Shown above are two titration curves. Identify: ...which titration, a or b, invo

Question

Shown above are two titration curves. Identify: ...which titration, a or b, involves a strong acid, and which involves a weak acid. ...the equivalence point in each case - specify both volume and pH. ...the molarity of the acid (in either case) if the base is being added to a 40-mL sample of acid solution. ...the Ka of the weak acid, based on the idea that half way to the equivalence point (in terms of volume) a weak acid is roughly half deprotonated. Thus, amounts of HA and A^- in solution are the approximately the same, and they drop out of the equilibrium expression, leaving only Ka = [H^+].

Explanation / Answer

(a) Curve 'a' indicates strong acid (because starting pH = 1, low) and 'b' indicates weak acid (because pH = 3, high)

(b) At equivalence point,

Strong acid, V = 25.0 mL and pH = 7

Weak acid, V = 25.0 mL and pH = 9

(c)

M1 V1 = M2 V2

M1 = 0.100 * 25.0 / 40 = 0.0625 M

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