Page 10 - UKBM TAMBAH COVER

KIM – 3.1/4.1/5/1.1

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3. Hitung massa glukosa (C6H12O6, Mr = 180) yang harus dilarutkan dalam 1 kg air, agar

didapat larutan yang membeku pada  0,372 oC (Kf air = 1,86 oC/m).
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4. Tentukan massa etanol (C2H5OH) yang harus dilarutkan dalam 400 gram air, agar

diperoleh larutan etanol yang titik bekunya -5 C, jika diketahui Kf air=1,86, Ar C=12,
O=16 dan H=1
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5. Tentukan titik beku larutan yang dibuat dengan melarutkan 15 gram Urea (CO(NH2)2)

dalam ½ kg air, jika diketahui Kf air=1,86 dan Ar C=12, O=16, N=14 dan H=1
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Kegiatan Belajar 4

1. Bacalah teks tentang “ Sifat koligatif larutan” dalam buku teks pelajaran (BTP) Kimia Kelas

XII halaman 15 s.d. 16
2. Kemudian, jawablah pertanyaan – pertanyaan berikut !
No. Pertanyaan Jawaban

1. Berdasarkan pengertian sifat koligatif

larutan, kaitkan hubungan jumlah zat terlarut
dengan tekanan osmosis larutan dengan

benar!
2. Gambarkan bagaimana hubungan antara

besarnya molalitas larutan terhadap tekanan
osmosis larutan?

3. Dua orang siswa melakukan praktikum
tentang “penurunan titik beku larutan”.
Kedua siswa tersebut menggunakan teknik

yang sama persis dalam praktikumnya. Yang