Identification Of Ions And Gases (continued)
Akopọ
Faced with an unknown solution, a chemist can name the ions in it using a short list of simple, reliable tests. A few drops of sodium hydroxide, a wisp of ammonia, a flame and a damp piece of litmus paper are enough to identify a whole range of cations and gases by the colours they produce.
In this lesson you will learn the tests for aqueous cations using sodium hydroxide and ammonia solution, the flame-test colours of the common metal ions, and the tests for six important gases. These are high-value, frequently examined practical facts, and learning the exact colours is worth easy marks.
Awọn Afojusun
- Describe tests using aqueous sodium hydroxide and aqueous ammonia to identify the aqueous cations: (a) aluminium, Al³⁺ (b) ammonium, NH₄⁺ (c) calcium, Ca²⁺ (d) chromium(III), Cr³⁺ (e) copper(II), Cu²⁺ (f) iron(II), Fe²⁺ (g) iron(III), Fe³⁺ (h) zinc, Zn²⁺.
- Describe tests to identify the gases: (a) ammonia, NH₃, using damp red litmus paper (b) carbon dioxide, CO₂, using limewater (c) chlorine, Cl₂, using damp litmus paper (d) hydrogen, H₂, using a lighted splint (e) oxygen, O₂, using a glowing splint (f) sulfur dioxide, SO₂, using acidified aqueous potassium manganate(VII).
- Describe the use of a flame test to identify the cations: (a) lithium, Li+ (b) sodium, Na+ (c) potassium, K+ (d) calcium, Ca2+ (e) barium, Ba2+ (f) copper(II), Cu2+.
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Oriire fun ipari ẹkọ lori Identification Of Ions And Gases (continued). 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.
- Which cation gives a light blue precipitate with sodium hydroxide that does NOT dissolve in excess? A. Aluminium B. Copper(II) C. Zinc D. Calcium Answer: B
- Which cation gives a precipitate that dissolves in excess ammonia to form a dark blue solution? A. Iron(III) B. Copper(II) C. Calcium D. Aluminium Answer: B
- What is the flame-test colour of a potassium ion? A. Yellow B. Red C. Lilac D. Light green Answer: C
- Which gas relights a glowing splint? A. Hydrogen B. Carbon dioxide C. Oxygen D. Ammonia Answer: C
- Which gas turns damp red litmus paper blue? A. Chlorine B. Carbon dioxide C. Sulfur dioxide D. Ammonia Answer: D
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Identification Of Ions And Gases (continued)? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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