Select the following solutions that would form a buffer. Select all that apply.

A. 0.1M HNO3 and 0.15M NH4Cl

B. 0.5M NaNO2 and 0.5M HNO2

C. 0.1M KC6H5COO and 0.05M C6H5COOH

D. 0.1M NH3 and 0.1M KClO

E. 0.05M NaOH and 0.1M HCHO2

F. 0.1M KF and 0.15M HCl

G. 0.1M HBr and 0.1M NaOH

B. 0.5M NaNO₂ and 0.5M HNO₂.

C. 0.1M KC₆H₅COO and 0.05M C₆H₅COOH.

E. 0.05M NaOH and 0.1M HCHO₂.

Explanation:

A buffer is made of 2 components:

A weak acid and its conjugate base or A weak base and its conjugate acid

Select the following solutions that would form a buffer. Select all that apply.

A. 0.1M HNO₃ and 0.15M NH₄Cl. NO. HNO₃ is a strong acid

B. 0.5M NaNO₂ and 0.5M HNO₂. YES. HNO₂ is a weak acid and NO₂⁻ (coming from NaNO₂) its conjugate base.

C. 0.1M KC₆H₅COO and 0.05M C₆H₅COOH. YES. C₆H₅COOH is a weak acid and C₆H₅COO⁻ (coming from KC₆H₅COO) its conjugate base.

D. 0.1M NH₃ and 0.1M KClO. NO. It does not have the components of a buffer system.

E. 0.05M NaOH and 0.1M HCHO₂. YES. HCHO₂ is a weak acid that can react with NaOH to produce CHO₂⁻, its conjugate base.

F. 0.1M KF and 0.15M HCl. NO. HCl is a strong acid.

G. 0.1M HBr and 0.1M NaOH. NO. HBr is a strong acid.