Question 1
Multiple choiceEasy1 markFour monoprotic acids are prepared as aqueous solutions at the same temperature and with the same initial concentration. Which sample contains the weakest acid?
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Answer: B. At equal initial concentration and temperature, the weakest acid ionizes to the smallest extent. Sample S has the smallest ionized fraction, 5%, so it is the weakest.
A: Q is partially ionized, but choosing it ignores the still smaller ionized fraction for S.
C: P has the greatest ionization, 100%; this reverses the relationship and identifies the strongest acid.
D: R has a smaller ionized fraction than Q, but its 20% exceeds S’s 5%.
Remember: compare the extent of ionization, not the initial concentration.