Ch15 Buffer Preparation

Which statement best describes a mixture of 0.50 M  HOCl and 0.50 M NaOCl?

• A solution with a pH > 7 which is not a buffer

•  A solution with a pH < 7 which is not a buffer

• A buffer solution with a pH between 4 and 7
• A buffer solution with a pH between 7 and 10 

Which statement best describes a mixture of 0.10 M HClO₄ and 0.10 M KClO₄ ?

• A solution with a pH > 7 which is not a buffer

•  A solution with a pH < 7 which is not a buffer

• A buffer solution with a pH between 4 and 7
• A buffer solution with a pH between 7 and 10 

Which statement best describes a mixture of 0.10 M K₂CO₃ and 0.10 M KClO₃?

• A solution with a pH > 7 which is not a buffer

•  A solution with a pH < 7 which is not a buffer

• A buffer solution with a pH between 4 and 7
• A buffer solution with a pH between 7 and 10 

Which statement best describes a mixture of 0.10 M  CH₃NH₂  and 0.10 M CH₃NH₃Cl?

• A solution with a pH > 7 which is not a buffer

•  A solution with a pH < 7 which is not a buffer

• A buffer solution with a pH between 4 and 7
• A buffer solution with a pH between 7 and 10 

Which statement best describes a mixture of 0.10 mol HCN and 0.050 mol NaOH (K_{a HCN} = 6.2×10⁻¹⁰) ?

• A buffer solution with a pH = pKa
• A buffer solution with pH< pKa
• A buffer solution with pH > pKa
• A solution which is not a buffer 

Which statement best describes a mixture of 0.10 mol HA and 0.075 mol NaOH ?

• A buffer solution with a pH = pKa
• A buffer solution with pH< pKa
• A buffer solution with pH > pKa
• A solution which is not a buffer 

Which of the following actions exceeds the capacity of a buffer that is 0.10 mol HA and 0.20 mol NaA?

• Adding 0.0020 mol NaOH
• Adding 0.0020 mol HCl
• Adding 0.10 mol NaOH
• Adding 0.10 mol NaA