Take about 3 mL of ethanol in a test tube and warm itgently in a water bath.n Add a 5% solution of alkaline potassium permanganatedrop by drop to this solution.n Does the colour of potassium permanganate persist whenit is added initially?n Why does the colour of potassium permanganate notdisappear when excess is added?
Question
Take about 3 mL of ethanol in a test tube and warm itgently in a water bath.n Add a 5% solution of alkaline potassium permanganatedrop by drop to this solution.n Does the colour of potassium permanganate persist whenit is added initially?n Why does the colour of potassium permanganate notdisappear when excess is added?
Solution
-
First, measure about 3 mL of ethanol and pour it into a test tube.
-
Next, prepare a water bath to gently warm the test tube. This can be done by filling a larger container with hot water and then placing the test tube inside, making sure the water level is about the same as the ethanol in the test tube.
-
Once the ethanol is warm, slowly add a 5% solution of alkaline potassium permanganate drop by drop into the test tube.
-
Observe the color of the solution. Initially, when potassium permanganate is added, it may not persist because it reacts with the ethanol. This reaction causes the purple color of potassium permanganate to disappear.
-
However, if you continue to add an excess of potassium permanganate, you will notice that the color does not disappear. This is because all the ethanol has already reacted, and there is no more ethanol left for the potassium permanganate to react with. Therefore, the purple color of the excess potassium permanganate persists.
Similar Questions
To an aqueous solution of a salt, acidified potassium permanganate is added and the purple colour of potassium permanganate is discharged. It indicates that the solution may containFe2+NO3–Be2+Sn2+
The even distribution of particles of potassium permanganate in water shows that the particles...
A dilute ferrous sulphate solution was gradually added to a beaker containing acidified potassium permanganate solution. The light purple colour of the solution faded and finally disappeared. Which of the following is the correct explanation for the observation?
A chemist prepares a solution of potassium permanganate KMnO4 by measuring out 7.6mg of potassium permanganate into a 50.mL volumetric flask and filling the flask to the mark with water.Calculate the concentration in /molL of the chemist's potassium permanganate solution. Be sure your answer has the correct number of significant digits.
Take about 2 mL of dilute NaOH solution in a test tube and addtwo drops of phenolphthalein solution.n What is the colour of the solution?n Add dilute HCl solution to the above solution drop by drop.n Is there any colour change for the reaction mixture?n Why did the colour of phenolphthalein change after the additionof an acid?n Now add a few drops of NaOH to the above mixture.n Does the pink colour of phenolphthalein reappear?n Why do you think this has happened?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.