Suatu Larutan Penyangga Terdiri Dari Asam
Questions and Answers
- 1.
Larutan penyangga adalah larutan yang pHnya….
- A.
Mudah sekali berubah jika ditambah air
- B.
Mudah sekali berubah jika ditambah sedikit asam atau basa
- C.
Tidak mudah berubah jika ditambah asam, tetapi tidak berubah jika ditambah air
- D.
Tidak berubah jika ditambah asam, basa, maupun air
- E.
Tidak berubah jika ditambah asam atau basa, tetapi berubah jika ditambah air
Correct Answer
D. Tidak berubah jika ditambah asam, basa, maupun airExplanation
The correct answer states that a buffer solution does not change its pH when added with acid, base, or water. This is because a buffer solution is a solution that contains a weak acid and its conjugate base or a weak base and its conjugate acid. These components in the buffer solution can react with any added acid or base to maintain a relatively constant pH. Additionally, the presence of water does not significantly affect the pH of a buffer solution. Therefore, the pH of a buffer solution remains unchanged when added with acid, base, or water.Rate this question:
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- 2.
Larutan penyangga dapat dibuat dengan mencampurkan larutan-larutan….
- A.
Asam asetat dengan natrium nitrat
- B.
Asam asetat dengan natrium asetat
- C.
Asam nitrat dengan natrium asetat
- D.
Asam fosfat dengan natrium asetat
- E.
Asam nitrat dengan natrium nitrat
Correct Answer
B. Asam asetat dengan natrium asetatExplanation
Larutan penyangga dapat dibuat dengan mencampurkan asam asetat dengan natrium asetat karena asam asetat adalah asam lemah dan natrium asetat adalah garam dari asam asetat. Ketika asam asetat dan natrium asetat dicampurkan, asam asetat akan melepaskan ion H+ sedangkan natrium asetat akan melepaskan ion asetat (CH3COO-). Ion H+ dari asam asetat dan ion asetat dari natrium asetat akan saling menetralkan sehingga larutan tersebut menjadi penyangga dengan pH yang stabil.Rate this question:
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- 3.
Larutan penyangga yang terdiri dari campuran 100 ml larutan CH3COOH 0,2 M dengan 100 ml larutan CH3COONa 0,2 M. Ka CH3COOH = 10-5, maka pH campuran tersebut adalah….
- A.
4
- B.
5
- C.
6
- D.
7
- E.
8
Correct Answer
B. 5Explanation
The correct answer is 5. This is because the mixture of CH3COOH and CH3COONa acts as a buffer solution. A buffer solution resists changes in pH when small amounts of acid or base are added to it. In this case, CH3COOH is a weak acid and CH3COONa is its conjugate base. The Ka value of CH3COOH indicates that it is a weak acid that only partially dissociates in water. The presence of equal concentrations of CH3COOH and CH3COONa in the mixture ensures that the solution can resist changes in pH. Therefore, the pH of the mixture will be close to the pKa of CH3COOH, which is 5.Rate this question:
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- 4.
Campuran yang membentuk larutan penyangga adalah….
- A.
50 ml NaOH 0,5 M + 50 ml HCl 0,5 M
- B.
50 ml NH4OH 0,5 M + 50 ml HCl 0,5 M
- C.
100 ml NH4OH 0,5 M + 100 ml HCl 0,5 M
- D.
100 ml CH3COOH 0,1 M + 100 ml NaOH 0,1 M
- E.
100 ml CH3COOH 0,2 M + 100 ml NaOH 0,1 M
Correct Answer
E. 100 ml CH3COOH 0,2 M + 100 ml NaOH 0,1 MExplanation
The correct answer is 100 ml CH3COOH 0,2 M + 100 ml NaOH 0,1 M. This is because a buffer solution is formed by a weak acid and its conjugate base, or a weak base and its conjugate acid. In this case, CH3COOH is a weak acid and NaOH is a strong base. When they are mixed together in equal amounts, they will form a buffer solution with a pH close to the pKa of CH3COOH. The concentration of CH3COOH is 0,2 M, which is higher than the other options, making it a more suitable choice for a buffer solution.Rate this question:
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- 5.
Suatu larutan penyangga terdiri dari asam lemah HA dan garam natriumnya (NaA).Konsentrasi asam HA dalam larutan itu adalah 0,2 M. Berapakah konsentrasilarutan NaA, sehingga pH larutan sama dengan pKa asam HA?
- A.
0,1 M
- B.
1,0 M
- C.
2,0 M
- D.
0,2 M
- E.
0,02 M
Correct Answer
D. 0,2 MExplanation
The concentration of the NaA solution needs to be equal to that of the weak acid HA in order for the pH of the solution to be equal to the pKa of HA. Therefore, the concentration of the NaA solution should be 0.2 M, which is the same as the concentration of the HA solution.Rate this question:
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- 6.
Jika perbandingan mol asam : basa konjugasinya adalah 3 : 1, sedangkan Ka asam lemahnya adalah 10-5, maka pH larutan adalah
- A.
pH < 5
- B.
PH = 5
- C.
PH > 5
- D.
PH > 7
- E.
5 < pH < 7
Correct Answer
A. pH < 5Explanation
The given information states that the ratio of acid to its conjugate base is 3:1, and the Ka value of the weak acid is 10-5. A lower Ka value indicates a weaker acid, which means a higher concentration of the conjugate base. Since the ratio of acid to its conjugate base is 3:1, it implies that the concentration of the acid is lower than the concentration of its conjugate base. Therefore, the pH of the solution will be less than 5, indicating an acidic solution.Rate this question:
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- 7.
Perbandingan volume antara larutan CH3COOH 0,1 M (Ka = 1x10-5) dan larutan NaOH 0,1 M yang harus dicampurkan untuk membuat larutan penyangga dengan pH = 6 adalah
- A.
2 : 1
- B.
1 : 10
- C.
10 : 1
- D.
11 : 1
- E.
11 : 10
Correct Answer
B. 1 : 10Explanation
The correct answer is 1 : 10. In order to create a buffer solution with a pH of 6, the ratio of the volume of acetic acid (CH3COOH) solution with a concentration of 0.1 M to the volume of sodium hydroxide (NaOH) solution with a concentration of 0.1 M should be 1 : 10. This is because acetic acid is a weak acid with a dissociation constant (Ka) of 1x10-5, and sodium hydroxide is a strong base. To create a buffer, the weak acid and its conjugate base (CH3COO-) need to be present in a higher concentration than the strong base to maintain the desired pH.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jan 06, 2017Quiz Created by
Arnohans
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