SOAL PILIHAN GANDA
1. Pasangan larutan berikut ini yang menghasilkan larutan penyangga adalah.... A. 50 mL CH 3COOH 0,1 M + 50 mL NaOH 0,25 M B. 50 mL CH 3COOH 0,1 M + 50 mL NaOH 0,1 M C. 50 mL HCN 0,05 M + 50 mL NaOH 0,05 M D. 50 mL NH4OH 0,1 M + 50 mL HCl 0,05 M E. 50 mL NaOH 0,1 M + 50 mL HCl 0,1 M JAWABAN: D Penyelesaian:
Larutan penyangga dapat berisi campuran asam lemah dengan basa konjugasi atau basa lemah dengan asam konjugasinya. 50 mL NH 4OH 0,1 M + 50 mL HCl 0,05 M –
Mol basa lemah (NH 4OH) = 50 mL x 0,1 M = 5 mmol
–
Mol HCl
= 50 mL x 0,05 M = 2,5 mmol NH4OH
+
HCl
NH4Cl
Mula-mula : 5 mmol
2,5 mmol
-
Bereaksi :
2,5 mmol
2,5 mmol
2,5 mmol
Sisa :
2,5 mmol
-
2,5 mmol
Sehingga yang bersisa adalah adalah basa lemah dan asam konjugasinya.
2. Perhatikan tabel di bawah ini No Larutan
Konsentrasi Konsentrasi (1 M)
Volume (mL)
1
NaOH
0,2
150
2
NaOH
0,2
100
3
HCl
0,1
150
4
HCl
0,1
100
5
CH3COOH
0,2
200
6
NH4OH
0,1
250
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Dari tabel tersebut campuran yang menghasilkan larutan penyangga bersifat asam adalah campuran antara larutan nomor.... A. 1 dan 2
D. 3 dan 4
B. 1 dan 5
E. 4 dan 6
C. 2 dan 5 JAWABAN : C Penyelesaian :
mmol CH3COOH = 0,2 M × 200 mL = 40 mmol mmol NaOH
= 0,2 M × 100 mL = 20 mmol CH3COOH
+
NaOH
CH3COONa
Mula-mula :
40 mmol
20 mmol
-
Bereaksi
:
20 mmol
20 mmol
20 mmol
Sisa
:
20 mmol
-
+ H 2O
20 mmol
Campuran antara tersebut menghasilkan sisa reaksi asam lemah (CH 3COOH) dengan basa konjugasinya (CH 3COONa) atau menghasilkan larutan penyangga asam.
3. Perhatikan percobaan berikut: Larutan
I
II
III
IV
V
4
5
7
8
10
Ditambah sedikit asam
2,5
3,9
4,5
7,8
5
Ditambah sedikit basa
6,6
6,1
10
8,1
12
Ditambah sedikit air
5,2
5,9
6,5
7,6
8,5
pH awal
Dari data tersebut yang termasuk larutan penyangga adalah … A. I B. II C. III
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JAWABAN : D
4. Campuran dibawah ini yang menghasilan system buffer adalah … A. 50 mL NaOH 0,02 M + 50 mL H 2SO4 0,02 M B. 50 mL NaOH 0,01 M + 50 mL CH 3COOH 0,01 M C. 50 mL NH 4OH 0,04 M + 50 mL HCl 0,02 M D. 50 mL NH 4OH 0,02 M + 50 mL HCl 0,02 M E. 50 mL NH 4OH 0,02 M + 50 mL HCl 0,04 M JAWABAN : C Penjelasan :
NH4OH merupakan basa lemah n= n= 2 mmol. HCl merupakan asam kuat n = 1 mmol. Buffer = n AL > n BK , n BL > n AK.
