Upload
ayu-p-larasati
View
421
Download
15
Embed Size (px)
Citation preview
7/25/2019 LKS Penurunan Titik Beku
http://slidepdf.com/reader/full/lks-penurunan-titik-beku 1/6
PENURUNAN TITIK BEKU
Hari, Tanggal :
Waktu : 30 menit
Nama : .........................
Kelas : .........................
LEMBAR KERJA SISWA
KELOMPOK :
7/25/2019 LKS Penurunan Titik Beku
http://slidepdf.com/reader/full/lks-penurunan-titik-beku 2/6
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.
7/25/2019 LKS Penurunan Titik Beku
http://slidepdf.com/reader/full/lks-penurunan-titik-beku 3/6
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 " #
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
3itunglah :
7/25/2019 LKS Penurunan Titik Beku
http://slidepdf.com/reader/full/lks-penurunan-titik-beku 4/6
/T! urea .....................................
....................................
/T! Na4l .......................................
.......................................
%) /T! a0uades 554
/T! a0uades ...........67........
ma0uades 7.....................
/T! 8rea 7...................
/T! 8rea .......................
murea .......................
/T! Na4l .......................
/T! Na4l .......................
m Na4l .......................
#. Bagaimana pengaruh penambahan $at terlarut urea" tehadap penurunan titik beku+
Jawab
%. Berdasarkan molalitas tersebut9 bagaimanakah pengaruh urea non elektrolit"dibanding dengan pengaruh Na4l elektrolit" terhadap titik beku larutan dan
penurunan titik beku larutan- elaskan-
Jawab
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
............................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
............................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
7/25/2019 LKS Penurunan Titik Beku
http://slidepdf.com/reader/full/lks-penurunan-titik-beku 5/6
&. Mengapa terjadi penurunan titik beku + hubungkan dengan penurunan tekanan uap
Larutan"
Jawab
(. Kesimpulan apa 'ang dapat ditarik mengenai penurunan titik beku larutan elektrolit
dan non elektrolit+
Jawab
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
................................................................................................................................
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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.
7/25/2019 LKS Penurunan Titik Beku
http://slidepdf.com/reader/full/lks-penurunan-titik-beku 6/6
Selaat Beker!a...