Hg⁺ is a softer acid than Li⁺, I⁻ is a softer base than F⁻

HgI + LiF

K < 1

HgF + LiI

Tl⁺ is a softer acid than Na⁺, H⁻ is a soft base

TlH + Na+

K < 1

Tl+ + NaH

Cu(0) is a soft acid, SOMe₂ is a softer base than OSMe₂

Cu(SOMe2)

K < 1

Cu(OSMe2)

Fe²⁺ is a hard acid, bipy (N) is a harder base than dppe (P)

[Fe(dppe)3]2+ + 3 bipy

K > 1

[Fe(bipy)3]2+ + 3 dppe

I₂ is a softer acid than K⁺, I⁻ is a soft base

KI + I2

K > 1

K+ + I3−

BBr₃ is a softer acid than BF₃, PMe₃ is a softer base than NMe₃

Me3PBBr3 + Me3NBF3

K < 1

Me3PBF3 + Me3NBBr3

MeHg⁺ is a softer acid than H⁺, Br⁻ is a softer base than Cl⁻

MeHgBr + HCl

K < 1

MeHgCl + HBr

Ag⁺ is a soft acid, CN⁻ is a softer base than Cl⁻

AgCl2− + 2 CN−

K > 1

Ag(CN)2− + 2 Cl−

Tl⁺ is a softer acid than Na⁺, I⁻ is a softer base than F⁻

NaI + TlF

K > 1

NaF + TlI

Hg²⁺ is a softer acid than Zn²⁺, S²⁻ is a softer base than ²⁻

HgS + ZnO

K < 1

HgO + ZnS

Cr³⁺ is a hard acid, NCS⁻ is a harder base than SCN⁻

Cr(SCN)3

K > 1

Cr(NCS)3

Pd²⁺ is a softer acid than Mn²⁺, dppe (P) is a softer base than en (N)

[Mn(dppe)3]2+ + [Pd(en)3]2+

K > 1

[Mn(en)3]2+ + [Pd(dppe)3]2+

H⁺ is a hard acid, F⁻ is a harder acid than I⁻

HF + I−

K < 1

F− + HI

Au⁺ is a softer acid than Li⁺, Br⁻ is a softer base than Cl⁻

LiBr + AuCl

K > 1

LiCl + AuBr

Mn⁷⁺ is a hard acid, OH⁻ is a harder base than SH⁻

Mn(SH)43+ + 4 OH−

K > 1

Mn(OH)43+ + 4 SH−

Al³⁺ is a hard acid, acac⁻ (O) is a harder base than dppe (P)

Al(acac)3 + 3 dppe

K < 1

[Al(dppe)3]3+ + 3 acac−

BH₃ is a softer acid than BF₃, H⁻ is a soft base

F3BH− + BH3

K > 1

BH4− + BF3

Hg²⁺ is a softer acid than Mn²⁺, SH⁻ is a softer base than OH⁻

Hg(OH)2 + Mn(SH)2

K > 1

Hg(SH)2 + Mn(OH)2

Cr⁶⁺ is a harder acid than W⁶⁺, ox²⁻ is a hard base

Cr(ox)3 + W6+

K < 1

Cr6+ + W(ox)3

Co²⁺ is a softer acid than Co³⁺, CN⁻ is a soft base

Co(CN)64− + Co3+

K < 1

Co(CN)63− + Co2+

Na⁺ is a softer acid than Li⁺, Br⁻ is a softer base than Cl⁻

NaBr + LiCl

K < 1

NaCl + LiBr

Fe³⁺ is a harder acid than Fe²⁺, acac⁻ is a hard acid

Fe(acac)3 + Fe2+

K < 1

[Fe(acac)3]− + Fe3+

Mg²⁺ is a harder acid than Ca²⁺, CO₃²⁻ is a hard base

MgCO3 + Ca2+

K < 1

Mg2+ + CaCO3

Fe³⁺ is a hard acid, O²⁻ is a harder base than S²⁻

Fe2O3 + 3 S2−

K < 1

Fe2S3 + 3 O2−

BF₃ is a hard acid, NMe₃ is a harder base than PMe₃

Me3P−BF3 + NMe3

K > 1

Me3N−BF3 + PMe3

Hg²⁺ is a soft acid, SCN⁻ is a softer base than NCS⁻

Hg(NCS)2

K > 1

Hg(SCN)2

Ni(0) is a softer acid than Ni²⁺, CO is a soft base

Ni(CO)4

K < 1

Ni(CO)42+

Au³⁺ is a soft acid, S²⁻ is a softer base than O²⁻

Au2O3 + 3 S2−

K > 1

Au2S3 + 3 O2−

Ca²⁺ is a softer acid than Mg²⁺,

MgF2 + CaBr2

K < 1

MgBr2 + CaF2

Ni(0) is a soft acid, CO is a softer base than H₂O

Ni(CO)4 + 4 H2O

K < 1

Ni(H2O)4 + 4 CO