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I would really appreciate it if you could help me out with question 1 b).
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Answer #1

Answer)

Radius ratio rule

radius ratio = radius of cation/radius of anion

Radius ratio rule says if radius ratio is

Coordination Example Radius Ratio Type of void number <0.155 Linear 0.155-0.225 3 Triangular Planar В,0, Tetrahedral 4 ZnS, CuCl 0.225-0.414 Octahedral 6 NaCl, MgO 0.414-0.732 0.732-1.000 Cubic CsCl, NH,Br Close packing (ccp and hcp) metals 1 12

...

b)

radius ratio for Na+ ion with Cl-, F- and Br-

With Cl-

radius ratio = 1.04/1.72 = 0.605

With F-

radius ratio = 1.04/1.53 =0.679

With Br-

radius ratio = 1.04/1.82 = 0.571

In this case radius ratio comes under 0.414-0.732 category so it will fit in octahedral void

radius ratio for K+ ion with Cl-, F- and Br-

With Cl-

radius ratio = 1.34/1.72 = 0.779

With F-

radius ratio = 1.34/1.53 =0.875

With Br-

radius ratio = 1.34/1.82 = 0.736

In this case radius ratio comes under 0.732-1.00 category so it will fit in cubic void

radius ratio for Li+ ion with Cl-, F- and Br-

With Cl-

radius ratio = 0.635/1.72 = 0.369

With F-

radius ratio = 0.635/1.53 =0.415

With Br-

radius ratio = 0.635/1.82 = 0.348

In this case radius ratio comes under 0.225-0.414 category so it will fit in tetrahedral void

................

Na+ will fit in Octahedral void and Li+ will fit in tetrahedral void..............

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Answer 1

Answer)

Radius ratio rule

radius ratio = radius of cation/radius of anion

Radius ratio rule says if radius ratio is

Coordination Example Radius Ratio Type of void number <0.155 Linear 0.155-0.225 3 Triangular Planar В,0, Tetrahedral 4 ZnS, CuCl 0.225-0.414 Octahedral 6 NaCl, MgO 0.414-0.732 0.732-1.000 Cubic CsCl, NH,Br Close packing (ccp and hcp) metals 1 12

...

b)

radius ratio for Na+ ion with Cl-, F- and Br-

With Cl-

radius ratio = 1.04/1.72 = 0.605

With F-

radius ratio = 1.04/1.53 =0.679

With Br-

radius ratio = 1.04/1.82 = 0.571

In this case radius ratio comes under 0.414-0.732 category so it will fit in octahedral void

radius ratio for K+ ion with Cl-, F- and Br-

With Cl-

radius ratio = 1.34/1.72 = 0.779

With F-

radius ratio = 1.34/1.53 =0.875

With Br-

radius ratio = 1.34/1.82 = 0.736

In this case radius ratio comes under 0.732-1.00 category so it will fit in cubic void

radius ratio for Li+ ion with Cl-, F- and Br-

With Cl-

radius ratio = 0.635/1.72 = 0.369

With F-

radius ratio = 0.635/1.53 =0.415

With Br-

radius ratio = 0.635/1.82 = 0.348

In this case radius ratio comes under 0.225-0.414 category so it will fit in tetrahedral void

................

Na+ will fit in Octahedral void and Li+ will fit in tetrahedral void..............