Qualitative Analysis Essays - Silver Compounds, Analytical Chemistry

Qualitative Analysis Essays - Silver Compounds, Analytical Chemistry Qualitative Analysis Qualitative Analysis Introduction: Qualitative analysis is used in the determination of the identity of a substance. It is different from quantitative analysis, which deals with the determination of the amount of a substance. In this experiment, qualitative analysis techniques are used to determine whether or not a sample contains a certain ion. When using this method, an unknown and a reactant are mixed. The result of the reaction leads to a conclusion about the presence or absence of certain ions in the unknown. Many ions react in similar ways, and although the addition of one reagent to an unknown may not identify the ion, it limits the possibilities as to what the ion could be. A sequence of reactions used to analyze a sample is called a scheme, and it usually requires a large number of reagents and separation steps. For this experiment, the unknown may contain anywhere from 2 to all of the following cations and anions: Cations Anions Ag+ Cl- Ba2+ SO42- Fe3+ PO43- Cu2+ Cr3+ The following reagents are used to identify the ions: 1M H2SO4 2M HCl 2M NH4OH (labeled as NH4+) 2M NaOH .1M Ba(NO3)2 (labeled as .1M Ba2+) .1M AgNO3 (labeled as .1M Ag+) The first four are used to identify the cations, and the last two, used in conjunction with the first four, are used to identify the anions. The identification of the ions is mainly based on solubilities. This means that something must be known about the solubility characteristics of the different ions in the presence of the available reagents. The point of the first part of the experiment is to learn which reagents cause the ions to form precipitates, and which reagents dissolve the precipitates formed by the ions. This information is used to make the flow charts for the identification on the unknown ions. For example, it is important to know that a certain reagent will dissolve the precipitate formed by one ion, while it will not dissolve the precipitate formed by another ion. This can be used to distinguish between two different precipitates present in a solution, or to confirm which ion formed the precipitate and therefore was present in the solution. When carrying out the reactions, avoid adding an excess of reagent to the solution. This is because some precipitates redissolve in an excess of the reagent. Therefore, in cases where one drop of reagent produces a precipitate, 3 or more drops could completely dissolve the precipitate without it ever being visible to the eye. This would cause a large error in the scheme developed to identify the unknown ions. Experimental: The first part of the experiment consists of reacting the cations and anions with the reagents in order to see what the reaction will result in (precipitate or no precipitate). The cations were each reacted with the first four reagents listed in the introduction (H2SO4, HCl, NH4+, and NaOH). Then, the anions were each reacted with Ba2+ and Ag+. This was done by placing 2 drops of the ion in the test tube and then adding 2 drops of reagent. Each cation was reacted with each of the 4 reagents before moving on to the next cation to be tested. Prior to performing the reactions, a chart was made like the one in the data and calculations section. As each reaction was performed, the chart was filled in with the observation of what happened. If there was no change, NR was written in the chart for no reaction. If a precipitate formed, the color of the precipitate was written in the chart. If there was no precipitate but there was a color change in the solution, that was also recorded. As each reaction was carried out, it was sometimes difficult to determine whether a precipitate formed or not. If there was uncertainty, the test tubes had to be placed into the centrifuge in order to separate the precipitates from the solution. There are some very important things to remember when using the centrifuge. First, when tubes are placed in the centrifuge, a tube with an approximately equal volume of solution should be placed exactly opposite each sample tube to counterbalance it (use a test tube filled with an equivalent amount of water if necessary). Second, the centrifuge should come to a stop before it is opened and the test

A Funny Thing About William

A Funny Thing About William A Funny Thing About William A Funny Thing About William By Maeve Maddox US Social Security records indicate that the five most popular boys’ names in 1915 were John, William, James, Robert, and Joseph. In 2014, the top five were Noah, Liam, Mason, Jacob, and William. Not only has William remained a popular given name for 100 years, it has become doubly popular with the newcomer Liam. Liam is another version of William. Of Germanic origin, William is a compound of the Old German element vila, â€Å"will† or â€Å"resolution,† and helm, â€Å"helmet.† The name can be translated as â€Å"helmet of resolution† and occurs in different forms in different modern languages: German: Wilhelm English: William Irish: Ulliam (shortened to Liam) French: Guillaume Spanish: Guillermo Italian: Guglielmo Portuguese: Guilherme According to an article at MooseRoots (a genealogy research engine), in 2014, William was the most popular name given to newborn boys in 14 states, and Liam the top name in 17 states. The article suggests that William is more popular in the South and Liam in the North, but a closer look at the state-by-state statistics given on another part of the site shows that in several of the states in which Liam is number one, William is close behind. In eleven states, both William and Liam rank in the top three: Idaho Iowa Kansas Maryland Minnesota Missouri North Dakota Oklahoma Utah Virginia Wisconsin Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Vocabulary category, check our popular posts, or choose a related post below:85 Synonyms for â€Å"Help†3 Cases of Complicated HyphenationHow to Send Tactful Emails from a Technical Support Desk

