Three liquids, P, Q and R are added to a mixture of hydrochloric acid and Universal Indicator solution. The following observations are made. P. the colour of the indicator turns purple. Q. the colour of the indicator does not change. R. there is effervescence and the indicator turns blue. What are P, Q and R?
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(Q) is:turmeric
(R) is:flower of hydrangea plant
when the litmus solution is neither acidic nor basic, it's colour is purple
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P= strong alkali
Q= strong acid
R= weak alkali
Explanation:
Universal indicator is a solution that has a wide range of indication from strong acids to strong bases.
When we have a mixture of hydrochloric acid and universal indicator which will be red in color because hydrochloric acid is a strong acid and the indicator will turn red.
- When the liquid P is added to this mixture then it turns purple, which is due to the universal indicator that turns purple when a strong alkali is added to it.
- When the liquid Q is added to the mixture it does not changes its color and remains red as it was initially that means the liquid Q is strongly acidic in nature and remains red.
- When the liquid R is added to the mixture it turns blue due to the universal indicator turning blue on mixing with weak alkali.
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TOPIC: universal indicator
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