Answer:
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:
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.