Methods and Research in Communication Essay Example | Topics and Well Written Essays - 750 words

Methods and Research in Communication - Essay Example ar (2003) sought to explore the dynamics and challenges of the Middle East conflict and the role of the media in either contributing to the conflict or determining its course. One central question that is raised by the study involves the nature of contribution by the media in a cultural conflict. The study also questions the possibility of the existence of the element of bias in media coverage of conflict in the Middle East. Another important question raised by the study involves the capacity of the media to provide avenues that might be used for successful resolution of conflicts. Shinar (2003) adopted an explorative case study design with particular focus on the Palestinian-Israel conflict. The main hypothesis of the study was that the media involvement in conflict basically seeks ways of resolution. The study explored various models of conflict resolution in terms of their respective levels of efficacy to the Israel-Palestinian situation. Some of the historical incidents of the conflict were matched with the models with the objective of determining the patterns of the situation with the view of predicting possible scenarios for the future. The results of the study showed that the media involvement in conflict takes multiple forms and objectives. The media does not always engage in conflicts with the purpose of resolving the conflict. Sometimes the media basically seeks to transform the nature of conflict to match its own peculiar objectives. The study conducted by Melone, Terzis & Beleli (2005) focussed on the different roles that the media plays in a conflict situation. The hypothesis of the study was that the shape of any particular conflict is essentially determined by the manner in which the media participates in the conflict. The major assumption of the study is that responsible and ethical journalism will always produce positive results for the media whereas unethical journalistic practices have the capacity to escalate tensions and conflicts. The

Implementation of organisational identification Essay

Implementation of organisational identification - Essay Example Organizational identification is, according to Gemmiti (2008, 6), â€Å"an individual’s knowledge of belonging or membership to a group of members of the organization.† This knowledge of belonging to a particular organization is heavily based on emotions and has a great influence on an individual’s behavior. The identification comes with an employee’s understanding and realizing of how their personal goals and values are aligned with the goals and values of the organization. Finally, as such goals, norms and values are aligned, the employee adds that group membership to their overall self-concept (Meyer, Becker, and Van Dick 2006). Therefore, it can be said that organizational identification refers to whether an employee associates themselves with the organization in which they work and whether an employee views themselves as a part of the organization. According to Van Dick, Grojean, Christ, and Wieseke (2006), the concept of social identity can help to determine how organizational identification is related to organizational citizenship (Van Dick, Grojean, Christ, and Wieseke 2006). The two concepts, according to the researchers (Van Dick, Grojean, Christ, and Wieseke 2006), are positively related because individuals’ self-concepts are formed on the basis of belonging to certain organization. The stronger the feeling of belonging is, the more effort a person is willing to devote to the development of that organization. Therefore, in an organization, the more organizational goals and norms are in line with those of the individual, the more devoted that individual is to the organization. So, organizationa l commitment is also related to organizational identification. Organizational commitment is very important for employers because it determines the level of employee performance, job satisfaction, absenteeism and other productivity-related factors. This paper critically examines the concept of organizational identification, and analyzes how it is related to organizational performance, individual performance, job satisfaction and productivity. Literature review Organizational identification and organizational commitment An empirical study conducted by He and Mukherjee (2008) examined how organizational identification was related to job satisfaction and organizational commitment. The research was conducted with Chinese salespeople and showed that organizational identification represents a link between job satisfaction and job commitment. Job satisfaction was divided by the researchers into intrinsic and extrinsic. Intrinsic job satisfaction referred to how employees viewed their partic ular jobs. Extrinsic job satisfaction included employee’s satisfaction by their working conditions, such as pay, environment, and management. The two different types of job satisfaction related differently to both organizational identification and organizational commitment. In particular, as He and Mukherjee (2008, 2) outline, †extrinsically motivated job satisfaction has a stronger relationship with organisational identification than intrinsically motivated job satisfaction.† The Minnesota Satisfaction Questionnaire was used by the researchers to measure job satisfaction. An Organisational Commitment Questionnaire was used for measuring organizational commitment. Finally, an Organizational identification measure designed by Ashforth and Mael (1992) was used to measure organizational identification of 438 Chinese salespeople representing real estate industry. The results showed that extrinsic job satisfaction had a positive influence on organizational id

