lks penurunan titik beku
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7/25/2019 LKS Penurunan Titik Beku
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PENURUNAN TITIK BEKU
Hari, Tanggal :
Waktu : 30 menit
Nama : .........................
Kelas : .........................
LEMBAR KERJA SISWA
KELOMPOK :
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A. Indikator
1. Menjelaskan prosedur percobaan penurunan titik beku elektrolit dan non
elektrolit
2. Menghitung selisih Titik Beku Air dengan Titik Beku Larutan ∆ T! " dan molalitas larutan
#. Menjelaskan pengaruh penambahan $at terlarut tehadap penurunan titik beku
%. Menjelaskan pengaruh larutan elektrolit dengan non elektrolit terhadap titik beku
larutan dan penurunan titik beku larutan
&. Menjelaskan pen'ebab adan'a penurunan titik beku pada larutan
(. Men'impulkan hasil diskusi mengenai penurunan titik beku larutan elektrolit dan
non elektrolit
B. Tujuan Pembelajaran
1. )is*a dapat menjelaskan prosedur percobaan penurunan titik beku elektrolit dan
non elektrolit2. )is*a dapat menghitung selisih Titik Beku Air dengan Titik Beku Larutan ∆ T! " dan
molalitas larutan
#. )is*a dapat menjelaskan pengaruh penambahan $at terlarut tehadap penurunan
titik beku
%. )is*a dapat menjelaskan pengaruh larutan elektrolit dengan non elektrolit
terhadap titik beku larutan dan penurunan titik beku larutan
&. )is*a dapat menjelaskan pen'ebab adan'a penurunan titik beku pada larutan
(. )is*a dapat men'impulkan hasil diskusi mengenai penurunan titik beku larutan
elektrolit dan non elektrolit
Berdasarkan video perobaan
penurunan titik beku !ang tela" andaamati, berikan ja#aban untuk
beberapa pertan!aan berikut.
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1. Bagaimana prosedur percobaan penurunan titik beku elektrolit dan non elektrolit+
Jawab
2. ,silah tabel berikut ini -
iketahui :
a) /T! a0uades /T! air /T! larutan
N
o.Larutan Titik Beku
$elisi" Titik Beku Air
dengan Titik Beku
%arutan &
T' (
Molalitas
1. Air (Es) 00C 00C 0
2. Urea
3. NaCl
ΔTf = ΔTf air – ΔTf larutan
Kf = 1, ! 0C " #
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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3itunglah :
7/25/2019 LKS Penurunan Titik Beku
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/T! urea .....................................
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/T! Na4l .......................................
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%) /T! a0uades 554
/T! a0uades ...........67........
ma0uades 7.....................
/T! 8rea 7...................
/T! 8rea .......................
murea .......................
/T! Na4l .......................
/T! Na4l .......................
m Na4l .......................
#. Bagaimana pengaruh penambahan $at terlarut urea" tehadap penurunan titik beku+
Jawab
%. Berdasarkan molalitas tersebut9 bagaimanakah pengaruh urea non elektrolit"dibanding dengan pengaruh Na4l elektrolit" terhadap titik beku larutan dan
penurunan titik beku larutan- elaskan-
Jawab
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&. Mengapa terjadi penurunan titik beku + hubungkan dengan penurunan tekanan uap
Larutan"
Jawab
(. Kesimpulan apa 'ang dapat ditarik mengenai penurunan titik beku larutan elektrolit
dan non elektrolit+
Jawab
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Berdasarkan hasil diskusi dapat disimpulkan bah*a :
penurunan titik beku adalah selisih.............................................................
dengan ...........................................................................................................................
...........................
)ecara matematis dituliskan :
;T! ....... < .........
penurunan titik beku suatu larutan disebabkan oleh penurunan tekanan uap9
sehingga larutan pada...............karena..................9 untuk mencapai tekanan uap 1
atm maka perlu didinginkan lagi agar mencapai titik bekun'a akibatn'a
titik........................ Adan'a $at terlarut dalam suatu larutan dapat .............................
titik beku larutan. 3al tersebut disebabkan.........................'ang dimiliki
larutan......................daripada...................murnin'a.
Berdasarkan =ideo percobaan9 bah*a *aktu untuk .........................nonelektrolit
mencapai..............lebih...........dibanding.................elektrolit9 karena
jumlah........................lebih ban'ak dibanding................nonelektrolit.
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