Lesson 3.1.12.6
3.1.12.6 Buffer action Quiz: AQA Chemistry, Unit 1
20 questions
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Lesson 3.1.12.6, Buffer action: 20 multiple choice questions for the AQA Chemistry (7405), Unit 1: Physical chemistry, written with Revision Ninja.
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The 20 questions
-
Which type of solution resists changes in pH when small amounts of acid are added?
- Standard solution
- Buffer solution
- Saturated solution
- Neutral solution
-
Which pair of substances is used to prepare an acidic buffer solution?
- Weak acid and salt
- Strong base and salt
- Strong acid and salt
- Weak base and salt
-
Which pair of substances is used to prepare a basic buffer solution?
- Weak base and salt
- Weak acid and salt
- Strong acid and salt
- Strong base and salt
-
Which mixture of compounds forms an acidic buffer solution?
- HNO3 and KNO3
- CH3COOH and CH3COONa
- NH3 and NH4Cl
- HCl and NaCl
-
Which mixture of compounds forms a basic buffer solution?
- NH3 and NaOH
- CH3COOH and CH3COONa
- HCl and NH4Cl
- NH3 and NH4Cl
-
Which species reacts with added H+ ions in an ethanoic acid buffer?
- Water molecules
- Sodium ions
- Ethanoate ions
- Ethanoic acid
-
Which species reacts with added OH- ions in an ethanoic acid buffer?
- Sodium ions
- Hydrogen ions
- Ethanoic acid
- Ethanoate ions
-
An acidic buffer has pKa = 4.74. What is the pH when the acid and salt concentrations are equal?
- 4.74
- 7.00
- 2.87
- 9.26
-
An acidic buffer has pKa = 4.74. The acid is 0.30 mol dm^-3 and the salt is 0.10 mol dm^-3. What is the pH?
- 4.26
- 5.22
- 4.74
- 3.56
-
An acidic buffer has pKa = 4.74. The acid is 0.10 mol dm^-3 and the salt is 0.40 mol dm^-3. What is the pH?
- 4.74
- 6.40
- 4.14
- 5.34
-
An acidic buffer has pKa = 4.74. A 1 dm^3 buffer contains 0.50 mol of acid and 0.50 mol of salt, and 0.25 mol of extra salt is added with no change in acid amount. What is the new pH, to two decimal places?
- 5.22
- 4.74
- 4.92
- 4.44
-
Why does diluting a buffer solution with water leave its pH unchanged?
- Ka value increases
- Acid fully dissociates
- Component ratio unchanged
- Salt precipitates completely
-
Which biological fluid is buffered by hydrogencarbonate ions to maintain constant pH?
- Urine
- Blood
- Saliva
- Gastric juice
-
Which parameter in living systems is kept almost constant by a buffer solution?
- Temperature
- Concentration
- Pressure
- pH
-
Which type of acid is required to prepare an acidic buffer solution?
- Weak acid
- Sulfuric acid
- Concentrated acid
- Strong acid
-
What change increases the buffering capacity of an acidic buffer solution?
- Increasing temperature
- Higher acid concentration
- Adding pure water
- Lowering salt concentration
-
Which pair of substances does NOT form a buffer solution when mixed?
- HCl and NaOH
- CH3COOH and CH3COONa
- NH3 and NH4Cl
- HCOOH and HCOONa
-
A buffer has pKa = 4.74 and [salt]/[acid] = 10. What is its pH?
- 6.74
- 5.74
- 3.74
- 4.74
-
What species in an acidic buffer reacts with added hydroxide ions?
- Water molecule
- Weak acid
- Conjugate base
- Salt anion
-
What species in a basic buffer reacts with added hydrogen ions?
- Weak base
- Water molecule
- Conjugate acid
- Hydroxide ion
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