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Identification of Anions

Identification of Anions | Chemistry for Grade 11 (IGCSE)

Acidification with aqueous silver nitrate and aqueous barium nitrate/chloride is performed to eliminate ions that could lead to incorrect positive outcomes.

  • The most frequently removed ion is carbonate ion.
  • The choice of acid needs to be carefully considered to prevent it from affecting the results.
  • For instance, avoid acidifying aqueous silver nitrate solution with hydrochloric acid as it will produce a white precipitate due to the chloride ion present in the acid.
  • Similarly, avoid acidifying aqueous barium nitrate/chloride solution with sulfuric acid as it will result in a white precipitate due to the sulfate ion present in the acid.

Question for Identification of Anions
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What is the most frequently removed ion during the process of acidification using silver nitrate and barium nitrate/chloride?
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FAQs on Identification of Anions - Chemistry for Grade 11 (IGCSE)

1. What are anions?
Ans. Anions are negatively charged ions that are formed when an atom gains one or more electrons.
2. How are anions identified in a laboratory setting?
Ans. Anions can be identified through various chemical tests such as precipitation reactions, flame tests, and complexation reactions.
3. What are some common anions that are tested for in analytical chemistry?
Ans. Common anions that are tested for in analytical chemistry include chloride (Cl-), sulfate (SO4 2-), carbonate (CO3 2-), nitrate (NO3 -), and phosphate (PO4 3-).
4. Why is it important to accurately identify anions in a sample?
Ans. Accurate identification of anions is important in various fields such as environmental monitoring, water treatment, and pharmaceutical analysis as they can provide valuable information about the composition and purity of a sample.
5. Can anions be identified using instrumental techniques?
Ans. Yes, anions can also be identified using instrumental techniques such as ion chromatography, mass spectrometry, and infrared spectroscopy for more precise and reliable results.
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