A sample of unknown acid is dissolved into 100-mL of water (assume negligible vo

Question

A sample of unknown acid is dissolved into 100-mL of water (assume negligible volume change) and divided into two equal volumes. One flask, labeled as flask “a”, is titrated with 15.00ml to end point with 0.20 M NaOH. The second flask, labeled as flask “b”, is not titrated.

Which of the following is false?

Flask “a” contains some conjugate base of the acid before titration

The concentration of A- in the titrated flask “a” is equal to the concentration of HA in the untitrated flask “b”

The number of moles of A- in the titrated flask “a” is not equal to the number of moles of A- in the untitrated flask “b”

With the information provided, it is possible to determine the exact concentration of HA

Flask “a” contains some conjugate base of the acid before titration

The concentration of A- in the titrated flask “a” is equal to the concentration of HA in the untitrated flask “b”

The number of moles of A- in the titrated flask “a” is not equal to the number of moles of A- in the untitrated flask “b”

With the information provided, it is possible to determine the exact concentration of HA

Explanation / Answer

Flask “a” contains some conjugate base of the acid before titration

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