Potentiometrical Judgement of the Complex of Metal Hydroxides Formed in Mixed Metal Nitrate Solutions with Addition of Alkali
1995 Volume 1995 Issue 6 Pages 426-431
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1995 Volume 1995 Issue 6 Pages 426-431
Potentiometric titration method was applied to judge whether precipitated hydroxide is a complex hydroxide or a mixture when alkali solution was added to an aqueous solution containing two kinds of metal salts (Al3+, Fe3+, Ni2+, Zn2+, Cu2+). Capability of complex formation between the metal hydroxides was investigated by comparing the pH of the plateau in the titration curves with that for the solution of one kind of metal ion. Complex was formed for all of the combination between divalent ion and trivalent ions, and the sequence of the capability was Ni2+ > Zn2+ > Cu2+, In the case of divalentdivalent systems, complex was formed in the solution of Ni( NO3)2 -Zn(NO3)2, but Cu(NO3)2 -Zn(NO3)2and Cu(NO3)2-Ni(NO3)2 systems formed only mixtures.
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