All topicsA student standardizes a solution of aqueous NaOH against a measured mass of solid potassium hydrogen phthalat2016 national · question 1018%A chemist has isolated a solid carboxylic acid of unknown formula from a medicinal herb. Which experiment will2019 national · question 1119%Which experiment would be most appropriate for determining the number of components in a commercial nail polis2022 national · question 1023%
Descriptive and laboratory
This is block 2 of 10, questions 7–12 on both the local section exam and national Part I. Across the 39 national questions where ACS published item statistics, qualifiers answered 50% correctly, which makes it the sixth hardest of the 10.
What it covers
ion colorssolubility rulesflame testsreactions of main-group elementstransition metalslab techniquegas identificationsafety
Where qualifiers lose points
% who got it rightThese are the descriptive and laboratory questions the fewest national qualifiers answered correctly. If you can do these, the block is not your problem.
Every question is from a published past exam and carries its source. Practice adapts to what you miss, and anything you get wrong comes back on a spaced schedule. No account needed. See the other nine blocks.