Question
Between 2019 and 2023, a campaign in Bangladesh against the adulteration of turmeric with the lead salt of this ion probably saved a hundred thousand children’s lives. For 10 points each:
[10h] Name this toxic inorganic ion which is widely used to dye turmeric because of its vivid yellow color.
ANSWER: chromate [or CrO4 2-; reject “chrome” or “chromium”]
[10e] Turmeric is also often adulterated with metanil yellow, which is normally used as one of these chemicals. Phenolphthalein (“FEE-nolff-THAY-leen”) is another of these chemicals that change color at the endpoint of a titration.
ANSWER: pH indicator [or indicator solution; or acid–-base indicators]
[10m] Metanil yellow can be detected by adding hydrochloric acid, which turns the fake turmeric this color. Phenolphthalein turns this color in base.
ANSWER: pink [accept purple; accept fuchsia; accept magenta; reject “red”]
<Adam Silverman, Science - Chemistry> ~22944~ <Editor: Adam Silverman>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2024 PACE NSC | 06/08/2024 | Y | 36 | 16.39 | 100% | 64% | 0% |