Since H2SO4 is an oxidizing agent, it oxidizes HI (produced in the reaction to I2). As a result, the reaction between alcohol and HI to produce alkyl iodide cannot occur. Therefore, sulphuric acid is not used during the reaction of alcohols with KI.
Does sulphuric acid react with potassium iodide?
Same it does also with the sulphuric acid. So instead of providing an favourable acidic condition, sulphuric acid reacts with the Iodide so leading into undesirable product formation.
Why sulphuric acid is not used during the reaction?
In the presence of a dilute acid, KI would produce HI. If the acid used is sulphuric acid, the HI gets used up to produce I2 gas. As a result, the action of alcohol on acid to produce alkyl iodide cannot occur. Therefore, sulphuric acid is not used for this reaction.
What happen when K is heated with concentrated h2 S o4?
When ehanol is heated with concentrated sulphuric acid at 443 K, dehydration takes place and ethene is formed.
Why HBr and HI Cannot be prepared satisfactorily by the treatment of metal bromides or iodides with conc H SO 2 4 and how TYPE This difficulty can be solved?
HBr and and HI can’t be prepared by treating conc. H2 SO4 with Bromide and Iodide as HBr and HI are strong reducing agents and they reduce H2SO4 into SO2 and themselves into Br2 and I2 respectively. i.e.
Why is sulphuric acid not used in the lab preparation of carbon dioxide?
Dilute sulphuric acid reacts with calcium carbonate. But it is not used because the calcium sulphate which is formed during the reaction is insoluble in water. It covers the marble chips and stops the reaction.
Which gas is liberated when formic acid is dehydrated using sulphuric acid?
Complete answer: When you heat formic acid in presence of concentric sulphuric acid, you get a mixture of carbon monoxide gas and water vapors. In the above reaction, the concentrated sulphuric acid acts as a dehydrating agent. It removes a molecule of water from formic acid and carbon monoxide gas is left behind.
When solid potassium iodide is heated with concentrated sulphuric acid a Coloured fume Y is liberated?
When solid potassium iodide is heated with concentrated sulphuric acid, a coloured fume, Y is liberated. When aqueous silver nitrate is added to aqueous potassium iodide, a precipitate Z is formed.
When ethanol is dehydrated by heating it with conc H2SO4 at 433 K the product formed is?
Ethene
Ethene is formed when ethanol at 443 K is heated with excess of concentrated sulphuric acid.
Why H2SO4 Cannot be used to prepare HBr from bromide?
Hydrogen bromide is a heteronuclear diatomic molecular compound having chemical formula as $ HBr $ .But concentrated sulphuric acid is not used here because hydrogen bromide is a strong reducing agent and it reduces sulphuric acid to sulphur dioxide and oxidises itself and forms a molecule of bromine.
Why can’t we prepare HBr by heating KBr with sulphuric acid?
H2SO4 when concentrated act as oxidising agent and oxidises KBr and KI to Br2 and I2 respectively.
Why HBr Cannot be prepared as HCl by using concentrated sulphuric acid?
All the halogen acids are colorless in nature possessing pungent suffocating smell. They are acidic in the order. HBr and HI can’t be prepared like HCl by using concentrated sulphuric acid because HBr and HI being a strong reducing agent, reduces concentrated sulphuric acid to sulphur dioxide.
Why sulphuric acid is not used in preparation of hydrogen?
Hot concentrated sulphuric acid not used in the preparation of hydrogen because it will produce sulphur dioxide.
What happens when sulphuric acid is used instead of hydrochloric acid in the preparation of carbon dioxide gas?
Dilute sulphuric acid is not used in the laboratory preparation of CO2 gas, why? Ans: Dilute sulphuric acid is not used for laboratory preparation of carbon dioxide gas because calcium sulphate so produced being insoluble covers the remaining part of the marbles and does not allow further reaction.
Why is dilute H2SO4 used in the lab preparation of hydrogen gas?
Dilute sulphuric acid will react to produce hydrogen gas. Increasing the concentration will increase the rate of reaction. Since the product is in another phase (hydrogen is a gas) too rapid a reaction brings a risk of overpressurization and explosion.
What happens when formic acid reacts with sulphuric acid?
When formic acid, [HCOOH] is reacting with concentrated Sulphuric acid then the formic acid will be dehydrated and sulphuric acid will be hydrated.
When bromide is heated with conc H2SO4 the gas liberated is?
Hint: KBr is an alkali metal halide. When it reacts with concentrated acid, we expect the halide to be liberated. Thus, the reddish-brown coloured gas we can see is of bromine.
Which of the following gives carbon with conc sulphuric acid?
Explanation: H2SO4 11H2O+12C.
Why is sulphuric acid a good oxidising agent?
In the case of sulfuric acid, it accepts electrons. It is a good oxidizing agent because of its positively charged sulfate ions SO4- that bind positively charged electrons. Sulfuric acid is not as strong an oxidizing agent as elemental fluorine, nitric acid, or potassium permanganate.
Why H2SO4 acid is used in the redox reaction?
In sulphuric acid, H2SO4, the oxidation state of sulphur is +6 which is highest possible oxidation state of S in its compounds. So, it can not be further oxidised. So, in redox titrations, in which a strong oxidising agent like KMnO4 is employed, H2SO4 can be used to provide acidic medium.
Why is sulphuric acid oxidizing agent?
H2SO4 be aves as an oxidising agent because cone. H2SO4 whes hated decomposes to give nascent oxygen which acts as a strong oxidising agent.
Contents