Data Sheet 1 pH(s) at which meter was standardized: Il. Titrating HCI Solution w

Question

Data Sheet 1 pH(s) at which meter was standardized: Il. Titrating HCI Solution with NaOH Solution concentration of HCl solution, M ,1002 concentration of NaOH solution, M OIOC first determination second determination initial buret reading, mL 2 00 mL initial buret reading, mL 0,00 m buret reading, mL volume NaOH added, mL buret reading, ml volume NaOH added, mL pH pH 0.98 00 mL 0On L o.es 0. 0m O.OmL 910 4.OmL 2mL 0:79 5.0mL 5.00mL LO 1oomL 2 m 292 1.omL 2.00mL LI3 12.0mL 2mL 1.00 13.0mL 2.00 mL 1.80 2o.omL Zm a.0 21.0ml 2.00m 3.al 22.0mL am 34 23.0mL 2.00mL

Explanation / Answer

QUESTION 01

Both titrations are done with the strong or weak acid being in the titration flask and NaOH in the burette. Until the eqivalence point acid is present in the flask and the pH of the acid is measured. This is different for strong and weak acids, due to complete and incomplete dissociation. However, beyond the equivalence point all acid has been neutralized and an excess of NaOH is present. Beyond the equivalence point, the pH is due to NaOH in both cases. Thus the pH curve is similar for a strong acid and a weak acid beyond the equivalence point.

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