Page 9 - E-Book Perhitungan Larutan Penyangga
P. 9
Tahap 4: Membimbing Kelompok dalam Bekerja
Secara berkelompok, Jawablah pertanyaan-pertanyaan berikut ini dengan tepat!
1. Hitunglah pH larutan yang terbentuk antara:
a) 100 mL larutan HCN 0,1 M & 50 mL larutan NaCN 0,2 M; Ka HCN = 4 x10
-5
b) 100 mL NH4OH 0,1 M & 100 mL larutan NH4Cl 0,1 M; Kb NH4OH =1 x10
-5
c) 200 mL larutan HNO2 0,15 M & 150 mL larutan KOH 0,10 M; Ka HNO2 1 x10
-5
d) 200 mL NH4OH 0,1 M & 100 mL larutan HCl 0,1 M; Kb NH4OH =10
-5
e) 50 mL NH4OH 0,2 M & 100 mL larutan HCl 0,05 M; Kb NH4OH =10
-5
f) 200 mL NH4OH 0,1 M & 100 mL larutan NH4Cl 0,1 M; Kb NH4OH =1 x10
-5
-5
g) 10mL H2SO4 0,1 M & 40 mL NH4OH 0,1 M; Kb NH4OH =2 x10
h) 150 mL NH4OH 0,2 M & 200 mL larutan HCl 0,05 M; Kb NH4OH = 10
-5
2. Hitunglah pH larutan yang terbentuk antara 0,1 mol NH4OH & 0,05 mol NH4Cl dengan nilai
Kb NH4OH = 10
-5
3. Berapakah pH campuran antara 100 mL NH4OH 0,3 M dengan 50 mL HBr 0,1 M? Kb
NH 4OH = 10 -5
4. Hitunglah pH antara 150 mL NH4OH 0,20 M dengan 100 mL larutan HCl 0,15 M! Kb NH4OH
= 10 -5
5. Berapakah volume larutan CH3COOH 0,1 M yang harus ditambahkan ke dalam 10 mL
larutan NaOH 0,1 M sehingga diperoleh campuran larutan penyangga dengan pH = 5? (Ka
CH3COOH = 1 x10 )
-5
JAWABAN
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SMA Negeri 1 Waru Sidoarjo - Tahun Pelajaran 2022/2023 8
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