Chemical calculations theory. Dissolutions

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

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IN CHEMICAL UNITS

-Normality, N (number of gram-equivalents of solute contained in 1 liter of dissolution):

Bioprofe |Exams with exercises about physics, chemistry and mathematics |Chemical calculations theory: Dissolutions

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-Molarity, M (number of moles of solute contained in 1 liter of solution):

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

dissolution).

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

 

-Molality, m (moles of solute number contained in 1 kg of solvent):

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

 

COLLEGATIVE PROPERTIES OF DISSOLUTIONS

Decrease in vapor pressure. Henry’s Law:

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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.

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∆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.

 

 

 

 

You can download the App BioProfe READER to practice this theory with self-corrected exercises.

 

 

Books that we recommend to extend knowledge of the subject

1 Comment

  • Great post! Have nice day ! 🙂 db386

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