5. Diantara campuran berikut ini yang merupakan larutan penyangga asam yaitu... A. CH3COOH dengan NaOH B. HCl dengan NaOH C. H2SO4 dengan NaOH D. HCN dengan NH 3 E. CH3COOH dengan NH 3 JAWABAN : A Penyelesaian :
Larutan penyangga dihasilkan dari asam lemah berlebih dan basa kuat. CH3COOH adalah asam lemah dan NaOH adalah basa kuat.
6. Campuran larutan di bawah ini yang merupakan campuran buffer adalah …. A. 50 mL HCl 0,5 M + 50 mL NaOH 0,1 M 0,1 M B. 50 mL HCl 0,5 M + 50 mL NH 4CH 0,5 M 0,5 M C. 50 mL HCl 0,5 M + 50 mL NH 4OH 0,1 M 0,1 M D. 50 mL HCl 0,1 M + 50 mL NaOH 0,5 M 0,5 M
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Penyelesaian :
HCl merupakan asam kuat dan NH 4OH merupakan basa lemah. Larutan penyangga dapat dibuat dari basa lemah berlebih dan asam kuat.
7. Penambahan sedikit HCl ke dalam campuran NH 4OH dengan NH 4Cl tidak akan mempengaruhi harga pH, karena.... A. Akan menambah jumlah [H +] B. Akan mengurangi jumlah [OH -] C. [NH4OH] bertambah banyak D. HCl bereaksi dengan NH 4OH E. [NH4Cl] berkurang banyak JAWABAN : D Penyelesaian :
Karena pada larutan penyangga basa jika ditambahkan asam maka akan bereaksi dengan basa lemahnya. Dalam larutan penyangga basa bas a tersebut yang menjadi basa lemah adalah NH 4OH, maka HCl akan bereaksi dengan NH 4OH.
8. Campuran buffer yang dapat mempertahankan p mempertahankan pH H darah dalam tubuh kita adalah …. A. HCN/CN – B. HCl/Cl – C. H2CO3/HCO3 – D. CH3COOH/CH3COO – E. HCOOH/HCCO – JAWABAN : C
9. Diketahui sistem penyangga : a. H2PO4- dan HPO42 b. CH3COOH dan CH 3COO-
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Dari sistem tersebut yang merupakan sistem penyangga dalam tubuh adalah … A. a dan b B. a dan c C. b dan c D. c dan d E. b dan d JAWABAN : B
10.
Perhatikan tabel berikut! Larutan
Perubahan pH setelah ditambah Air
Asam Kuat
Basa Kuat
1
2,84
2,32
13,45
2
2,32
1,70
13,01
3
4,73
4,66
12,52
4
4,75
4,76
4,76
5
4,75
1,45
12,55
Larutan yang memiliki sifat penyangga adalah … A. 1 B. 2 C. 3 D. 4 E. 5 JAWABAN : D
11. Fungsi sistem larutan penyangga dalam darah adalah mempertahankan … A. Derajat keasaman darah B. Kadar Hb darah C. Sel darah merah dari darah D. Fibrinogen
