Strongest ox. agent

Weakest reducing agent

Strongest acid

(pk_A)

Weakest base

F₂

F^-

HCl  (-8)

Cl^-

Au⁺

Au

H₂SO₄ (-3.0, 2.0)

HSO₄^-

MnO₄^-

Mn²⁺

HNO₃ ( )

NO₃^-

Cl₂

Cl^-

H₃O⁺  (-1.7)

H₂O

Cr₂O₇^-

Cr³⁺

H₂C₂O₄ (1.2, 4.2)

HC₂O₄^-

Pt²⁺

Pt

H₂SO₃  (1.9, 7.2)

HSO₃^-

Br₂

Br^-

HSO₄^- (2.0)

SO₄^2-

Hg²⁺

Hg           similar

H₃PO₄ (2.1, 7.2, 12.3)       

H₂PO₄^-

Fe³⁺

Fe²⁺

HNO₂ (3.3)

NO₂^-

I₂

I^-

HF (3.2)

F^-

Cu⁺

Cu

HC₂O₄^- 4.2)

C₂O₄^2-

Cu²⁺

Cu

CH₃CO₂H (4.8)

CH₃CO₂^-

H⁺

H₂

H₂CO₃ (6.4, 10.3)

HCO₃^-

Fe³⁺

Fe

H₂S (7.0)

HS^-

Pb²⁺

Pb         similar

H₂PO₄^- (7.2)

HPO₄^2-

Sn²⁺

Sn          

HSO₃^-  (7.2)       

SO₃^2-

Ni²⁺

Ni

HCN (9.4)

CN^-

Co²⁺

Co

NH₄⁺ (9)

NH₃

Cd²⁺

Cd

HCO₃^- (10.3)

CO₃^2-

Fe²⁺

Fe

HPO₄^2- (12.3)

PO₄^3-

Cr³⁺

Cr

H₂O (15.7)

OH-

Zn²⁺

Zn

Weakest acid

Strongest base

Cr²⁺

Cr

Mn²⁺

Mn

Al³⁺

Al

Mg²⁺

Mg

Na⁺

Na

Ca²⁺

Ca

Sr²⁺

Sr

Ba²⁺

Ba

Rb⁺

Rb

K⁺

K

Li⁺

Li

Weakest ox. ag

Strongest red.ag.