Method 1 Fill a burette with the solution of NaOH(aq) of unknown concentration. Pipette 25.00 cm' of the standard solution of 0.10 mol dm3 HCI(aq) onto a clean conical flask. 3 Add a few drops of the indicator bromothymol blue solution to the conical flask and stand it on a white tile or, white paper. 4 Titrate the NaOH against the HCI, until the endpoint of the indicator is observed, and record the volume added from the burette. 5 Repeat the titration until final values within 0.05 cm3 are obtained. Results Volume NaOH Titration 1 Titration 2 Titration 3 end volume / cm3 + 0.05. 24.7 24.8 24.6 start volume / cm3 + 0.05 titre / cm3 + 0.10 24.7 24.8 24,6 average titre/ cm' ± 0.10 = 24.7 Also, record your qualitative data. Analysis Calculate the number of moles of HCI that reacted. By reference to the reacting ratio of HCl and NaOH, deduce the number of moles of NaOH required to reach equivalence.

Method 1 Fill a burette with the solution of NaOH(aq) of unknown concentration. Pipette 25.00 cm' of the standard solution of 0.10 mol dm3 HCI(aq) onto a clean conical flask. 3 Add a few drops of the indicator bromothymol blue solution to the conical flask and stand it on a white tile or, white paper. 4 Titrate the NaOH against the HCI, until the endpoint of the indicator is observed, and record the volume added from the burette. 5 Repeat the titration until final values within 0.05 cm3 are obtained. Results Volume NaOH Titration 1 Titration 2 Titration 3 end volume / cm3 + 0.05. 24.7 24.8 24.6 start volume / cm3 + 0.05 titre / cm3 + 0.10 24.7 24.8 24,6 average titre/ cm' ± 0.10 = 24.7 Also, record your qualitative data. Analysis Calculate the number of moles of HCI that reacted. By reference to the reacting ratio of HCl and NaOH, deduce the number of moles of NaOH required to reach equivalence.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.48QAP

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