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To increase significantly the concentration of free Zn2+ ion in a solution of the complex ion [Zn(NH3)42+ 

Zn2+ (aq) + 4NH3 (aq)  ⇄ [Zn(NH3)4 ] 2+ (aq) 

add to the solution some : 

(A) H2

(B) HCl (aq) 

(C) NH3 (aq) 

(D) NH4Cl (aq) 

1 Answer

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Best answer

Add to the solution some of HCl (aq).

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