What is the activity coefficient for each ion at the given ionic strength? Click

Question

What is the activity coefficient for each ion at the given ionic strength? Click here for an activity coefficient table.

a) Hg22+ ( = 0.1 M)

b) Y3+ ( = 0.1 M)

c) Eu3+ ( = 0.01 M)

d) (CH3CH2)3NH+ ( = 0.005 M)

Activity Coefficients

Pb2+, CO32-, SO32-, MoO42-, Co(NH3)5Cl2+, Fe(CN)5NO2-, C2O42-, Hcitrate2-

for Aqueous Solutions at 25°C
Ion Ionic Strength(,M) Ion size
(,pm) 0.001 0.005 0.01 0.05 0.1 Charge= +/-1 Activity coefficient () H+ 900 0.967 0.933 0.914 0.86 0.83 (C6H5)2CHCO2-, (C3H7)4N+ 800 0.966 0.931 0.912 0.85 0.82 (O2N)3C6H2O-,(C3H7)NH+,CH3O6H4CO2- 700 0.965 0.930 0.909 0.845 0.81 Li+,C6H5CO2-, HOC6H4CO2-, ClC6H4CO2-, C6H5CH2CO2, CH2=CHCH2CO2-,(CH3)2CHCH2CO2-, (CH3CH2)4N+, (C3H7)2NH2+   600 0.965 0.929 0.907 0.835 0.80 Cl2CHCO2-, Cl3CCO2, (CH3CH2)3NH+, (C3H7)NH3+ 500 0.964 0.928 0.904 0.83 0.79 Na+, CdCl+, ClO2-, IO3-, HCO3-, H2PO4-, HSO3-, H2AsO4-, Co(NH3)4(NO2)2+, CH3CO2-, ClCH2CO2-, (CH3)4N+, (CH3CH2)2NH2+, H2NCH2CO2- 450 0.964 0.928 0.902 0.82 0.775 +H3NCH2CO2H,(CH3)3NH+, CH3CH2NH3+ 400 0.964 0.927 0.901 0.815 0.77 OH-, F-, SCN-, OCN-, HS-, ClO3-, ClO4-, BrO3-, IO4-, MnO4-, HCO2-, H2citrate-, CH3NH3+, (CH3)2NH2+ 350 0.964 0.926 0.900 0.81 0.76 K+, Cl-, Br-, I-, CN-, NO2-, NO3- 300 0.964 0.925 0.899 0.805 0.755 Rb+, Cs+, NH4+, Tl+, Ag+ 250 0.964 0.924 0.898 0.80 0.75 Charge= +/-2 Activity coefficient () Mg2+, Be2+ 800 0.872 0.755 0.69 0.52 0.45 CH2(CH2CH2CO2-)2, (CH2CH2CH2CO2-)2 700 0.872 0.755 0.685 0.50 0.425 Ca2+, Cu2+, Zn2+, Sn2+, Mn2+, Fe+2, Ni2+, Co+2, C6H4(CO2-)2, H2C(CH2CO2-)2, (CH2CH2CO2-)2 600 0.870 0.749 0.675 0.485 0.405 Sr2+, Ba2+, Cd2+, Hg2+, S2-, S2O42-, WO42-, H2C(CO2-)2, (CH2CO2-)2, (CHOHCO2-)2 500 0.868 0.744 0.67 0.465 0.38

Pb2+, CO32-, SO32-, MoO42-, Co(NH3)5Cl2+, Fe(CN)5NO2-, C2O42-, Hcitrate2-

450 0.867 0.742 0.665 0.455 0.37 Hg22+, SO42-, S2O32-, S2O62-, S2O82-, SeO42-, CrO42-, HPO42- 400 0.867 0.740 0.660 0.445 0.355 Charge= +/- 3 Activity coefficient () Al3+, Fe3+, Cr3+, Sc3+, Y3+, In3+, lanthanidesa 900 0.738 0.54 0.445 0.245 0.18 citrate3- 500 0.728 0.51 0.405 0.18 0.115 PO43-, Fe(CN)63-, Cr(NH3)63+, Co(NH3)63+, Co(NH3)5H2O3+ 400 0.725 0.505 0.395 0.16 0.095 Charge = +/- 4 Activity coefficient () Th4+, Zr4+, Ce4+, Sn4+ 1100 0.588 0.35 0.255 0.10 0.065 Fe(CN)64- 500 0.57 0.31 0.20 0.048 0.021

Explanation / Answer

(a) Activity coefficient of Hg2^2+ at u = 0.1 M is 0.355

(b) Activity coefficient of Y3+ at u = 0.1 M is 0.18

(c) Activity coefficient of Eu3+ at u = 0.1 M is 0.445

(d) Activity coefficient of ( CH3CH2)3NH+ at u = 0.005 M is 0.928

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