Remed Uts Genap Xi IPA-1 Smanio (The Number Of Students Absent 11-20)

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  • 1/10 Questions

    Jika ke dalam 50 mL larutan penyangga dengan pH = 5 ditambahkan 50 mL akuades maka ....

    • PH akan naik drastis
    • PH akan turun drastis
    • PH akan naik sedikt
    • PH akan turun sedikit
    • PH tidak berubah
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Remed Uts Genap Xi IPA-1 Smanio (The Number Of Students Absent 11-20) - Quiz
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  • 2. 
    - ProProfs

    • 3,5 dan 6

    • 3,4 dan 6

    • 2,4 dan 6

    • 1,3 dan 6

    • 1,2 dan 6

    Correct Answer
    A. 1,3 dan 6
  • 3. 

    Besarnya pH larutan 0,74 gram Ca(OH)2 (Ar Ca = 40, O = 16, dan H = 1) dalam 500 mL larutan adalah … .

    • 2 – log 4

    • 2 + log 4

    • 11 + log 4

    • 12 – log 4

    • 12 + log 4

    Correct Answer
    A. 12 + log 4
    Explanation
    The given expression is 12 + log 4. The logarithm of 4 is approximately 0.602, so when we add 12 to it, the result is approximately 12.602. Therefore, the answer is 12 + log 4.

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  • 4. 

    Larutan penyangga merupakan campuran dari ....

    • Asam lemah dan basa lemah

    • Asam lemah dan basa kuat

    • Asam kuat dan garamnya

    • Asam kuat dan basa kuat

    • Asam lemah dan garamnya

    Correct Answer
    A. Asam lemah dan garamnya
    Explanation
    Larutan penyangga terbentuk dari asam lemah dan garamnya. Asam lemah memberikan ion H+ sedangkan garamnya memberikan ion konjugat yang dapat menerima ion H+. Ini memungkinkan larutan penyangga untuk menjaga kestabilan pH ketika asam atau basa ditambahkan ke dalamnya. Asam kuat dan basa kuat tidak dapat membentuk larutan penyangga karena mereka sepenuhnya terionisasi dalam air dan tidak ada ion yang tersedia untuk menjaga kestabilan pH.

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  • 5. 

    Peristiwa hidrolisis tidak terjadi pada larutan ….

    • CH3COOK

    • CH3COONH4

    • (NH4)2SO4

    • NH4Cl

    • K2SO4

    Correct Answer
    A. K2SO4
    Explanation
    Hydrolysis is a chemical reaction where water breaks down a compound into its constituent ions. In the given options, K2SO4 is the only compound that does not undergo hydrolysis. This is because K2SO4 is a salt composed of a strong base (KOH) and a strong acid (H2SO4), which means it dissociates completely in water into K+ and SO4 2- ions without reacting with water to form any new compounds. Therefore, hydrolysis does not occur in K2SO4 solution.

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  • 6. 

    Sebanyak 200 mL NH4OH 0,4 M (Kb = 10–5 M) dicampurkan dengan 200 mL HCl 0,2 M membentuk larutan penyangga dengan pH ....

    • 5

    • 9

    • 10

    • 11

    • 12

    Correct Answer
    A. 5
    Explanation
    When NH4OH and HCl are mixed together, they react to form NH4Cl, which is a salt. NH4Cl is the conjugate acid of NH4OH, and it can act as a weak acid in solution. Since NH4Cl is a weak acid, it will partially dissociate in water, releasing H+ ions. These H+ ions will then react with the OH- ions from the dissociation of NH4OH, forming water. This reaction helps to buffer the pH of the solution. The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation, which is pH = pKa + log([A-]/[HA]). In this case, NH4Cl is the conjugate acid (HA) and NH3 is the conjugate base (A-). The pKa of NH4Cl can be calculated using the equation pKa = -log(Ka), where Ka is the acid dissociation constant. Since NH4Cl is a salt of a weak acid and a strong base, the pKa can be approximated as the pKw - pKb, where pKw is the ion product of water (14) and pKb is the pKa of the base (NH4OH). Therefore, pKa = 14 - 5 = 9. Plugging this value into the Henderson-Hasselbalch equation, we get pH = 9 + log([NH3]/[NH4+]). Since the concentration of NH3 and NH4+ are equal in the buffer solution, the ratio [NH3]/[NH4+] is 1, and log(1) = 0. Therefore, the pH of the buffer solution is 9 + 0 = 9.

