William H. Ukers (author)
- filtrate is combined with hydrochloric acid and heated hydrochloric acid then heat for 2.5 hours ⟨starch extraction procedure⟩
Place 200 cc. of the filtrate in a flask with 20 cc. of hydrochloric acid (sp. gr. 1.125); connect with a reflux condenser and heat in a boiling water bath for 2.5 hours
judge verdicts (4)
- groundedness 1.00 pass — The claim is directly stated in the passage. The quoted text explicitly describes placing 200 cc. of filtrate in a flask with hydrochloric acid and heating in a boiling water bath for 2.5 hours, which fully supports the subject-predicate-object relationship and temporal details.
- qualifier_fidelity 0.60 fail — The time qualifier is unfaithful. The passage states the filtrate is heated in a boiling water bath for 2.5 hours AFTER being treated with hydrochloric acid, not that it is treated with hydrochloric acid for 2.5 hours. The 'when' should specify the treatment occurs at the beginning of this sequence, not equate the treatment duration to 2.5 hours. Additionally, the quote does not fully support the claim's predicate 'is treated with' - the passage shows the filtrate is placed 'with' hydrochloric acid and then subsequently heated, making 'treated with' imprecise about the actual sequence of operations.
- groundedness 1.00 pass — The claim is directly stated in the passage. The text explicitly describes placing 200 cc. of filtrate in a flask with hydrochloric acid and heating in a boiling water bath for 2.5 hours, which matches the claim's core assertion about the filtrate being combined with hydrochloric acid and heated.
- qualifier_fidelity 0.85 pass — The claim is mostly faithful to the passage qualifiers. The viewpoint, stance, sentiment, context, and quote are all accurate and properly grounded in the source text. The time qualifier has a minor issue: while 'when' correctly references '2.5 hours' of heating, the format should be more precisely '2.5 hours in a boiling water bath' rather than 'then heat for 2.5 hours' to fully match the passage's specification of the heating method and duration. However, this is a formatting inconsistency rather than a factual unfaithfulness, and the temporal scope is fundamentally correct. All other qualifiers faithfully reflect the passage.