3 mL of ethanol is taken in a test tube and warmed gently in a water bath. A 5% solution of alkaline potassium permanganate is added first drop by drop to this solution, then in excess.(I) How is 5% solution of KMn04 prepared?(ii) State the role of alkaline potassium permanganate in this reaction. What happens on adding it in excess?(iii) Write chemical equation of this reaction.
(i) 5% solution of KMn04 is prepared by dissolving 5 grams of KMnO4 in 100 ml of water.
(ii) Alkaline potassium permanganate is adding oxygen to alcohol and converts it to acid. Hence, it acts as an oxidizing agent. When is KMn04 is added, initially colour disappears because coloured permanganate ions of potassium permanganate are consumed to oxidize ethanol.
When an excess of KMn04 is added, colour does not change because there is no more alcohol left for the reaction.
(iii) The chemical equation of this reaction is given below:
$C_2H_5OH(Ethanol) \xrightarrow{alkaline\ KMnO_4 +\ Heat}CH_3COOH (acetic\ acid)$
Related Articles
- What happens when 5% alkaline potassium permanganate solution is added drop by drop to warm propyl alcohol (propanol) taken in a test tube? Explain with the help of a chemical equation.
- (a) What would be observed on adding a 5% alkaline potassium permanganate solution drop by drop to some warm ethanol in a test-tube? Write the name of the compound formed during the chemical reaction. Also write chemical equation of the reaction which takes place.(b) How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property?
- What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
- When potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.(a) What is the colour of this precipitate? Name the compound precipitated.(b) Write the balanced chemical equation for this reaction.(c) List two types of reactions in which this reaction can be placed.
- What is a homologous series of compounds? List any two characteristics of a homologous series.What would be observed on adding a 5% alkaline potassium permanganate solution drop by drop to some warm ethanol in a test tube?Write the name of the compound formed during the chemical reaction.How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property?
- Lead nitrate solution is added to a test tube containing potassium iodide solution.(a) Write the name and colour of the compound precipitated.(b) Write the balanced chemical equation for the reaction involved.(c) Name the type of this reaction justifying your answer.
- Ethene is formed when ethanol at 443 K is heated with excess of concentrated sulphuric acid. What is the role of sulphuric acid in this reaction? Write the balanced chemical equation of this reaction.
- Write the structural formula of ethanol. What happens when it is heated with excess of conc. H2SO4 at 443 K? Write the chemical equation for the reaction stating the role of conc. H2SO4 in this reaction.
- The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:(a) potassium dichromate solution and sulphur dioxide(b) potassium permanganate solution and sulphur dioxide(c) potassium permanganate solution and lemon juice(d) potassium dichromate solution and carbon dioxide
- What is observed when a pinch of sodium hydrogen carbonate is added to 2 mL of acetic acid taken in a test tube? Write chemical equation for the reaction involved in this case.
- When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
- (a) State the various characteristics of chemical reactions.(b) State one characteristics each of the chemical reaction which takes place when:(i) dilute hydrochloric acid is added to sodium carbonate (ii) lemon juice is added gradually to potassium permanganate solution (iii) dilute sulphuric acid is added to barium chloride solution (iv) quicklime is treated with water(v) wax is burned in the form of a candle
- (a)What happens when ethanol is oxidised with alkaline potassium permanganate (or acidified potassium dichromate)? Write the equation of the reaction involved.(b) Choose those compounds from the following which can turn blue litmus solution red: HCHO, CH3COOH, CH3OH, C2H5OH, HCOOH, CH3CHO Give reasons for your choice.
- On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, a white precipitate is obtained.(a) Write a balanced chemical equation of the reaction involved(b) What other names can be given to this precipitation reaction?(c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
- A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of chemical reaction?/p>
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies