10th std HCl.pptx class 4 icse geography

Class 4 icse

1. STUDY OF COMPOUNDS [Ch 7] Hydrogen chloride HCl Syllabus Laboratory preparation Experiments to show density and solubility of a gas Reaction with ammonia Method of preparation of hydrochloric acid Acidic properties of its solution [ Hydrochloric acid] Precipitation reactions with silver nitrate and lead nitrate solutions

2. Laboratory preparation of HCl gas   2222

3. Laboratory preparation of HCl gas  

4. Laboratory preparation of HCl gas Precautions : Lower end of thistle funnel to be dipped in the acid in flask . Collection : U pward displacement of air as HCl gas is heavier than air. Not collected over water as HCl gas is highly soluble . Identification : Dense white fumes are observed when glass rod dipped in ammonia solution is brought near the HCl gas. HCl [g] + NH 3 [g] NH 4 Cl [s]

5. Experiment to show that HCl gas is heavier than air

6. Experiment to show that HCl gas is HIGHLY SOLUBLE in water Fountain experiment Highly soluble Acidic in nature

7. Preparation of hydrochloric acid

8. Special Funnel arrangement Advantages – 1. Prevents or minimizes back – suction of water. 2. Provides a large surface area for absorption of HCl gas.

9. General equation / word equation Active metal + dil. Acid Salt + Hydrogen Base + dil. Acid Salt + Water (only) Carbonate/ Bicarbonate + dil.Acid Salt + Water + carbon dioxde Sulphite / Bisulphite + dil.Acid Salt + Water + sulphurdioxde Sulphide + dil.Acid Salt + Hydrogen sulphide

10. Reactions of dil.HCl 1. 2 Al + 6 HCl 2 AlCl 3 + 3 H 2 2. CuO + 2 HCl CuCl 2 + H 2 O 3. NaOH + HCl NaCl + H 2 O 4. Na 2 CO 3 + 2HCl 2 NaCl + H 2 O + CO 2 5. KHCO 3 + HCl KCl + H 2 O + CO 2 6. Na 2 SO 3 + 2HCl 2 NaCl + H 2 O + SO 2 7. KHSO 3 + HCl KCl + H 2 O + SO 2

11. Reaction of dil.HCl 8 . FeS + 2 HCl FeCl 2 + H 2 S 9. AgNO 3 + HCl AgCl + HNO 3 white ppt 10. Pb (NO 3 ) 2 + 2HCl PbCl 2 + 2HNO 3 white ppt AgCl + 2NH 4 OH Ag[(NH 3 ) 2 ] Cl + 2H 2 O Diamine silver chloride

12. Tests for HCl [practical chemistry] TESTS OBSERVATIONS 1. Glass rod dipped in ammonia solution [NH4OH] brought near vapours of HCl gas 1. Dense white fumes 2. Addition of AgNO3 soln to dil.HCl 2. Curdy white precipitate soluble in excess NH 4 OH and forms colourless solution. 3. Action of heat on mixture of MnO2 and conc. HCl 3. Greenish yellow gas [Cl2] evolved

13. Answer the following questions Identify the gas evolved when dilute hydrochloric acid reacts with Potassium sulphite Iron[II]sulphide Sodium bicarbonate Zinc

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