ï»¿ Acid-base titration curves

Here is a titration curve of an acid per $NaOH\; 0.1\; M$ recorded using a pH meter:

What kind of acid is it ?

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It is a weak acid.

Determine the base volume added at the equivalence point! (Notice the tangent method to find the E.P. pixel accurately!).

$V_e\approx 10.0\;mL$.

Find the $pK_a$ of the acid !

$pK_a\approx 4.8$.