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Pertanyaan

Tentukan titik didih dan titik beku, dari: a. Natrium klorida 11,7 gram yang dilarutkan dalam 720 gram air. b. Barium hidroksida 100 gram yang dilarutkan dalam 250 gram air.

Tentukan titik didih dan titik beku, dari:

a. Natrium klorida 11,7 gram yang dilarutkan dalam 720 gram air.

b. Barium hidroksida 100 gram yang dilarutkan dalam 250 gram air.

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E. Dwihermiati

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

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Pembahasan

a) NaCl dalam air b) Barium hidroksida dalam air

a) NaCl dalam air

  table attributes columnalign right center left columnspacing 0px end attributes row cell m space end cell equals cell space gram over Mr space x fraction numerator space 1000 over denominator massa subscript pel end fraction end cell row blank equals cell space fraction numerator 11 comma 7 over denominator 58 end fraction x space 1000 over 720 space end cell row blank equals cell space 0 comma 20 space x space 1 comma 38 space end cell row blank equals cell space 0 comma 28 space molal space end cell row blank blank blank row cell space ΔTb space end cell equals cell space m space x space Kb cross times i end cell row blank equals cell space 0 comma 28 space x space 0 comma 52 cross times 2 end cell row blank equals cell space 0 comma 291 degree C space space end cell row blank blank blank row cell Tb space end cell equals cell space Tb degree space plus space ΔTb space end cell row blank equals cell space 100 space plus space 0 comma 291 end cell row blank equals cell space 100 comma 291 degree C space space end cell row blank blank blank row cell ΔTf space end cell equals cell space m space x space Kf space cross times i end cell row blank equals cell space 0 comma 28 space x space 1 comma 86 space cross times 2 end cell row blank equals cell space 1 comma 042 degree C space end cell row blank blank blank row cell space Tf space end cell equals cell space Tf degree space minus sign space ΔTf space end cell row blank equals cell space 0 space minus sign space 1 comma 042 space end cell row blank equals cell space minus sign space 1 comma 042 degree C end cell end table 

b) Barium hidroksida dalam air

table attributes columnalign right center left columnspacing 0px end attributes row cell m space end cell equals cell space gram over Mr space x fraction numerator space 1000 over denominator massa subscript pel end fraction end cell row blank equals cell space fraction numerator 100 over denominator 171 comma 3 end fraction x space 1000 over 250 space space end cell row blank equals cell 2 comma 34 space molal space end cell row blank blank blank row cell space ΔTb space end cell equals cell space m space x space Kb space cross times i end cell row blank equals cell space 2 comma 34 space x space 0 comma 52 space cross times 3 end cell row blank equals cell space 3 comma 65 degree C space space end cell row blank blank blank row cell Tb space end cell equals cell space Tb degree space plus space ΔTb space end cell row blank equals cell space 100 space plus space 3 comma 65 space end cell row blank equals cell space 103 comma 65 degree C space space end cell row blank blank blank row cell ΔTf space end cell equals cell space m space x space Kf space cross times i end cell row blank equals cell 2 comma 34 space x space 1 comma 86 space cross times 3 end cell row blank equals cell space 13 comma 05 degree C space end cell row blank blank blank row cell space Tf space end cell equals cell space Tf degree space minus sign space ΔTf space end cell row blank equals cell space 0 space minus sign 13 comma 05 space end cell row blank equals cell space minus sign space 13 comma 05 degree C end cell end table 

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