Identification Of Ions And Gases
Akopọ
Given an unknown white powder or a colourless gas, a chemist can find out exactly what it is using a set of simple, reliable tests. A flame turns a telltale colour, a few drops of a reagent give a coloured precipitate, and a glowing splint reveals a gas. This is the chemistry of detective work.
In this lesson you will learn the flame-test colours of common metal ions, and the tests that identify gases such as hydrogen, oxygen, carbon dioxide, ammonia and chlorine. These tests let you identify substances from the evidence they give.
Awọn Afojusun
- Describe tests to identify the anions: (a) carbonate, CO₃²⁻, by reaction with dilute acid and then testing for carbon dioxide gas (b) chloride, Cl⁻, bromide, Br⁻, and iodide, I⁻, by acidifying with dilute nitric acid then adding aqueous silver nitrate (c) nitrate, NO₃⁻, reduction with aluminium foil and aqueous sodium hydroxide and then testing for ammonia gas (d) sulfate, SO₄²⁻, by acidifying with dilute nitric acid and then adding aqueous barium nitrate (e) sulfite, SO₃²⁻, by reaction with acidified aqueous potassium manganate(VII).
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Oriire fun ipari ẹkọ lori Identification Of Ions And Gases. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- What flame colour does a sodium ion give? A. Lilac B. Yellow C. Red D. Green Answer: B
- What flame colour does a potassium ion give? A. Yellow B. Lilac C. Orange-red D. Blue-green Answer: B
- How is hydrogen gas identified? A. Relights a glowing splint B. Squeaky pop with a lighted splint C. Turns limewater milky D. Bleaches litmus paper Answer: B
- How is oxygen gas identified? A. Squeaky pop B. Relights a glowing splint C. Turns limewater milky D. Turns litmus red Answer: B
- Which gas turns limewater milky? A. Hydrogen B. Oxygen C. Carbon dioxide D. Ammonia Answer: C
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