Question
Give the uses and example of acid base indicator.
✓
Answer
Phenolphtalien, bromothimol blue are acidbase indicator. With help of this in acid-base Fitration, end point is calculated.
Ex. : Phenolphthalein is colourless in acidic medium and pink in basic medium.
$
\begin{array}{l}
Hph(aq)+H_2 O(l) \rightleftharpoons H_3 O^{+}(aq) \\
\text { Conjugate } \\
\text { Colourless }
\end{array}+\begin{array}{c}
\text { acid }
\end{array}
$
Ex. : Phenolphthalein is colourless in acidic medium and pink in basic medium.
$
\begin{array}{l}
Hph(aq)+H_2 O(l) \rightleftharpoons H_3 O^{+}(aq) \\
\text { Conjugate } \\
\text { Colourless }
\end{array}+\begin{array}{c}
\text { acid }
\end{array}
$
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