alkaline medium.

The above reaction is a test of urea because on adding an alkaline solution of copper sulphate to white solid biuret, a violet colour is obtained. Was this answer helpful?

The biuret test typically turns violet in the presence of proteins or peptides, but in this case, the solution would remain the color of the reagent (typically blue).

2) Saliva Biuret’s test - Saliva + Biuret’s reagent - Colour changes from light blue to purple. Proteins are present. Grease test - On a brown paper, add a drop of saliva - No translucent …

Jerell has tested samples of food left by the thief. They reacted positively to the Lugol test, Biuret test, and Sudan test. What kind of meal might the thief have eaten to leave those …

INSTRUCTION: Check which test (s) will yield a positive result for the given compounds. Biuret Test Ninhydrin Test Hopkin’s Cole Test Xanthoproteic Test Millon’s Test Lead Sulfide Test …

Biuret is a condensation compound of urea equivalent to two molecules of urea less one of ammonia. The parent compound can be prepared by heating urea above the melting point at …

Four foods were tested for fat (using ethanol), protein (using the biuret test), reducing sugar (using Benedict's solution), starch (using iodine solution). Which food contains protein and starch? …