Q16 of 270 Page 79

Two drinks P and Q gave acidic and alkaline reactions, respectively. One has a pH value of 9 and the other has a pH value of 3. Which drink has the pH value of 9?

Q has pH value of 9, as the pH is between 7 and 14, indicating it as alkali.

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14 Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid? 15 Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will tum litmus solution from blue to red and which will tum phenolphthalein from colourless to pink? 17 Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic? 18 Fill in the following blanks with suitable words:

(a) Acids have a pH.................than 7.


(b) Alkalis have a pH.............. than 7.


(c) Neutral substances have a pH of ...............


(d) The more acidic a solution, the ................... the pH.


(e) The more alkaline a solution, the.................... the pH.