Treatment of the residue with excess naoh

Reference no: EM13933497

The term "ALUM" refers to a class of compounds of general formula QZ(SO₄)2•12H₂O where Q and Z are two different metals. A 25.00 g sample of a certain alum is heated to drive off the crystal water; the anhydrous residue weighs 14.264 g. Treatment of the residue with excess NaOH precipitates all the Z as Z(OH)₃ which weighs 5.355 g. Identify the two metals.

A. K and Al B. Na and Al C. K and Cr D. K and Fe

Reference no: EM13933497

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