Determination of Ka for a weak Acdi Essay Example for Free

Determination of Ka for a weak Acdi Essay In the experiment preformed the objective is to titrate a weak acid with a strong base. In a titration of a weak acid with a strong base the titrant is the strong base and the analyte is a weak acid. The reaction that will occur is the direct transfer of protons from the weak acid to the hydroxide ion. The data gathered will be represented on the titration curve, a graph of the volume of titrant being the strong base plotted against the pH . The pH is an indicator of an acids strength. The titration curve can be used to determine the pKa. By reading the graph the equivalence point can be found; which is the point where equal parts acid and base have reacted by knowing this the half-equivalence can be found pH=pKa. Procedure In the experiment pH paper will be used instead of a pH meter. The pH will be determined at the beginning and the end of the titration and the data table will be used to calculate the intermediate values. A burette is a more accurate piece of glassware used to deliver the titrate; in the lab being performed disposable pipet will be used making it very important to consistently dispense the same size drops. Before the titration the volume of a drop must be determined. A pipet is completely fill with distilled water. The average number of drops in a mL and the average quantity of a mL represented by on drop is calculated and recorded. Water is added drop by drop to a graduated cylinder from a pipet at the first, second and third mL lines the water drops are recorded. The average number of drops are calculated per mL. The average of the quantity of a mL represented by a drop is also recorded. A data table is set up to represent the trail averages. First 2. 0 mL of unknown acid is measured into graduated cylinder and then poured into a beaker the volume is the recorded. By using a toothpick a drop of acid is placed onto low portion of pH paper, the pH level is recorded. One drop of the phenolphthalein indictor is added to the acid and the color is recorded. The beaker is set on a white sheet of paper before moving on. Next, a well in the 24-well plate is filled with NaOH solution and then sucked up into an empty pipet. The pipet is the held vertically slowly adding drop by drop the NaOH into the beaker of the unknown solution. Drops are added until a color change occurs, changing to a faint pink for at least 30 seconds. A plastic spoon is used to stir after the addition of each drop. The number of drops of NaOH is recorded and the equivalence point is now determined. A drop of the acid is now transferred by toothpick to the high range pH indicator strip. The pH level of the acid is recorded before titration. The contents of the beaker are poured down the drain and all equipment is thoroughly cleaned. The above procedure is repeated twice more, all data is recorded to 4 decimal places for each trail on the data table. The average of the 3 trails is calculated and data is recorded. At the top of the pH column the unknown’s acid’s starting pH level before titration is entered. Next, the pH level of the acid after the titration, at its equivalence point is entered at the bottom of the pH column. The appropriate pH levels for each 2 drop interval is then calculated, by subtracting the initial pH from the final pH and dividing the resulting difference by the number of rows minus 1. This number is then added to the previous pH value. A graph is then made, pH is plotted on the y axis and volume of NaOH added on the x axis. This represents the titration curve. The pH that corresponds with the equivalence point and half equivalence points are located and the pKa is determined for the unknown acid, pH=pKa. The relationship between Ka and pKa is that Ka is the equilibrium constant for the dissociation of a weak acid and pKa is the half-equivalence point where pH=pKa. In addition to the pH, Ka is an indication of an acids strength; pKa = log Ka. B. The potential sources for errors in this experiment are the inconsistent and miscounting of drops of NaOH in the titration. The pipet must be held upright dispensing the exact size drops to have an accurate measurement. C. If your experimental Ka is 5. 3 and the actual Ka of your unknown acid is 4. 7, what is your % error?

