Chemistry lab questions

timer Asked: Jun 14th, 2018
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Question description

Please type lab 8 data and type and answer post lab questions. lease type lab data and type and answer post lab 1 questions.

Chemistry lab questions
Chemistry lab questions
Chemistry lab questions
Chemistry lab questions
Chemistry lab questions

Tutor Answer

School: Rice University

What does the technique of chromatography allow you to do?What’s the meaning and utility of an Rf value? What would you expect to influence an Rf value?What are the developing reactions that allow the identification of Ni2+ and Cu2+?What forces cause the eluting solution to move along the chromatographic support material?Why is it important to mark the solvent front immediately?If the solvent front is 68 mm and the ring front of an unknown is 48 mm from the original spot, what’s the Rf value?Would you expect changing the solvent to change the Rf value? Why or why not?Suggest simple reasons why the Ni2+ and Fe3+ ions have different Rf values?Is it necessary that compound be colored to be separated by chromatography?Why should the petri dish or beaker be covered during development of the chromatogram? Chromatography allows us to separate a mixture into its constituents, due to the relative difference in polarity or size, one can get info about the mixture. Rf value is defined as the ratio between the distance traveled by the solute to the distance traveled by the solvent for certain paper, in certain amount of time. Rf value is influenced by the type of the solute, so different solutes will have different Rf for the same solvent, and it also the type of solvent, as same solutes have different Rf for different solvents, also if solute and solvent are the same, and less likely but it could happen if we change the type of the paper on which we do the experiment, this could affect the Rf...

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