The pKb of ammonia is 4.75 at 25°C. Answer. As shown in part (b) in Figure 17.4.3, the titration curve for NH3, a weak base, is the reverse of the titration curve for acetic acid. In particular, the pH at the equivalence point in the titration of a weak base is less than 7.00 because the titration produces an acid.. Adding the titrating solution to the titrand’s solution. Using the red stopper at the bottom of the buret, slowly add the titrating solution to the titrand’s solution one drop at a time. It is important to only let the titrating solution be added one drop at a time because the titration reaction can be very sensitive.
Titrations
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Step 1: calculate the average titre without including the rough titration (28.50 mL). average titre = 26.75 + 26.70 +26.80 3 a v e r a g e t i t r e = 26.75 + 26.70 + 26.80 3. averagetitre = 26.75mL a v e r a g e t i t r e = 26.75 m L. Step 2: write a balanced chemical equation.. Equivalence point: point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution. At the equivalence point in an acid-base titration, moles of base = moles of acid and the solution only contains salt and water. Diagram of equivalence point. Acid-base titrations are monitored by the change.
