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CBSE Class 10 Answered

A drop of phenolphthalein was added to 1 ml of water and a drop of Noah solution was added to it. Explain the observations   
Asked by Radhanirwan.00 | 10 Oct, 2018, 07:43: PM
answered-by-expert Expert Answer
The pH of neutral water solution is 7. 
And phenolphtalein shows pink colour on above pH 8 and NaOH has 13 hence it will sow pink colour on addition 
 
Hence on adding water drops to phenolphthalein there is no change in colour but after addition of drops of NaOH it changes its colour from colourless to pink colour.
Answered by Ramandeep | 12 Oct, 2018, 12:35: PM
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