Acid-Base Titrations

AP Chemistry· difficulty 2/5

NaOH titrated with HCl.

Why does pH start high and end low?

A
$HCl reacts with water before titration$
B
$Salt produced is basic$
C
$Phenolphthalein dissociates$
D
$Initially basic NaOH; HCl converts it to neutral salt and excess H+$
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Explanation

Initially the flask contains NaOH (high pH). HCl neutralizes it; past equivalence, excess HCl dominates and pH drops below 7.

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