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12. Campuran di bawah ini menghasilkan pH kurang dari 7 adalah … A. Dalam 1 liter air terdapat 0,1 mol NH 3 dari 0,1 mol NH 4C B. 100 mL Ca(OH) 2 0,1 M + 100 mL HCl 0,1 M C. Dalam 1 liter terdapat 0,1 mol CH 3COOH dan 0,1 mol CH 3COONa D. 100 mL NaOH 0,1 M + 100 mL HCl 0,1 M E. 100 mL NaOH 0,2 M + 100 mL CH 3COOH 0,1 M JAWABAN : C
13. Sebanyak 25 mL larutan CH 3COOH 0,2 M dicampurkan dengan 25 mL larutan NaOH 0,1 M, maka harga pH larutan adalah … A. 2,0 B. 2,5 C. 3,0 D. 5,0 E. 5,5 JAWABAN : D
14. 500 mL larutan Na-asetat 0,1 M dicampur dengan 500 mL larutan asam asetat 0,1 M, diketahui Ka asam asetat = 10 -5. Harga pH larutan sama dengan … A. 5 B. 6 C. 7 D. 8 E. 9 JAWABAN : A Penyelesaian Penyelesaian :
Diketahui : V asam asetat
= 500 mL
M asam asetat = 0,1 M V Na-asetat
= 500 mL
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Ditanya: pH
asam asetat merupakan asam lemah n = V. M = 500 mL × 0,1 M = 50 mmol Na-asetat merupakan garam n = V. M = 500 mL × 0,1 M = 50 mmol
[ ]
pH= - log (10-5) = 5
15. Untuk membuat larutan penyangga dengan pH = 4, berapa banyak volume CH3COONa 0,05 M kedalam 100 mL larutan CH 3COOH 0,2 M (Ka = 10 -5)? A. 5 mL B. 10 mL C. 20 mL D. 30 mL E. 40 mL JAWABAN : E Penyelesaian Penyelesaian :
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[ ]
16. Larutan
25 mL CH 3COOH 0,2 M dicampurkan dicampurkan dengan dengan
25 mL larutan
NaOH 0,1 M, maka harga pH penyangga adalah.... (Ka CH 3COOH = 1 x -5
10 ) A. 2,0
C. 3
B. 2,5
D. 5
E. 5,5
JAWABAN : D Penyelesaian :
Diketahui : V CH3COOH
= 25 mL
M CH3COOH = 0,2 M V NaOH
= 25 mL
M NaOH
= 0,1 M -5
Ka CH Ka CH3COOH = 1 x 10 Ditanya
: pH……?
Mol CH3COOH = 25 mL × 0,2 M = 5 mmol Mol NaOH
= 25 mL × 0,1 M = 2,5 mmol
CH3COOH (aq (aq)) + Awal :
5 mmol
NaOH (aq) aq) 2,5 mmol
NaCH3COO(aq COO(aq))
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pH = - log 1 x10 -5 = 5- log 1 =5
17. Sebanyak 100 mL NH 4OH 0,3 M dicampurkan dengan dengan 50 mL H 2SO4 0,2 M, maka pH larutan penyangga tersebut adalah.... (Kb NH 4OH = 1,8 x 10-5 ) A. 5 - log 1,8
C. 5 + log 3,6
B. 5 - log 3,6
D. 9 + log 1,8
E. 9 + log 3,6
JAWABAN : D Penyelesaian :
Diketahui : mmol NH4OH = 100 mL x 0,3 M = 30 mmol
Ditanya
mmol H2SO4
= 50 mL x 0,2 M
Kb NH4OH
= 1,8 x 10-5
= 10 mmol
: pH ........?
NH4OH
+
H2SO4
Mula-mula : 30 mmol
10 mmol
Reaksi
: 10 mmol
10 mmol
Sisa
: 20 mmol
[OH-] = Kb.
= 1,8 x 10 -5 .
