Solubility of some sugars in different solvents...?

Question

Help! tell whether they're soluble, insoluble or slightly soluble and provide some explanations. much thanks...

glucose in water
glucose in 10% NaCl
glucose in 0.2% HCl
glucose in 95% Ethanol


galactose in water
galactose in 10% NaCl
galactose in 0.2% HCl
galactose in 95% Ethanol


fructose in water
fructose in 10% NaCl
fructose in 0.2% HCl
fructose in 95% Ethanol

lactose in water
lactose in 10% NaCl
lactose in 0.2% HCl
lactose in 95% Ethanol


sucrose in water
sucrose in 10% NaCl
sucrose in 0.2% HCl
sucrose in 95% Ethanol


xylose in water
xylose in 10% NaCl
xyose in 0.2% HCl
xylose in 95% Ethanol

Answer 1

Sugars are organic substances and only dissolve for sure in solvents of the organic type. For the most part. There are a few exceptions as all Chemistry has exceptions. LOL! So-definitely soluble in EtOH and everything else you will have to look up.

Answer 2

Galactose Solubility

Answer 3

The answer is provided against the the item.



glucose in water (Soluble)

glucose in 10% NaCl (soluble)

glucose in 0.2% HCl (soluble)

glucose in 95% Ethanol (slightly soluble)



All other sets will follow the same pattern of answer. Explanation for this behaviour is that all the sugars are monosaccharides or disaccharides. These sugars are quite soluble in water. because the are polyhydroxy compounds. Becasuse of large nimber of hydroxyls groups the sugar molecules are quite polar in nature so these are soluble in a polar solvent like water.



10% NaCl or 0.2% HCl contains large amount of water nad presence of NaCl or HCl will have a little effect on the solubility of the sugars.



Ethanol being less polar than water the sugars will have much less solublity in 95% ethanol.



REST TO FOLLOW THE SAME TREND.





galactose in water

galactose in 10% NaCl

galactose in 0.2% HCl

galactose in 95% Ethanol





fructose in water

fructose in 10% NaCl

fructose in 0.2% HCl

fructose in 95% Ethanol



lactose in water

lactose in 10% NaCl

lactose in 0.2% HCl

lactose in 95% Ethanol





sucrose in water

sucrose in 10% NaCl

sucrose in 0.2% HCl

sucrose in 95% Ethanol





xylose in water

xylose in 10% NaCl

xyose in 0.2% HCl

xylose in 95% Ethanol

Answer 4

sugar is basically soluble in water due to the free OH groups which form hydrogen bonds with the water molecules. Salt is an ionic substance (solid). Ionic substances are soluble in water. Ionic means a molecule that contains a metal cation and an anion from group 7 usually. eg Sodium Chloride (cooking Salt) contains the Na+ cation and the Cl- anion

Answer 5

solubility of mannose in organic solvents