English High School Essay Example | Topics and Well Written Essays - 500 words

English High School - Essay Example Blanche is a character possessing relatively low self-esteem. Her driving force - desire - makes her constantly suffer inside. That's why Blanche has the habit of always bathing as if it were a cleansing ritual. But the feeling of refreshment and renewed strength is not long lasting: the past does not wash away so easily and brings her to the terrible climax. Blanche feels desperately lonely and hopes to meet someone to save her from falling into depression. She focuses on this so much that she falls in the end. Art, as a symbolic expression, often reflects intra-physic conflicts within the artist, and many of Tennessee Williams' plays contain themes of desperate loneliness, human disconnectedness, and victimization between the powerful and the weak. Human psychology in A Streetcar Named Desire is not represented as a guiltless thing; on the contrary, it is more so being represented as an instrument that aids people in committing terrifying deeds. The psychology of humans is being described by Blanche's weak psychological state. Blanche has the psychology of a deprived woman; she wants to be loved, but can never reach it. Stanley's active hatred towards Blanche is obvious throughout the play, especially during his birthday gift to her, his damage of her relationship with Mitch, and his raping her.

Asian Commercial Dominance Annotated Bibliography

Asian Commercial Dominance - Annotated Bibliography Example This is politically, socially and economically. Its dominance economically is represented by countries in this continent. Singapore, Indonesia, Japan, China, India and South Korea are some of the countries that contribute to its economic stability. It is the annual GDP from these countries that has enabled the continent to compete actively with Europe. Other countries like Mongolia, Pakistan, Malaysia, Vietnam and Thailand have also grown tremendously in the economic sector. All this coupled with the minerals in some of the Asian countries ensures that it expands economically. Minerals are found in abundance in Bahrain, Qatar, United Arab Emirates and Saudi Arabia amongst others. This has enabled the economic exchange between this continent and many others (Levinson, p 34). The European continent has over the years held the helm in economic stability. It is ranked the highest in relation to current GDP. This position is threatened by the continued dominance of the Asian continent. Th e above mentioned countries have contributed in their own way to overall Asia’s economic dominance. China has grown steadily over the years to ensure that it is the second largest economic powerhouse in the world. It strongly competes with the nation of Japan. This is in relation to many manufacturing plants. Japan is a powerhouse for very many industrial companies all over the world. It is famous for worldwide brands that include Samsung, Toshiba, Sharp, Phillips, and LG amongst many others (Higham, p 45).

SAM 400 UNIT 10 Essay Example | Topics and Well Written Essays - 250 words

SAM 400 UNIT 10 - Essay Example effectiveness, the power of vision, the leadership equation, empowering people, developing others, leadership principles, importance of ethics and finally understanding people (Marry, pp. 1). In my opinion, the areas of leadership that stand out or rather are most important include the leadership equation, the power of vision, leadership principles and performance management. The leadership equation is in line with the leadership style (s) employed by the coach (Manning and Curtis, pp. 16). The effectiveness of a leadership style is evident by the level of a team’s success thus proper styles of leadership ought to be considered. The power of vision is known to predict the future (Manning and Curtis, pp. 56). This area works to outline a general direction towards success. The principles of leadership are important in the sense that they provide a comprehensive framework under which the operations of a particular team are based (Manning and Curtis, pp. 148). Adherence to leadership principles ensures that discipline and order is maintained in a team. Principles ensure that a good ethical environment is maintained. Finally, performance management is very important since the success of a team is based on its performance (Manning and Curtis, pp. 302). It is therefore necessary to evaluate how a team is performing. Good performance should always be upheld. It is the dream of every team to maintain a good record of performance. Poor performance forces the team to reflect on its mistakes with a view to record improved results next time. This reveals how important it is to manage the performance of a