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A liquid-liquid extraction was performed by a student to remove caffeine from a freshly brewed pot of coffee. In the separatory funnel, the student added the coffee and extracted the caffeine using dichloromethane (d = 1.33g/mL). After shaking and venting, two layers formed, the student then proceeded to drain the bottom layer into a flash labeled flask #1. Which of the following is the best explanation as to what the student should do next?
Discard the contents of flask #1 as it does not contain the product, instead add the remaining liquid in the separatory funnel to a new flask and proceed to extract the caffeine.
Add a drying agent to flask #1, filter, then evaporate to obtain solid caffeine.
Add acid to the remaining contents in the separatory funnel, then add to a new flask
Add water to flask # 1 and evaporate
In general, for an acid or base liquid-liquid extraction we generate some type of salt. We take advantage of the fact that this salt is ____ soluble in the water because it is ____.
less, polar
less, nonpolar
more, nonpolar
more, polar
Short Paper on Cross-cultural Opportunities and Conflicts in Canada.
Sociology are very fundamental in nature. Role strain and role constraint speak about the duties and responsibilities of the roles of people in society or in a group. A short theory about Darwin and Moths is also answered.
This review will help the reader understand the social work profession through different concepts giving the glimpse of why the social work profession might have drifted away from its original purpose of serving the poor.
Schizophrenia does not really have just one single cause. It is a possibility that this disorder could be inherited but not all doctors are sure.
Individual Assignment : Two Models Handout and Rubric, This paper will allow you to understand and evaluate two vastly different organizational models and to effectively communicate their differences.
The following report includes the description about the organization, its strategies, industry analysis in which it operates and its position in the industry.
In this study, we examine how gasoline price volatility and income of the consumers impacts consumer's demand for gasoline.
Economics thesis undergrad 4th year paper to write. it should be about 22 pages in length, literature review, economic analysis and then data or cost benefit analysis.
The paper aims to highlight the global trends in countries and regions where 3G has already been introduced and propose an implementation plan to the telecom operators of developing countries.
Prepare the power point presentation for the case: Santa Fe Independent School District
Information literacy is critically important in this contemporary environment
Write a definition for associative property of multiplication.
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