PHYSICAL CHEMISTRY IN BRIEF

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 361 11.3 Electric conductivity of electrolytes Ohm’s law applies in electrolytes just like ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 362 11.3.2 Conductivity cell constant Calculating conductivity from relations (11.23) and ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 363 Solution The first step is to determine the conductivity from relation (11.25) κ= 541 ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 364 Note:The term molar conductivity is often used also for the conductivity related to un ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 365 11.3.7 Concentration dependence of molar conductivity. Molar conductivity usually decr ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 366 11.4 Chemical potential, activity and activity coefficient in electrolyte solutions Th ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 367 11.4.1.2 Undissociated electrolyte. The standard state of unit molar concentration,cst ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 368 11.4.1.3 Ions The same standard states are chosen for ions in a solution as for an und ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 369 Example Let us consider a solution of aluminium sulfate of the molality 0.2 mol kg−^1. ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 370 Example Calculate the ionic strength of a) a solution of FeCl 3 of the molalitym= 0.1 ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 371 whereeis the absolute value of the electron charge,NAis the Avogadro constant, 0 is t ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 372 Solution We first determine the molalities of the ions from the specification and from ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 373 11.5 Dissociation in solutions of weak electrolytes This section is focused on the dis ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 374 where the activity of water is considered to be one. The ionic product of water depend ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 375 Solution By integrating equation (11.50) we obtain lnKw(T) = lnKw(298.15) + ∆rH◦ R ( 1 ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 376 Equation (11.53) can then be written in the form K= α^2 c γ±^2 (1−α)γHA 1 cst , (11.54 ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 377 Note:The dissociation of a weak acid, equation (11.52), may be also written as HA + H ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 378 and in the second stage according to the equation HA−= H++ A^2 −. (11.59) If we denote ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 379 where we assume, in compliance with the Debye-H ̈uckel limiting relation, thatγH+=γHA− ...

CHAP. 11: ELECTROCHEMISTRY [CONTENTS] 380 and A−+ H 2 O = HA + OH−. (11.68) The equilibrium constant of the reaction (11.68) is ...