(a) You are about to prepare three solutions of 0.5 M KI, 0.01 M K2S2O8, and 0.01 M Na2S2O3*5H2O in 250 mL volumetric flasks. - Describe how you will go about this, i,e, explain all steps of weighing of solutes, volumetric measurements (filling up with deionised water) ect. Calculate what mass of solute you will need in each of solutions mentioned above that you need to prepare. Show all calculations steps. (b) You are also tasked to fill burettes with the above-mentioned solutions, however, after filling up the solutions, you realised that there is a bubble towards the bottom tip inside the burette. Is it wise to continue with the experiment, while there is a bubble, if NOT explain why. (c) According to the manual's Experimental procedure, one conical flask (flask 1) contains a mixture of 20 mL of the KI solution plus 10 mL of the Na2S2O3 solution, while in the second flask (flask 2) there is 20 mL of the K2S2O8 solution with added five drops of starch solution. Why can't you add drops of starch solution is flask 1. Explain (d) Explain why it is so important to allow the two conical flasks (i,e flask 1 and 2) to separately reach the required reaction temperature in a water bath, before the two can be mixed together for the reaction to start. (e) According to your knowledge of chemical kinetics, given the two reaction temperatures, i.e, the higher temperature (30°C) and the lower temperature (in ice, 0°C), which one will react the slowest? Explain why.
(a) You are about to prepare three solutions of 0.5 M KI, 0.01 M K2S2O8, and 0.01 M Na2S2O3*5H2O in 250 mL volumetric flasks. - Describe how you will go about this, i,e, explain all steps of weighing of solutes, volumetric measurements (filling up with deionised water) ect. Calculate what mass of solute you will need in each of solutions mentioned above that you need to prepare. Show all calculations steps. (b) You are also tasked to fill burettes with the above-mentioned solutions, however, after filling up the solutions, you realised that there is a bubble towards the bottom tip inside the burette. Is it wise to continue with the experiment, while there is a bubble, if NOT explain why. (c) According to the manual's Experimental procedure, one conical flask (flask 1) contains a mixture of 20 mL of the KI solution plus 10 mL of the Na2S2O3 solution, while in the second flask (flask 2) there is 20 mL of the K2S2O8 solution with added five drops of starch solution. Why can't you add drops of starch solution is flask 1. Explain (d) Explain why it is so important to allow the two conical flasks (i,e flask 1 and 2) to separately reach the required reaction temperature in a water bath, before the two can be mixed together for the reaction to start. (e) According to your knowledge of chemical kinetics, given the two reaction temperatures, i.e, the higher temperature (30°C) and the lower temperature (in ice, 0°C), which one will react the slowest? Explain why.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 98AP
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Transcribed Image Text:(a) You are about to prepare three solutions of 0.5 M KI, 0.01 M K2S2O8, and 0.01 M
Na2S2O3*5H2O in 250 mL volumetric flasks.
-
Describe how you will go about this, i,e, explain all steps of weighing of solutes,
volumetric measurements (filling up with deionised water) ect.
Calculate what mass of solute you will need in each of solutions mentioned above
that you need to prepare. Show all calculations steps.
(b) You are also tasked to fill burettes with the above-mentioned solutions, however, after
filling up the solutions, you realised that there is a bubble towards the bottom tip inside
the burette. Is it wise to continue with the experiment, while there is a bubble, if NOT
explain why.
(c) According to the manual's Experimental procedure, one conical flask (flask 1) contains a
mixture of 20 mL of the KI solution plus 10 mL of the Na2S2O3 solution, while in the
second flask (flask 2) there is 20 mL of the K2S2O8 solution with added five drops of
starch solution. Why can't you add drops of starch solution is flask 1. Explain
(d) Explain why it is so important to allow the two conical flasks (i,e flask 1 and 2) to
separately reach the required reaction temperature in a water bath, before the two can
be mixed together for the reaction to start.
(e) According to your knowledge of chemical kinetics, given the two reaction temperatures,
i.e, the higher temperature (30°C) and the lower temperature (in ice, 0°C), which one will
react the slowest? Explain why.
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