Emerson and Thoreau as Prophets of Eco-wisdom :: Biography Biographies Essays

Emerson and Thoreau as Prophets of Eco-wisdom  Ã‚  Ã‚   The major premise of transcendental eco-wisdom is that connection with nature is essential for a person's intellectual, aesthetic, and moral health and growth. One must see and experience nature intimately, whether defined as the "not-me" or as landscape, to participate in the unity of Spirit underlying its visible processes. This connectedness is the basis of the self-reliance which determines how a person lives with integrity in nature and society. Granted, the concept of self-reliance apparently devalues social concerns, including the global commitment and cooperation needed to bring about the kinds of changes that would reverse the climatic greenhouse effect, for example. Indeed, Emerson's ideas have been unfairly appropriated to justify the capitalistic exploitative excesses and insensitivity to social problems and long-term consequences that lie at the root of many of our environmental problems. However, we cannot fault Emerson and Thoreau for not imagining our current dependen ce on technology, the complexity of a largely urban economy or the ties of a global community. Yet even the notion of a self-contained Concord or Walden Pond, which might seem naive and outdated, is reflected in current ideas about eco- regionalism. By accounting for what they could not have known of our present condition, we can still find fruitful ways of understanding where humans, singly and as a species, should fit into nature. Emerson's greatest gift was lessons in seeing in and through nature and extracting symbolic meaning, yet his own intimate encounters with the nature around him were relatively rare and indirect, with few concrete traces in his writings except as occasional metaphors. He wanted his revelations from nature to be abstract and come by surprise, as did the famed mystical encounter at the beginning of his book Nature: "Crossing a bare common, in snow puddles, at twilight, under a clouded sky, without having in my thoughts any occurrence of special good fortune, I have enjoyed a perfect exhilaration. I am glad to the brink of fear." In such an experience, even the self is absorbed by a greater power: "I become a transparent eye-ball; I am nothing; I see all; the currents of the Universal Being circulate through me." The metaphor may be unfortunate, but not his faith that a single person could perceive unspeakable meanings through experiencing nature, even if only indirectly. Such possibilit ies impelled Thoreau and countless others since to mine the details and processes of nature that Emerson had generalized, looking for embedded revelations and sharing in nature's "ecstasy.

