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Concentrated sulphuric acid can dehydrate i.e. The reaction can be represented in the following way: C12(H2O)11 → 12C + 11H2O . A. Saeid, K. Chojnacka, in Encyclopedia of Toxicology (Third Edition), 2014. If you add concentrated sulphuric acid to sugar , the acid acts as a dehydrating agent and removes the water from the sugar molecule. It cannot replace hydrogen atoms in dilute sulphuric acid. Sulphuric acid is used as drying agent and dehydrating agent because Sulphuric acid has a great affinity for water. For example, ethene reacts to give ethyl hydrogensulphate: CH2=CH2 + H2SO4 → CH3CH2OSO2OH. Appearance: Clear colourless oily liquid.Yellow to dark brown in colour when impure. The Ph value of 0.001M Sulphuric acid (H4 SO4) Solution is about the same as that of 0.1M ethanoic acid (CH3COOH) solution. Benzene reacts with CH 3 Cl in the presence of anhydrous AlCl 3 to form. When concentrated sulphuric acid reacts with sugar it acts as a dehydrating agent; removing water from the sucrose. 1) As a Dehydrating Agent. H 2 S 2 O 7 (l) + H 2 O(l) → 2H 2 SO 4 (b) Directly dissolving sulphur trioxide in water is not possible due to highly exothermic nature of the reaction.Acidic vapors are formed.Oleum is reacted with water to form conc. CAS Registry No. In this reaction sulphuric acid acts as a dehydrating agent. Give an example of a salt for each of the two series. sulphuric acid to form pyrosulphuric acid known as oleum or fuming sulphuric acid. (b) Concentrated sulphuric acid is both an oxidizing agent and a non-volatile acid. Oxidising agent: This process is called nitration. The concentrated sulphuric acid can act both as an acid and as an oxidising agent. (a) O3 (b) KMnO4 (c) H2O 2 (d) K2Cr2O7 Question 4. Selina solutions for Concise Chemistry Class 10 ICSE chapter 11 (Sulphuric Acid) include all questions with solution and detail explanation. (b) Concentrated sulphuric acid as. H 2 SO 4 + H 2 S →2H 2 O + SO 2 + S can remove water from many substances such as sugar, paper, wood, copper sulphate etc. Concentrated sulfuric acid oxidises many metals with the formation of sulphur dioxide and water. Write an equation for each property. The heat from these reactions may ignite the wood, sugar or organic matter. Sulfuric acid is available in many grades ranging from electrolyte grade (33 weight percent) for batteries, to 93 weight percent (66 deg Baume), 98 weight percent, and 20-22 weight percent … H 2 SO 4 + SO 3 → H 2 S 2 O 7 (8) Oxidising agent. A oxidising agent oxidising agent B oxidising agent reducing agent C reducing agent oxidising agent D reducing agent reducing agent 21 Why is ethanoic acid described as a weak acid? Sulphuric acid is a dibasic acid and forms two series of salts with sodium hydroxide. In one of its most familiar applications, sulfuric acid serves as the electrolyte in lead-acid storage batteries. However, since calcium ion is present in natural water sources more abundantly than barium and strontium ions, CaSO 4 is a greater problem. Calcium sulphate is more soluble than BaSO 4 and SrSO 4 . Answer 11 (a) Sulphuric acid is powerful dehydrating agent on account of its strong affinity towards water. H 2 SO 4 is an oxidizing agent and a non volatile acid. For example: sucrose (cane sugar) is oxidised to oxalic acid by nitric acid. In above reaction, Zn is oxidized to Zn ++ and H + of the acid is reduced to H 2 gas showing sulphuric acid contains hydrogen. Each to illustrate the above mentioned properties of sulphuric acid. 800+ SHARES. H 2 SO 4 → H 2 O + SO 2 + [O] In above reaction, conc.H 2 SO 4 is acting as an oxidizing agent and decomposes to nascent oxygen showing sulphuric acid contains oxygen. But if the sulphuric acid is hot and concentrated, then it can undergo reduction. D It reacts … You end up with a black carbon residue. Nitric acid also reacts with organic compounds. From the above reaction it is evident that 8 moles of H+ ions is required per mole of MnO4- so sulphuric acid … Use cold concentrated acid and little or no action occurs. Concentrated sulphuric acid is an excellent dehydrating agent and is widely used for drying such gases which do not react with it. Chars wood, sugar and many other organic materials on contact. The concentrated sulphuric acid gives a hydrogen ion to the halide ion to produce a hydrogen halide. Hot concentrated sulphuric acid is a moderately strong oxidising agent. On the reaction 2Ag + 2H2 S04 ———-> Ag2 S04 + 2H20 + S02 sulphuric’acid acts as (a) an oxidizing agent (b) a reducing agent (c) a catalyst (d) an acid as well as an oxidant Question 5. Answer: Sulphuric acid removes water of crystallization. C 12 H 22 O 11 + 36 HNO 3 –> 6 (COOH) 2 + 36NO 2 + 23 H 2 O In the presence of sulphuric acid, nitric acid reacts with aromatic compounds forming nitro compounds. • Sulphuric acid acts as a catalyst in many chemical reactions carried out industrially. toluene. Concentrated sulphuric acid acting as an acid. The carbon produced by dehydration is then oxidised to carbon dioxide and carbon monoxide. xylene. Sulfuric acid (American / IUPAC spelling) or sulphuric acid (traditional / British spelling), also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula H 2 SO 4.It is a colourless and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic. H 2 SO 4 + H 2 S → 2H 2 O + SO 2 + S↓ (c) Concentrated sulphuric acid has high boiling point (356°C). Also, learn to describe reactions that reveal that concentrated sulphuric acid is a dehydrating agent. In its reactions, sulphuric acid H SO can behave as an acid, an oxidising agent and as a dehydrating agent. Describe, using examples, the reactions of sulfuric acid acting as: An oxidising agent (put conc H2SO4 above arrows) Sulfuric acid is a moderately strong oxidising agent. 800+ VIEWS. As concentrated H2SO4 is an oxidizing agent for copper. This will clear students doubts about any question and improve application skills while preparing for board exams. This reaction is known as Friedel-Craft's alkylation of benzene. Reactivity. Since the reaction is exothermic (heat-generating), much of the water is boiled off as steam. With our ICSE Class 10 Chemistry textbook solutions, learn the key differences between concentrated sulphuric acid and dilute sulphuric acid. The oxidising character of H 2 SO 4 is due to the fact that it decomposes to give nascent oxygen. ... C12H22O11 (sugar) + H2SO4 (sulfuric acid) → 12 C (carbon) + 11 H2O (water) + mixture of water and acid. 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