List of Common Strong and Weak Acids

Strong and weak acids are important to know, both for chemistry class and for use in the lab. There are very few strong acids, so one of the easiest ways to tell strong and weak acids apart is to memorize the short list of strong ones. Any other acid is considered a weak acid. Key Takeaways Strong acids completely dissociate into their ions in water, while weak acids only partially dissociate.There are only a few (6) strong acids, so many people choose to memorize them. All the other acids are weak.The strong acids are hydrochloric acid, nitric acid, sulfuric acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid.The only weak acid formed by the reaction between hydrogen and a halogen is hydrofluoric acid (HF). While technically a weak acid, hydrofluoric acid is extremely powerful and highly corrosive. Strong Acids Strong acids dissociate completely into their ions in water, yielding one or more protons (hydrogen cations)  per molecule. There are only 7 common strong acids. HCl - hydrochloric acidHNO3  - nitric acidH2SO4  - sulfuric acid (HSO4-  is a weak acid)HBr - hydrobromic acidHI - hydroiodic acidHClO4  - perchloric acidHClO3 - chloric acid Examples of ionization reactions include: HCl → H Cl- HNO3 → H NO3- H2SO4 → 2H SO42- Note the production of positively charged hydrogen ions and also the reaction arrow, which only points to the right. All of the reactant (acid) is ionized into product. Weak Acids Weak acids do not completely dissociate into their ions in water. For example, HF dissociates into the H and F- ions in water, but some HF remains in solution, so it is not a strong acid.  There are many more weak acids than strong acids. Most organic acids are weak acids. Here is a partial list, ordered from strongest to weakest. HO2C2O2H -  oxalic acid  H2SO3  -  sulfurous acidHSO4  -  - hydrogen sulfate ionH3PO4  - phosphoric acidHNO2  - nitrous acidHF - hydrofluoric acidHCO2H -  methanoic acidC6H5COOH -  benzoic acidCH3COOH - acetic acidHCOOH - formic acid Weak acids incompletely ionize. An example reaction is the dissociation of ethanoic acid in water to produce hydroxonium cations and ethanoate anions: CH3COOH H2O ⇆ H3O CH3COO- Note the reaction arrow in the chemical equation points both directions. Only about 1% of ethanoic acid converts to ions, while the remainder is ethanoic acid. The reaction proceeds in both directions. The back reaction is more favorable than the forward reaction, so ions readily change back to weak acid and water. Distinguishing Between Strong and Weak Acids You can use the acid equilibrium constant Ka or else pKa to determine whether an acid is strong or weak. Strong acids have high Ka or small pKa values, while weak acids have very small Ka values or large pKa values. Strong and Weak vs. Concentrated and Dilute Be careful not to confuse the terms strong and weak with concentrated and dilute. A concentrated acid is one which contains a low amount of water. In other words, the acid is concentrated. A dilute acid is an acidic solution that contains a lot of solvent. If you have 12 M acetic acid, its concentrated, yet still a weak acid. No matter how much water you remove, that will be true. On the flip side, a 0.0005 M HCl solution is dilute, yet still strong. Strong vs. Corrosive You can drink diluted acetic acid (the acid found in vinegar), yet drinking the same concentration of sulfuric acid would give you a chemical burn. The reason is that sulfuric acid is highly corrosive, while acetic acid is not as active. While acids tend to be corrosive, the strongest superacids (carboranes) are actually not corrosive and could be held in your hand. Hydrofluoric acid, while a weak acid, would pass through your hand and attack your bones.

The Point Of Theatre And Motion Picture Technology

â€Å"The point of theatre is transformation: to make an extraordinary event out of ordinary material right in front of an audience s eyes. Where the germ of the idea came from is pretty much irrelevant. What matters to every theatre maker, I know, is speaking clearly to the audience right now. † This quote by English playwright and screenwriter, Lee Hall, from an essay he published in the Times of London, is central to the connection between theatre and motion picture technology. Since the rise of film in the early twentieth century, these elements have been influencing each other, and working together, to elevate the storytelling and experience of each medium and, in turn, better connecting them to the modern audience. The collaboration of these two mediums has resulted in a new form of theatre, known as digital theatre, that shows â€Å"theatrical entertainment does not have to be either purist (involving only ‘live’ actors on stage), or be consumed by the do minant televisual mass media, but can gain from the strengths of both types of communication.†(Masura). Throughout this paper, the intersection of theatre and motion picture technology will be explored through their effect on each other, in storytelling and experience, and the product of their collaboration—digital theatre. To begin understanding these medium’s influence on one another, it is important to note that theatre’s effect on motion picture technology, and vice versa, does not alter the core principles of eachShow MoreRelatedThe Era Of The Roaring Twenties1623 Words   |  7 Pagesimpacts that influenced America drastically in the 20s to today, was the boom in feature movies/the movie industry. 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The Yellow-Wallpaper Analysis Free Essays

