What reagent amounts are used for 20 g and 26 g samples?

• A. 20 g – 1 scoop; 26 g – 2 scoops
• B. 20 g – 3 scoops; 26 g – 4 scoops
• C. 20 g – 2 scoops; 26 g – 4 scoops
• D. 20 g – 2 scoops; 26 g – 3 scoops

Answer: (D)

The concept being tested is applying a fixed reagent rate per unit mass of the sample and rounding to whole scoops. In this type of procedure, you use a consistent amount of reagent for each gram of sample, then round to the nearest scoop because you measure in whole scoops.

If the rate is 0.1 scoop per gram, then for a 20 g sample you multiply 20 by 0.1 to get 2 scoops exactly. For a 26 g sample, 26 × 0.1 = 2.6 scoops, which rounds to 3 scoops. That’s why the amounts are 2 scoops for 20 g and 3 scoops for 26 g. The other options don’t follow this same per-gram rate and rounding rule, so they wouldn’t align with the method’s requirements.