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Sebanyak 2 gram  dilarutkan dalam 1000 gram air te...

Sebanyak 2 gram begin mathsize 14px style Mg Cl subscript 2 end style dilarutkan dalam 1000 gram air ternyata membeku pada suhu begin mathsize 14px style negative sign 0 comma 115 space degree C end style (begin mathsize 14px style K subscript f end style air = 1,86, Ar Mg = 24, Cl = 35,5). Tentukan derajat ionisasi begin mathsize 14px style Mg Cl subscript bold 2 end style!

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Jawaban:

Langkah 1 Menentukan begin mathsize 14px style increment T subscript f end style (penurunan titik beku) begin mathsize 14px style Mg Cl subscript 2 end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment T subscript f end cell equals cell T subscript f pelarut bond T subscript f larutan end cell row blank equals cell 0 degree C minus sign left parenthesis minus sign 0.115 degree C right parenthesis end cell row blank equals cell 0 comma 115 degree C end cell end table end style


Langakah 2 Menentukan molalitas (m) begin mathsize 14px style Mg Cl subscript 2 end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row m equals cell m over Mr cross times 1000 over p end cell row blank equals cell 2 over 95 cross times 1000 over 1000 end cell row blank equals cell 0 comma 021 space molal end cell end table end style 


Langkah 3 menentukan faktor Van't Hoff

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment T subscript f end cell equals cell m cross times K subscript f cross times i end cell row cell 0 comma 115 degree C end cell equals cell 0 comma 021 space molal cross times 1 comma 86 cross times i end cell row i equals cell fraction numerator 0 comma 115 degree C over denominator 0 comma 021 space molal cross times 1 comma 86 end fraction end cell row blank equals cell 2 comma 94 end cell end table end style 


Langkah 4 menentukan derajat ionisasi undefined

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row i equals cell 1 plus left parenthesis n minus sign 1 right parenthesis alpha end cell row cell 2 comma 94 end cell equals cell 1 plus left parenthesis 3 minus sign 1 right parenthesis alpha end cell row blank equals cell 1 plus 2 alpha end cell row cell 2 alpha end cell equals cell 2 comma 94 minus sign 1 end cell row cell 2 alpha end cell equals cell 1 comma 94 end cell row alpha equals cell 0 comma 97 end cell end table end style 


Berdasarkan perhitungan tersebut, maka derajat ionisasi undefined adalah 0,97

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