*Chem-Pract-Answers*

Pls Use Your School End Point.

End point Chose from 15.20, 15.40, 15. 30, 15.40

1 a ) Volume of pepette = 25. 00Cm ^ 2 Indicator Used = Methyl Orange

Tabulate

BURETTE READING | ROUGH | 1 ST| 2 ND | 3 RD | Final reading Cm ^ 3 | 25. 00| 34. 00| 29. 20| 24. 10| Initial Reading Cm ^ 3 | 0 . 00| 10. 00| 5 . 00| 0 . 00| Volume Of Acid Used In Cm ^ 3 | 25. 00| 24. 00| 24. 20|24. 10| Average Volume of Acid used =( 24. 00+ 24. 20+ 24. 10/ 3 ) cm^ 3 = 24. 10cm^ 3

 3i) A white precipitate of barium sulphate will be formed by the instant reaction between barium chloride and sulphuric acid. BaCl2 + H2SO4 = BaSO4 + 2HCl 3b)Iron sulfide reacts with hydrochloric acid, releasing the malodorous (rotten egg smell) and very toxic gas,hydrogen sulphide. FeS + 2 HCl → FeCl2+ H2S When solid iron filings are added to dilute aqueous Hydrochloric acid, Iron (II)chloride or ferrous chloride is formed , with the liberation of Hydrogen gas. Fe (s) + 2HCl (aq) ……..> FeCl2(aq) + H2 (g)