Gross Flashcards
Grams per deciliter
No of grams present in 100mls of solution
Retardation factor in paper chromatography
The ratio of the distance moved by the solute
To distance moved by the solvent
Solute front to solvent front
Titratable acidity
No of hydrogen ions( free or bound) capable of being neutralized by a base
Conjugate base and conjugate acid
The conjugate base of an acid is the base with one proton less than the acid and the conjugate acid of a base is that acid with a proton more than the base
Negative logarithm of dissociation constant Ka
PK
Why can’t KA be calculated for a strong acid
Ka cannot be calculated for a sting acid because the dissociation reaction of a sting acid is a non equilibrium (one way) reaction and Ka is an equilibrium Constant
What is an indicator
Indicator is a weak organic acid or base that is used to indicate the end point of a chemical reaction by a specific color change
Molisch rest
For non nitrogenuous carbohydrates General test for all carbohydrates Treatment with H2So4 Violet coloured products Voilet ring formed at the junction of the two layers- present of carbohydrate
Fehling test
Detect reducing sugars (Monosaccharides - galactose, glucose,ribose, xylose Disaccharide-lactose, maltose) Hemiacetal group ** Fructose gives positive test
Brick red precipitate
Benedict test
All reducing sugars give positive
Sucrose is negative
Reddish brown is positive
BaRfoed test
Reducing sugars
Can distinguish reducing monosaccharides from reducing disaccharides
Disaccharides are not strong reducing agent
Will take a longer time to show a positive
Reddish brown positive
Fearons test
Only lactose and maltose
Yellow to red color change
Methylanine hydrochloride solution
Foulgers test
For fructose
Saliwanoff test
- Carbon monosaccharides
Sugar and fructose
Cherry red color complexes
Positive -6 carbon sugar is present, keto sugar
Taubers test
Pentose sugar
Cherry red colour
