7. You obtained a titration curve for an unknown weak acid by
titrating 25.00 mL of the acid with 0.100 M NaOH(aq) (see figure).
Answer the following questions about this weak acid.
7 You Obtained A Titration Curve For An Unknown Weak Acid By Titrating 25 00 Ml Of The Acid With 0 100 M Naoh Aq See 1 (123.5 KiB) Viewed 31 times
a) What is the initial concentration of the weak acid?
b) There are three ways to estimate the Ka of a weak acid from a
titration curve:
(1) with the initial pH, (2) with the pH at the midpoint (halfway
point), and (3) with the pH at the equivalence point. Show all
three methods.
14 12 Equivalende point 10 P=10 8 DH-26 PH Halfway point 6 Initial Condition pH=42 2 0 0 10 12.5ml 25ml 20 30 40 Volume NaOH(aq) Added (mL) 50
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