= 1,8 x 10 -5 x 2
-
(NH4)2SO4 +
10 mmol 10 mmol
H2O
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18. Perbandingan volum larutan CH 3COOH 0,1 M dan NaOH 0,1 M yang harus dicampurkan untuk membuat larutan penyangga dengan pH = 6 adalah…. ( Ka= 1 x 10 -5) A. 2 : 1
D. 11 : 1
B. 1 : 10
E. 11 : 10
C. 10 : 1 JAWABAN : E Penyelesaian :
Diketahui : V CH3COOH
Ditanya
= 0,1 M
V NaOH
= 0,1 M
pH
=6
: Perbandingan volum CH 3COOH dengan volum NaOH untuk membuat larutan buffer dengan pH = 6
pH
=6
[H+] = 1x10-6 [H+] = Ka
1x10 -6 =
a g
1 10
5
a g
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19. Suatu larutan penyangga terdiri dari y mL y mL larutan CH3COOH 0,1 M dan 200 mL larutan NaCH3COO 0,1 M. Jika diperoleh pH larutan penyangga = 5, maka nilai y nilai y adalah…. (K a CH3COOH = 1 x 10 -5) A. 50 mL
D. 200 mL
B. 100 mL
E. 250 mL
C. 150 mL JAWABAN : D Penyelesaian :
Diketahui : M CH3COOH = 0,1 M V NaCH3COO = 200 mL M NaCH3COO = 0,1 M Ka CH Ka CH3COOH = 1 x 10-5 Ditanya : volume CH3COOH yang harus ditambahkan ke dalam 200 mL larutan NaCH3COO 0,1 M untuk membuat larutan penyangga dengan pH = 5 Penyelesaian : [H+]
= Ka
1x 10-5 =
a g
a g
1 10
=1
5
a g
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20. Di laboratorium tersedia 500 mL larutan NH3 0,1 M. Untuk membuat larutan penyangga dengan pH = 9 diperlukan massa (NH 4)2SO4 sebanyak.... (Kb NH 3 = 1x10-5; Ar H = 1; N= 14; O= 16; S= 32) A. 1,3 gram
D. 4,3 gram
B. 2,3 gram
E. 5,3 gram
C. 3,3 gram JAWABAN : B Penyelesaian :
Diketahui : pH Larutan penyangga NH 3 - NH4+
Ditanya pH
Kb NH Kb NH3
= 1 x 10 -5
V NH3
= 500 mL
: Gram (NH4) 2SO4 yang harus ditambahkan ?
=9
pOH = 5 [OH-]
=9
= Kb
b g
b
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21. Jika perbandingan mol asam : basa konjugasinya adalah 3 : 1, sedangkan Ka asam lemahnya adalah 1 x 10 -5, maka pH larutan adalah.... A. pH < 5
D. pH > 7
B. pH = 5
E. 5 < pH < 7
C. pH > 5 JAWABAN : A Penyelesaian :
Diketahui : Perbandingan mol asam : basa konjugasinya = 3 : 1. Ka =1 Ka =1 x 10 -5 Ditanya
: pH larutan…..?
Penyelesaian : [H+]
= Ka
=
1 10
a g 5
3
1
= 3 x 10 -5 pH
= -log 3 x 10-5
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Penyelesaian Penyelesaian :
Diketahui : Massa HCOOH
= 690 mg
Massa HCOONa = 566 mg V Ba(OH)2
= 1 mL
M Ba(OH)2
= 0,25 M
Ditanya : pH larutan dengan penambahan 1 mL Ba(OH) 2 0,25 M….?
Mol HCOOH
=
Mol HCOONa = Mol Ba(OH)2
= = 15 mmol = = 8,32 mmol
= 1 mL x 0,25 M = 0,25 mmol
2HCOOH (aq ( aq)) + Ba(OH)2 (aq (aq))
Ba(HCOO)2 (aq (aq)) + 2H2O(l O(l )
Awal :
15 mmol
0,25 mmol
8,32 mmol
Reaksi :
0,5 mmol
0,25 mmol
0,25 mmol
Akhir :
14,5 mmol
-
Mol HCOOH
=
14,5 mmol
8,57 mmol
0,25 mmol 0,25 mmol
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23. Sebanyak 100 mL larutan CH3COOH 0,2 M dicampur dengan 100 mL larutan NaOH 0,1 M 0,1 M ( Ka Ka CH3COOH =10 – 5). Berapakah p Berapakah pH H larutan sebelum? A. 2,85 B. 2,6 C. 3,5 D. 2,15 E. 3,25 JAWABAN : A Penyelesaian Penyelesaian :
Diketahui : CH3COOH 0,2 M 0,2 M , volume = 100 mL (20 mmol) NaOH 0,1 M 0,1 M , volume = 100 ml (10 mmol) Ka = 10 – 5 Ditanya: p Ditanya: pH H sebelum dicampurkan = …? Penyelesaian: Sebelum: CH3COOH 0,2 M [H+]
= √
√
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Penyelesaian Penyelesaian :
Diketahui : pH = 9 (basa) M NH3 = 0,1 M V NH3 = 400 mL Ditanyakan : m (NH4)2SO4 ....... ? Jawab. pH = 9 pOH = 5, [OH-] = 10-5 [OH-] = Kb ×
10-5
() )
= 10-5 ×
NH4+ = x = 40 mmol (NH4)2SO4 2NH4+ + SO4-2
20 mmol
40 mmol 20 mmol
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Penyelesaian :
Diketahui: Volume NH3 M NH3
= 100 mL = 0,1 M
Volume NH4Cl = 500 mL M NH4Cl
= 0,1 M
Kb NH3
= 1,8 × 10-5
Ditanyakan : pH larutan = ..................?
