University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2022
Views:

224

Pages:

20
Author:

palangresq3v

SOLUTIONS OF ELECTROLYTES Solutions of Electrolytes Substances that give ions upon electrolysis = Electrolytes Electrolysis: The flow of +ve & -ve ions towards electrodes after application of an electrical energy to produce non-spontaneous reaction. ► Electrolytes classified as strong & weak. Strong electrolytes (By Debye & Huckel): Completely dissociated into free ions. However, later on they were defined as: Strong electrolytes may be completely ionized, but might not be completely dissociated. the solution that contain lons is capable of conducting a current mel Conductance: cations conductance Cell Easiness of current passage through a conductors Measured by (Ohm) 1 (reciprocal ohm) is conductance Resistance of current passage Specific conductance (k) = (i.e. reciprocal of specific resistance) It is a conductance of 1 cm³ of solution (for 10 cm³ we divide by 10) the conductance of 10 ml, is 5 (phim). Find the conductumce conductorca = 5 10 2 0.504 Equivalent Conductance (λ) It is the conductance of a solution of sufficient volume to contain one gram equivalent weight (GEW) of solute 3 ►Ac: Eq. Conductance at certain concentration. Ac = k * V where K= specific conductance 1 Example Calculate the mean ionic activity of a 0.01 M solution of FeCl3? Initial come strong electrolyte Solution: a pm= gamma plus/minus (CCC) ^ (1/(m + n)) where C + = mC C = nC = gamma plus/minus [(0.01) * (3 * 0.01) ^ 3] ^ (1/4) A^ pm = (2.3 * 10 ^ - 2) * Y pm M Ionic Strength levis and Randle to nolate inter renic internets ad ► it represents the contribution of the electrostatic forces of the ions of all the types. M. Ionic strength, and is given using Lewis rule: of each mic operes depends on the total number & fonte charges Not on the specifice proparites of salt presentin Solution underline [ hat M ] I = 1/2 sum C i , underline Z i ^ 2 Y valency ► The ionic strength of 1:1 electrolyte such as KCI is the same as the molar concentration; M of a 1:2 electrolyte such as N*a_{2}*S*O_{4} is three times the concentration; and 2:2 electrolyte is four times the concentration.