The Tragic History of Hamlet, by William Shakespeare

In the Tragic History of Hamlet, by William Shakespeare, , the sane Hamlet occasionally switches between sanity and insanity. When madness orders Hamlet’s purpose, he puts on an â€Å"antic disposition† (I. V. 463). On the other hand, when sanity proves worthy, Hamlet continues back to being logical. Hamlet claims he is â€Å"mad north-north-west (II. ii), meaning he is mad sometimes and sane other times. To achieve his goals, Hamlet continues back and forth between sanity and insanity, which ironically, shows his goal of revenge.To begin, Hamlet starts of insanity to try and achieve his goals. Hamlet uses is insanity as a weapon, changing insanity into the form of words or action. Hamlet is only insane towards his enemies or his enemies allies. For example, Hamlet attacks Ophelia, who has allied herself with Claudius with words â€Å"are you honest† (III. i) â€Å"are you fair† (III. i). Hamlet â€Å"speaks daggers† (III. ii) to Gertrude, because she is an interference to Hamlet. Also, Hamlet destroys Polonius so violently that Hamlet guarantees that Polonius is â€Å"dead, for a ducat, dead† (III. iv).Hamlet deeply harms both Ophelia and Gertrude with his words of insanity, while sending Polonius to the grace with his actions of insanity. All three people, Ophelia, Gertrude and Polonius, are Claudius’ allies, and by hurting Claudius’ allies, Hamlet is indirectly wounding Claudius. This is Hamlet’s short term goal: to get rid Claudius of allies. Besides using insanity to harm Claudius’ allies, the little presence of Hamlet’s insanity troubles Claudius. Gradually, Claudius gets more furious with Hamlet and knows that â€Å"madness in great ones must not unwatch'd go† (III. i.). Hamlet's insanity causes Claudius to send people to uncover the mysteries of his insanity. Hamlet's fake madness causes Claudius to increase anger. Claudius' confusion is Hamlet's other short-term goal. In brief, Hamlet's insanity has helped him achieve his short-term goals of eradicating Claudius' allies and confusing Claudius. On the other hand, Hamlet returns to sanity and uses it as a method of concentration. Whenever Hamlet is sane, he is focused on the current situation. When Hamlet encounters the ghost, he tells it to â€Å"speak†, because he is â€Å"bound to hear† (I.v. ). While speaking with the ghost, Hamlet cries for his â€Å"prophetic soul† (I. v. ). Hamlet is also very focused when speaking and listening to Horatio. When Horatio tells Hamlet about the ghost of Hamlet's father, Hamlet asks Horatio to â€Å"let him hear† (I. ii. ). While sane, Hamlet's thoughts are clear and he is focused on the topic. When meeting his father's ghost, he pays full attention to it. When Hamlet speaks to Horatio about Hamlet's father's ghost, Hamlet listens and speaks with sanity. Hamlet also refers to his â€Å"prophetic soul† (I. v. ).Since Hamlet des cribes himself to have a â€Å"prophetic soul† (I. v. ), it shows that his mind is very clear, unlike the mind of the insane. Hamlet's short-term goal is to concentrate when necessary. When Hamlet is alone, his thoughts are very thorough. For example, Hamlet's â€Å"to be or not to be† (III. i. ) speech is very clearly thought out. Hamlet's thoughts are much more mature than those of the insane. Hamlet's second short-term goal is to philosophize. Through the return into sanity, Hamlet is able to accomplish both his short-term goals of concentration and philosophizing.However, due to the constant reversal between sanity and insanity, Hamlet's revenge is slowed down. Hamlet's mind becomes tangled due to constant changes in personality, between sanity and insanity. Early in the play, Hamlet says that he will put on an â€Å"antic disposition† (I. v. ). However, in the last scene of the play, Hamlet tells Horatio that â€Å"in my heart there was a kind of fightingà ¢â‚¬  (V. ii. ). At one point he says that he will fake insanity, while later, he says that there is fighting in his heart, which hints insanity. Due to this, Hamlet becomes indecisive. Hamlet's inability to act causes his revenge to be slowed.In the end, it is believed that Hamlet is very sane. His act of insanity is to mess with the others heads. He knows that Claudius has sent Rosencrantz and guildenstern to spy on him. He doesn’t want them to know that what he is planning is to unveil the truth, and that Claudius murdered King Hamlet. He does not want Claudius to know that he knows the truth. Hamlet switches between sanity and insanity to achieve his short-term goals. He uses insanity against enemies and sanity as a method of concentration. However, the constant switch of sanity and insanity brings him a slow revenge.

Jazz Music A Progressive Work of Art - 1163 Words

Jazz music can be likened to a progressive work of art. Throughout its history, Jazz music theory and techniques are continuously advancing and reforming as musicians pursue their interests by seeking new methods of expression. Jazz evolution is perpetual, and can take the form of incorporation of new techniques, adoption of more intricate harmonies and rhythms, or establishment of more elaborate melodies (Gioia). The early 1940s saw an increase in the number of Jazz modernists. As swing music declined in popularity due to various effects of the Second World War, Jazz branched into two very contrasting musical styles. The first of these new and unique styles of Jazz, called Bebop emerged in the 1940s, and was the product of numerous jam sessions in back rooms and after-hours clubs. The movement that unfolded in the later 1940’s and 50’s, called Cool (sometimes referred to as West Coast Jazz) came as a response to Bebop’s later demise. Even though Bebop and Cool s temmed from the big band music of the swing era, their differences are apparent. From its conception, to its musicians, to its audiences, Bebop and Cool came into the Jazz timeline for different reasons. Nevertheless the two musical movements ultimately left a long-lasting and distinctive influence on Jazz music, which is still manifested in Jazz music today. Bebop emerged in New York City in the early 1940s and reached its peak at the end of World War II. The post-war period marked a time where racialShow MoreRelatedThe Art Of The Folk1699 Words   |  7 Pages The Art of the Folk: Jazz, Blues, Folktales, Dance: The Harlem Renaissance During the nineteenth- mid-twentieth century, folk became very popular and widely known within the nation. 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