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  • 7. 

    Jika 0,56 gram logam A direaksikan dengan larutan HCl akan diperoleh gas H2 sebanyak 0,005 mol dan larutan ACl2. Massa atom relatif logam A adalah ….

    • 7

    • 14

    • 28

    • 56

    • 112

    Correct Answer
    A. 56
    Explanation
    When 0.56 grams of metal A reacts with HCl solution, it produces 0.005 mol of H2 gas and a solution of ACl2. The relative atomic mass of metal A can be calculated by dividing the mass of metal A (0.56 grams) by the number of moles of metal A (0.005 mol). This gives a value of 112 grams/mol. However, the question asks for the mass of the atom, not the molar mass. Since 1 mol of metal A contains 6.022 x 10^23 atoms, the mass of one atom of metal A can be calculated by dividing the molar mass by Avogadro's number. Therefore, the mass of one atom of metal A is 112 grams/mol divided by 6.022 x 10^23, which is approximately 1.86 x 10^-22 grams. The closest option to this value is 56, which is the correct answer.

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  • 8. 

    Dari campuran larutan berikut yang menghasilkan garam terhidrolisis sebagian dan bersifat basa adalah ....

    • 50 mL 0,5 M HCl + 50 mL 0,5 M NaOH

    • 50 mL 0,5 M HCl + 50 mL 0,5 M NH3

    • 50 mL 0,5 M HCl + 100 mL 0,5 M NH3

    • 50 mL 0,5 M CH3COOH + 50 mL 0,5 M NH3

    • 50 mL 0,5 M CH3COOH + 50 mL 0,5 M NaOH

    Correct Answer
    A. 50 mL 0,5 M HCl + 50 mL 0,5 M NH3
    Explanation
    The correct answer is 50 mL 0,5 M HCl + 50 mL 0,5 M NH3. This is because when hydrochloric acid (HCl) reacts with ammonia (NH3), it forms ammonium chloride (NH4Cl), which is a salt that undergoes partial hydrolysis. The hydrolysis of NH4Cl results in the formation of ammonium ions (NH4+) and hydroxide ions (OH-). Since hydroxide ions are present, the solution will have a basic nature.

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  • 9. 

    Larutan NH3 0,1 M mempunyai pH = 11, pH larutan NH4Cl 0,1 M adalah ….

    • 11

    • 9

    • 7

    • 5

    • 3

    Correct Answer
    A. 5
    Explanation
    The correct answer is 5. The pH of a solution is a measure of its acidity or alkalinity. A pH of 11 indicates that the solution is basic or alkaline. When NH3 (ammonia) dissolves in water, it forms NH4+ (ammonium) and OH- (hydroxide) ions. NH4Cl is the salt formed by the reaction of NH4+ and Cl- ions. Since NH4+ is the conjugate acid of NH3, it can release H+ ions in solution, making it acidic. Therefore, the pH of a 0.1 M NH4Cl solution would be less than 7, making option 5 the correct answer.

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  • 10. 

    Garam yang mempunyai pH > 7 dalam larutannya adalah ….

    • NaCl

    • Na2SO4

    • NH4Cl

    • K2CO3

    • K2SO4

    Correct Answer
    A. K2SO4
    Explanation
    Garam yang mempunyai pH > 7 dalam larutannya adalah K2SO4. Ini disebabkan oleh ion sulfat (SO4^2-) yang dapat menerima proton dari air dan membentuk ion hidroksida (OH^-), meningkatkan konsentrasi ion OH^- dalam larutan. Konsentrasi ion OH^- yang tinggi menyebabkan larutan menjadi basa, sehingga memiliki pH > 7.

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  • Jul 22, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 22, 2012
    Quiz Created by
    Srilestari
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