on adding a few drops of universal indicator in three colourless solution X Y and Z test tube a student observed the changes in colours green in X and red in Y and blue in Z
(a)X Y and Z in increasing order of their PH value
(b)which one of the three X Y and Z will change the colour of phenolphtalein ?why?
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Answered by
22
a. Y X Z . ( INCREASING ORDER OF THEIR PH VALUE)
b. Z will change the color of phenolphthalein to pink color because it is basic in nature.
Answered by
11
(a) X Y and Z in increasing order of their PH value are Y < X < Z.
- X shows green colour ⇒ X is neutral ⇒ its pH is 7
- Y shows red colour ⇒ Y is acidic ⇒ its pH is <7
- Z shows blue colour ⇒ Z is basic ⇒ its pH is >7
(b) Z will change the colour of phenolphtalein.
- Phenolphthalein is originally colourless.
- But in basic mediums in pH range of around 8.2-10, it turns pink.
- Since Z has a pH>7 and only it is basic among the three given solutions, so it will chane the colour of phenolphthalein
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