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Questions and Answers
A weak base LOH 0.1 M solution has a $K_b$ value of $1 \times 10^{-5}$. What is its pH value?
A weak base LOH 0.1 M solution has a $K_b$ value of $1 \times 10^{-5}$. What is its pH value?
- 13
- 5
- 1
- 3
- 11 (correct)
To neutralize 20 mL of a 0.2 M $H_2SO_4$ solution, what volume of 0.2 M NaOH solution is required?
To neutralize 20 mL of a 0.2 M $H_2SO_4$ solution, what volume of 0.2 M NaOH solution is required?
- 15 mL
- 20 mL
- 10 mL
- 40 mL (correct)
- 5 mL
To neutralize 100 mL of a 1 M HCl solution, what mass of solid NaOH is required? (Mr NaOH = 40)
To neutralize 100 mL of a 1 M HCl solution, what mass of solid NaOH is required? (Mr NaOH = 40)
- 40 gram
- 0.2 gram
- 2 gram
- 4 gram (correct)
- 20 gram
A KOH solution has a pH of 11. If the molar mass of KOH is 56 g/mol, what is the mass of KOH dissolved in 3 liters of this solution?
A KOH solution has a pH of 11. If the molar mass of KOH is 56 g/mol, what is the mass of KOH dissolved in 3 liters of this solution?
A 0.02 M $H_2SO_4$ solution will give the same color with an indicator as a 0.2 M HA solution. What is the ionization constant ($K_a$) of HA?
A 0.02 M $H_2SO_4$ solution will give the same color with an indicator as a 0.2 M HA solution. What is the ionization constant ($K_a$) of HA?
100 mL of a 0.01 M HCl solution has what pH?
100 mL of a 0.01 M HCl solution has what pH?
A 0.01 M $H_2SO_4$ solution has what pH?
A 0.01 M $H_2SO_4$ solution has what pH?
Which reaction indicates that $HClO_4$ acts as a base?
Which reaction indicates that $HClO_4$ acts as a base?
A 0.05 M $CH_3COOH$ solution has a degree of ionization ($\alpha$) of 0.02. What is its pH?
A 0.05 M $CH_3COOH$ solution has a degree of ionization ($\alpha$) of 0.02. What is its pH?
A solution of HCl in water has a pH of 3. By what factor must the solution be diluted to change the pH to 4?
A solution of HCl in water has a pH of 3. By what factor must the solution be diluted to change the pH to 4?
Flashcards
What is a basic solution?
What is a basic solution?
A solution with pH greater than 7.
What is pH?
What is pH?
The negative logarithm of hydrogen ion concentration; measures acidity/basicity.
What is a buffer solution?
What is a buffer solution?
A solution that resists changes in pH when small amounts of acid or base are added.
What is titration?
What is titration?
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What is the equivalence point?
What is the equivalence point?
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What is a pH indicator?
What is a pH indicator?
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What is degree of ionization?
What is degree of ionization?
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What is concentration?
What is concentration?
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What defines a base?
What defines a base?
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Study Notes
- The pH value of a 0.1 M weak base LOH solution, which has a Kb value of 1 × 10⁻⁵, is 11.
- To neutralize 20 mL of 0.2 M H₂SO₄ solution, 20 mL of 0.2 M NaOH solution is needed.
- To neutralize 100 mL of 1 M HCl solution, 4 grams of solid NaOH is needed (Mr NaOH = 40).
- For a KOH solution with pH = 11, the mass of KOH dissolved in 3 liters of solution is 0.168 grams (molar mass KOH = 56 gram/mol).
- A 0.02 M H₂SO₄ solution will produce the same color as a 0.2 M HA solution if dripped with the same indicator; the ionization constant (Ka) of HA is 4 × 10⁻³.
- 100 mL of 0.01 M HCl solution has a pH of 2.
- 0.01 M H₂SO₄ solution has a pH of 2 + log 2.
- The reaction that indicates HClO₄ is basic is HClO₄ + N₂H₅⁺ = H₂ClO₄⁺ + N₂H₄.
- A 0.05 M CH₃COOH solution, which ionizes with a degree of ionization (α) = 0.02, has a pH of 3.
- An HCl solution in water with a pH of 3 will change to pH = 4 if the solution is diluted 10 times.
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