In the titration experiment you carried out in your CHM 108 practical, the colour change of yoursolution when using the phenolphthalein indicator isA. Colourless to PinkB. Pink to ColourlessC. Pink to RedD. Pink to Yellow
Question
In the titration experiment you carried out in your CHM 108 practical, the colour change of yoursolution when using the phenolphthalein indicator isA. Colourless to PinkB. Pink to ColourlessC. Pink to RedD. Pink to Yellow
Solution
In a titration experiment using phenolphthalein as an indicator, the color change observed is from colourless to pink (Option A). This is because phenolphthalein is colorless in acidic solution and turns pink in basic or alkaline solution. When the solution being titrated reaches the endpoint (the point at which all of the analyte has reacted with the titrant), the phenolphthalein will cause the solution to change from colourless to pink.
Similar Questions
The colour of phenolphthalein indicator in dilute HNO isA. colourlessB. orangeC. pinkD. purple
WHICH OF THE FOLLOWING IS USED AS AN INDICATOR IN THE TITRATION OF A STRONG ACID AND A WEAK BASE?a.Phenolphthaleinb.Methyl orangec.Fluoresceind.Thymol blue
The best indicator for the detection of end point in titration of a weak acid and a strong base is :-Methyl orange (3.1 to 4.4)Methyl red (4.2 to 6.3)Bromothymol blue (6 to 7.6)Phenolphthalein (8.2 to 10)
The commonly used indicators for the titration of the mixture of strong and weak bases against astrong acid are the following exceptA. PhenolphthaleinB. Methyl redC. Alizarin blueD. Methyl orange
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?
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