Biology Pratical work
- Created by: Vss2017
- Created on: 24-11-17 10:49
Fullscreen
Qualitative Test's - Show if certian substances are present not amounts.
- Benedict's test is used to detect Reducing Sugars.
Cannot distinguish between different monosaccharides.
(A REDUCING SUGAR is a suagr which can donate electrons to Benedict's reagent.)
Reducing sugar + Benedict's solution + Heated in a water bath
Colour change- blue, green, yellow, orange, brick red precipitate.
(Non-Reducing Sugars E.G. all monosaccharide sugars and some disaccharide sugars- sucrose)
Non-Reducing sugars can be identified by a negative benedicts test result at first, but when HYDROLYSED , with DILUTE HYDROCHLORIC ACID and heating, then once cooled NEUTRALISE with sodium hydrogencarbonate and test with benedict's solution, it gives a POSITIVE result.
…
Comments
No comments have yet been made