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Hitung titik didih dan titik beku larutan glikol 20% berdasarkan massa. ( glikol = 62; air = ; dan air = )

Hitung titik didih dan titik beku larutan glikol 20% berdasarkan massa. (begin mathsize 14px style italic M subscript r end style glikol = 62; begin mathsize 14px style K subscript b end style air = begin mathsize 14px style 0 comma 52 space degree C space m to the power of negative sign 1 end exponent end style; dan begin mathsize 14px style K subscript f end style air = begin mathsize 14px style 1 comma 86 space degree C space m to the power of negative sign 1 end exponent end style

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Jawaban:

Misalkan, terdapat 100 gram larutan glikol 20%,


begin mathsize 14px style m subscript glikol equals 20 percent sign cross times 100 space g equals 20 space g m subscript air equals 100 space g minus sign 20 space g equals 80 space g space end style 


Titik didih larutan glikol 20%,


begin mathsize 14px style space space space space space increment T subscript b double bond m middle dot K subscript b T subscript b bond T subscript b degree equals m subscript glikol over italic M subscript r space glikol end subscript cross times 1000 over m subscript air cross times K subscript b T subscript b minus sign 100 equals 20 over 62 cross times 1000 over 80 cross times 0 comma 52 T subscript b minus sign 100 equals 2 comma 1 space space space space space space space space space space T subscript b equals 102 comma 1 space degree C end style 


Titik beku larutan glikol 20%,


begin mathsize 14px style space space space space space increment T subscript f double bond m middle dot K subscript f T subscript f degree minus sign T subscript f equals m subscript glikol over italic M subscript r space glikol end subscript cross times 1000 over m subscript air cross times K subscript f 0 minus sign T subscript f equals 20 over 62 cross times 1000 over 100 cross times 1 comma 86 0 minus sign T subscript f equals 7 comma 5 space space space space space space space space space space T subscript f equals minus sign 7 comma 5 space degree C end style 


Jadi, titik didih dan titik beku larutan glikol 20% masing-masing adalah begin mathsize 14px style 102 comma 1 space degree C end style dan begin mathsize 14px style negative sign 7 comma 5 space degree C end style

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