Wednesday, January 11, 2012

why does salt dissolveWhy does salt dissolve faster than sugar?

Why does salt dissolve faster than sugar in any kind of water temperature?
Salt occurs as (Na+Cl-)
The water molecules come between the atoms of salt , and thus breaks the ionic bonding b/w Na+ and Cl-.Na+ is attracted to the lone pair of oxygen atom of the water molecule and Cl-to the H atom of water molecule , thus hydrolysis and solvation of salt occurs, which makes the salt to dissolve fast whereas in sugars, the molecules are quite big and moreover sugar has a planar geometry , and contains bonds like -C-H, -C-OH-, -C-Owhy does salt dissolve-C-, these breaking of these bonds require more energy and moreover -C- is non-polar, thus increasing the no. of C atoms will make a compound to dissolve less in water. Sugar has 6 Carbon atoms.
Thus to dissolve sugar , we need stirring.
Cause it's less dense, I guess.
Salt is NOT less dense than sugar (see your other question that I answered).

How are you measuring the speed at which it dissolves?
Or by speed, are you really refering to the ease at which salt or sugar will dissolve?

Table salt (NaCl) has a solubility in wwhy does salt dissolveater of about 35 g of NaCl per 100 mL of water at 20 degrees C.
"Table" sugar (Sucrose) on the other hand has a solubility of about 200 grams of sucrose per 100 mL of water.
Sugar is much much more soluble than Salt.

However, the speed at which something dissolves is determined by how easily the water molecules can surround the molecules of the solute and form a solution. Sugar molecules are quite large whereas when salt dissolves, it breaks up into Na+ and Cl- ions in solution.
salt is less dense

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