Modern inorganic chemistry

314

200 r

Enthalpy

(kJmol

-200

-400

-600

-800

-IOOO -

-1200 L

Figure 11.2. Formation of fluoride and chloride iom from the elements

Kev:

+ aq + e~ -> X'(aq)

Table 11.2

ENTHALPY DATA FOR HALiDE ION FORMATION IN AQUEOUS SOLUTION

IX, (s.l
ix 2 (g)
X(g) +
X~(g)-

iX 2 (g)
£^(V)

, g) - JX 2 (g)

-> X(g)

*" -*X-(g)

-^X-(aq)

+ e" -» X^iaq)

F

0

4-79

-333

-515

-769

+ 2,80

Cl

0

+ 121

-364

-381

-624

-f 1 .36

Br

+ 15

4-97

-342

-347

-577

4-1.07

I

+ 31

+ 75

-295

-305

-494

+ 0,54