Which one of the following is a buffer solution? A. HCOOH+HCOO−
B. CH3COOH+CH3COO−
C. H2CO−4+C2O2−4
D. H3BO3+BO3−3

A and B are buffer solutions

Explanation:

A buffer is the mixture of a weak base and its conjugate base or vice versa:

Formic acid, HOOH, is a weak acid and its conjugate base is HCOO⁻:

A. HCOOH+HCOO− . Is a buffer.

Acetic acid, CH₃COOH is a weak acid and its conjugate base is CH₃COO⁻:

B. CH₃COOH+CH₃COO− . Is a buffer.

Oxalic acid, H₂CO₄, is a weak acid but its conjugate base is HCO₄⁻.

C. H2CO−4+C2O2−4 . Is not a buffer

Boric acid, H₃BO₃ is a weak acid but its conjugate base is H₂BO₃⁻

D. H₃BO₃ + BO₃³⁻. Is not a buffer.

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for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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