What intra/intermolecular forces exist within a hydrate?

Take the hydrate #Na_2S_2O_3•5H_2O#. Are there ionic forces between the #Na+# and the #S_2O_3^ (2-)# and ion-dipole forces between the cation/anions and the water?

HELP! (THANKS)

1 Answer
Mar 25, 2017

Here's what I get.

Explanation:

The formula for sodium sulfate is shown below.

www.lookchem.com

Here are the strongest intra- and intermolecular forces present in the crystal.

Intramolecular forces

1. Covalent bonds

(a) #"S-O""# bonds in sulfate ion.
(b) #"O-H"# bonds in water

Intermolecular attractions

2. Strong electrostatic attractions

(c) Ion-ion attractions between #"Na"^"+"# and #"SO"_4^"2-"#

3. Weaker electrostatic attractions

(d) Ion-dipole attractions between #"Na"^"+"# and #""^"δ-""O-H"^"δ+"# bond dipoles in water

(e) Ion-dipole attractions between #"SO"_4^"2-"# and #""^"δ+""H-O"^"δ-"# bond dipoles in water

(f) Hydrogen bonds between water molecules: #"H-"stackrelcolor(blue)(δ^"-")("O")"···"stackrelcolor(blue)(δ^"+")("H")#