which one of the following pairs of 0.100 mol L-1 solutions, when mixed will produce a buffer solution?
a 50. mL of aquesous CH3COOH and 25.mL of aquesous HCI
b 50. mL of quesous CH3COOH and 100. mL of aqueous NaOH
c 50. mL of aquesous NaOH and 25. mL of aqueous HCI
d 50. mL of aqueous CH3COONa and 25.mL of aquesous NaOH
e 50.mL of aqueous CH3COOH and 25.mL of aqueous CH3COONa
Thanks for any help....
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To determine which pair of solutions will produce a buffer solution, we need to identify a weak acid and its conjugate base (or a weak base and its conjugate acid) among the given options.
A buffer solution consists of a weak acid and its conjugate base (or a weak base and its conjugate acid) in roughly equal amounts. This equilibrium between the weak acid/base and its conjugate form helps maintain the pH of the solution.
Let's analyze the given options:
a) 50 mL of aqueous CH3COOH (acetic acid) and 25 mL of aqueous HCl (hydrochloric acid): This pair includes a weak acid (CH3COOH) but not its conjugate base.
b) 50 mL of aqueous CH3COOH (acetic acid) and 100 mL of aqueous NaOH (sodium hydroxide): This pair includes a weak acid (CH3COOH) but not its conjugate base.
c) 50 mL of aqueous NaOH (sodium hydroxide) and 25 mL of aqueous HCl (hydrochloric acid): This pair does not include a weak acid/base and its conjugate pair.
d) 50 mL of aqueous CH3COONa (sodium acetate) and 25 mL of aqueous NaOH (sodium hydroxide): This pair includes a weak acid/base and its conjugate pair (CH3COOH/CH3COONa).
e) 50 mL of aqueous CH3COOH (acetic acid) and 25 mL of aqueous CH3COONa (sodium acetate): This pair includes a weak acid (CH3COOH) and its conjugate base (CH3COONa).
From the given options, the pair of solutions that will produce a buffer solution is:
d) 50 mL of aqueous CH3COONa and 25 mL of aqueous NaOH.