Biology help benedicts

Hi, please could I have help on why 3 is incorrect? I thought a precipice forms in Benedict’s?
Question: https://ibb.co/p6pdQYjV
Thanks!

Reply 1

Nitrotoluene

Original post

by anonymous56754

Hi, please could I have help on why 3 is incorrect? I thought a precipice forms in Benedict’s?
Question: https://ibb.co/p6pdQYjV
Thanks!

The Benedict's test indicates a positive result, but measuring the rate of solid particle formation may not be the most effective method for quantifying sugar concentrations. It's really tough to see exactly when those first little changes happen, you know?
It's difficult to pinpoint the exact start of the reaction.
What constitutes "fast" in this context? Is it the appearance of the first trace, or when the solution becomes entirely turbid? Without a clear standard, relying on timing feels arbitrary.
A more reliable approach involves observing the colour change. We're essentially measuring the amount of copper(I) oxide produced. Comparing the final colour to a standardized colour card seems more straightforward than attempting to time the formation of the precipitate.
While timing might be a possible approach, I believe assessing by colour offers a more accurate and objective method, as the timing approach feels overly subjective.

Basically, I think option three has issues. IMHO...of course!

Krgds,
Sandro

(edited 8 months ago)