# Dissolutions

Dissolutions are homogeneous mixtures resulting from the interposition of atoms, molecules or ions from two or more substances, called components, which are involved in varying proportions.

WAYS TO EXPRESS THE CONCENTRATION OF DISSOLUTIONS

IN PHYSICAL UNITS Bioprofe |Chemical calculations theory: Dissolutions| 01

IN CHEMICAL UNITS

-Normality, N (number of gram-equivalents of solute contained in 1 liter of dissolution): Bioprofe |Chemical calculations theory: disolutions| 02

-Molarity, M (number of moles of solute contained in 1 liter of solution): Bioprofe |Chemical calculations theory: disolutions| 03

(a = grams of solute; val = valence of solute; M = molecular mass of solute; V = volume (cm³) of

dissolution). Bioprofe |Chemical calculations theory: disolutions| 04

(V = volume of dissolution in liters; N = normality).

-Molality, m (moles of solute number contained in 1 kg of solvent): Bioprofe |Chemical calculations theory: disolutions| 05

(a = grams of solute; M = molecular mass of solute; m’= grams of dissolvent).

COLLEGATIVE PROPERTIES OF DISSOLUTIONS

Decrease in vapor pressure. Henry’s Law: Bioprofe |Chemical calculations theory: disolutions| 06

Po = vapor preassure of pure dissolvent.

P = vapor preassure of the dissolution

Xsol =molar fraction of solute.

Xd = molar fraction of dissolvent.

Freezing-point depression and boiling point rise. Raoult´s law. Bioprofe |Chemical calculations theory: disolutions| 07

∆t = increase the ebullioscopic point or decline the cryoscopic point.

K = molal constant boiling or freezing

m = molality of the dissolution

a = g of solute by kg of dissolvent.

M = molecular mass of solute.

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#### 1 Comment

• Great post! Have nice day ! 🙂 db386

Thomas Reply