8-4. Find the activity coefficient of each ion at the indicated ionic strength:
(a)
(μ = 0.01 M)
3+
(b) Sc
(μ = 0.005 M)
3+
(c) Eu
(μ = 0.1 M)
+
(d) (CH3CH2)3NH (μ = 0.05 M)
8-6. Calculate the activity coefficient of Zn
2+
when μ = 0.083 M by using (a) Equation 8-6; (b) linear interpolation in Table 8-1.
+
−
2+
8-17. Write a charge balance for a solution containing H , OH , Ca ,
+
,
+
+
, Ca(HCO3) , Ca(OH) , K , and
.
8-18. Write a charge balance for a solution of H2SO4 in water if the H2SO4 ionizes to
and
.
8-19. Write the charge balance for an aqueous solution of arsenic acid, H3AsO4, in which the acid can dissociate to
,
and
structure of
. Look up the structure of arsenic acid in Appendix G and write the
.
2+
−
+
+
8-20. (a) Write the charge and mass balances for a solution made by dissolving MgBr 2 to give Mg , Br , MgBr , and MgOH .
3+
2+
8-24. Write a mass balance for a solution of Fe2(SO4)3 if the species are Fe , Fe(OH) ,
,
,
−
, and HSO 4.
,