Penyelesaian : Mol NH3 = Volume Volume NH NH3 . M NH3 Mol NH4Cl = Volume NH 4Cl . M NH 4Cl = 100 ml 0,1 M
= 500 mL 0,1 M
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Penyelesaian Penyelesaian :
Diketahui : V NH3 M NH3
= 200 mL = 0,2 M
V HNO3 = 200 mL M HNO3 = 0,1 M Kb NH3 = 10-5 Ditanya: pH
Mula-mula : 40 mmol
20 mmol
Terurai
: 20 mmol
20 mmol
20 mmol
Sisa
: 20 mmol
-
20 mmol
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JAWABAN : D Penyelesaian :
Diketahui : pH
=4
Volume CH3COOH = 200 ml = 0,2 L M CH3COOH
= 0,1 M
K a CH3COOH
= 10-5
Mr CH3COONa
= 82
Ditanyakan : Massa CH3COONa = .......................?
Penyelesaian :
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28. Hitunglah perubahan pH, pH, jika 1 mL larutan HCl 1 M ditambahkan ke dalam 50 mL suatu buffer yang semula terdiri atas CH 3COOH 1 M 1 M dan CH3COONa 1 M dengan Ka dengan Ka = 10 – 5. A. 5,5 B. 5 C. 6 D. 6,5 E. 9 JAWABAN : B Penyelesaian :
Diketahui : M HCl
=1M
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29. Ke dalam 2 liter larutan asam asetat 0,2 M ( Ka Ka = 10 – 5) ditambahkan 8 gram NaOH. Hitunglah p Hitunglah pH H larutan yang terjadi! A. 5,5 B. 5 C. 6 D. 6,5 E. 9 JAWABAN : B Penyelesaian :
Diketahui : V CH3COOH M CH3COOH
=2L = 0,2 M
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pH = - log [H+] = - log 10 -5 =5
30. Berapa mol gas NH (STP) yang harus dialirkan ke dalam 150 mL larutan
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ESSAY
SOAL- SOAL BUFFER ( LARUTAN PENYANGGA) 1. Tentukan pH larutan penyangga yang dibuat dengan mencampurkan : a. 50 mL larutan NH 3 0,1 M dengan 50 mL larutan NH 4Cl 0,2 M b. 50 mL larutan NH 0,2M dengan dengan 50 mL larutan HCl 0,15 M
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[OH-] = Ka
= 1 10
b g
5
2,5 7,5
= 3,33 x 10 -6
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2. Tentukan pH larutan yang dibuat dengan mencampurkan 100 mL larutan NH 3 0,1 M dengan 500 mL larutan NH 4Cl 0,1 M ( kb NH3= 1,8 X 10 -5). Penyelesaian :
pH larutan dari 100 mL NH3 0,1 M + 500 mL NH 4Cl 0,1 M ( Kb NH Kb NH =1,8x 10 -5)
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[H+]
= Ka
= 1 10
a g
5
= 5 x 10 -6
0,1 0,2
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