DAT - Dental Admission General Chemistry: Acid-Base Chemistry Flashcards
6 cards from real DAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 DAT - Dental Admission General Chemistry: Acid-Base Chemistry flashcards as text
In an acid-base titration, the equivalence point is defined as the point when:
Answer: Moles of acid exactly equal moles of base
The equivalence point occurs when the moles of titrant exactly equal the moles of analyte, not necessarily at pH 7.
At the half-equivalence point in a weak acid-strong base titration:
Answer: pH = pKa
At the half-equivalence point, [HA] = [A⁻], so by Henderson-Hasselbalch, pH = pKa + log(1) = pKa.
Which indicator is most appropriate for a strong acid-strong base titration?
Answer: Bromothymol blue (range 6.0–7.6)
Bromothymol blue is ideal because its color-change range (6.0–7.6) encompasses the pH 7 equivalence point of a strong acid-strong base titration.
The equivalence point of a weak base-strong acid titration has a pH that is:
Answer: Below 7
At equivalence, only the conjugate acid of the weak base remains in solution; this conjugate acid is itself a weak acid, making the solution acidic (pH < 7).
According to Lewis acid-base theory, a Lewis acid is an electron pair:
Answer: Acceptor
A Lewis acid accepts an electron pair from a Lewis base to form a coordinate covalent bond.
Which compound is a Lewis acid but NOT a Brønsted-Lowry acid?
Answer: BF₃
BF₃ accepts electron pairs (Lewis acid) but has no proton to donate, so it cannot be a Brønsted-Lowry acid.