The Yellow Wall-Paper Literary Analysis Charlotte Perkins Gilman uses her short story â€Å"The Yellow Wall-Paper† to show how women undergo oppression by gender roles. Gilman does so by taking the reader through the terrors of one woman’s changes in mental state. The narrator in this story becomes so oppressed by her husband that she actually goes insane. We will write a custom essay sample on The Yellow-Wallpaper Analysis or any similar topic only for you Order Now The act of oppression is very obvious within the story â€Å"The Yellow Wall-Paper† and shows how it changes one’s life forever. The story begins with the narrator’s use of dramatic irony which already tells the reader that something is suspicious about her. John laughs at me, of course, but one expects that in marriage† (508 Gilman). The narrator, which is unknown, states her husband, John, laughs at her but she expects it. In a good marriage, one does not expect their spouse to laugh at them. Even from the first paragraphs, it is obvious the narrator allows herself to be inferior to men. She minimizes herself several more times throughout the story. â€Å"So I take my phosphates or phosphites – whichever it is – and tonics, and journeys, and air, and exercise, and am absolutely forbidden to ‘work’ until I am well again† (508 Gilman). The narrator’s husband is a high standing physician and gives her drugs that will supposedly help her get well. The section â€Å"phosphates or phosphites† gets my attention. A first read of these lines might cause the reader to think she is just a normal woman being prescribed drugs. However, the narrator does not know exactly what type of drugs she is taking. John sees his wife as another patient and nothing else. You see, she takes them simply because her husband is a physician and says they will help her. John is clearly in control of her. Also, the narrator states she is forbidden to work until she is well. John is making sure she does not try to do any type of work at all. He has strict orders for her, one of them being to stay in bed. There are signs of oppression on the first page and more will come. The next quote explains to the reader what types of items are located in the room John chose for the narrator. â€Å"It was a nursery first and then a playroom and gymnasium, I should judge; for the windows are barred for little children, and there are rings and things in the walls† (509 Gilman). Here, the narrator explains to the reader that there are bars on the windows and chained rings coming from the walls. The narrator’s use of the words â€Å"barred† and â€Å"rings† make it very clear that this room was never made for children; it was made to control and isolate a mentally ill person. Convincingly, John told her the nursery was the most ideal place for her to rest and get well. Being lesser than John, the narrator has no authority over him. She has no choice. He controls what she does no matter how she is feeing. From the first glance, the reader can understand that this room was not designed for children. Furthermore into the story, the narrator states she enjoys writing. She feels better when she writes, as if it is healthy for her. She writes, â€Å"There comes John, and I must put this away – he hates to have me write a word† (509 Gilman). The most important part regarding this statement is John has told her to discontinue her writing all together because it is unhealthy for her. John has shattered her self-confidence by controlling her; therefore she does not say a word regarding the relief writing brings her. The reader must recognize the phrase â€Å"he hates me to write a word† to understand the full emphasis of how John feels about his wife writing. She is becoming awfully depressed because of his oppression. More so, John says everything he is doing is helping her get well. She is his main concern. Again, because of John’s utmost control, the narrator does not tell him she is not feeling any better. She cannot share her feelings with him for he will laugh at her. In this quote, John says, â€Å"and really dear, I don’t care to renovate the house just for three months’ rental† (510 Gilman). Here, John states he is not going to change the wallpaper because they will only be in the house for three months. The key words in this line are â€Å"three months†. These words mean the narrator has to stay in the room with the barred windows and hideous, yellow wallpaper for a total of three months. These keywords might be missed if read over too quickly. The quote needs to be read slowly to realize what is happening. The reason they are only there for three months is because the treatment John has given her is going to take three months. The narrator does not realize this. Under his rule, she cannot stop the treatment. With the ending near, the narrator gradually descends into madness. While examining the wallpaper closely at night she narrates, â€Å"The woman behind it shakes it! she writes, â€Å"and she crawls around fast and her crawling shakes it all over. † â€Å"And in the very shady spots she just takes hold of the bars and shakes them hard† (Gilman 516). The woman that the narrator sees is actually herself. It is a projection of her because she cannot escape John’s control just how the woman cannot escape the wa llpaper. Her illness has become so great she thinks a woman is shaking the wallpaper around the entire room. The problem here is John’s treatment. It has caused her to believe in ghostly objects that do not exist. The phrase, â€Å"her crawling shakes it all over† shows how John’s treatment has affected her. The narrator crawls and creeps around the room. She goes around in circles over and over again with no hesitation. Another phrase, â€Å"she just takes hold of the bars and shakes them hard. † This is the narrator shaking the barred windows trying to escape the room. The narrator knows you cannot escape because â€Å"nobody could climb through that pattern – it strangles so;† (517 Gilman). This compares to John’s control. He â€Å"strangles† her with his treatment. The narrator is trying to express her feelings but she cannot because the wallpaper consumers her every minute. Her feelings cannot escape the room; they are within the yellow wall-paper. Finally, the woman completely loses all sense of stability and becomes mentally deranged. The narrator has had enough. Her feelings are finally able to escape. â€Å"I’ve gotten out at last, in spite of you and Jane! And I’ve pulled off most of the paper, so you can’t put me back† (Gilman 519)! John’s treatment and oppression have made the narrator completely insane. She has finally â€Å"gotten out† from John’s control. A new name emerges, Jane, which is the narrator. The narrator has pulled the wallpaper off and she cannot be put back up. The narrator believes it is a separate person but in fact, it is her. Jane† escaped the wallpaper just like the narrator escaped the control of John. In the final analysis, John comes home to see what has happened to his wife. The narrator writes; â€Å"Now why should that man have fainted? But he did, and right across my path by the wall, so that I had to creep over him every time† (51 9 Gilman)! This is by far the creepiest and most mysterious part of the story. John sees what she is doing and faints right into the path of her â€Å"creeping. † The narrator had to â€Å"creep† around the entire room, crawling against the wall over John’s lifeless body. And now, the narrator was in control. John could do absolutely nothing to stop her. She could do as she pleases. If you look closely, the words â€Å"every time† emphasize that John never awoke. He was dead as the psychotic narrator crept over him. He could no longer control her ever again. As a final point, this text leaves the reader with many predictions and questions that cannot be completely answered. Gilman’s short story proves how a man’s control can affect one’s life forever. The oppression and mental abuse show the narrator’s difficulty living within this unequal climate. This story can put a little â€Å"creep† into anyone as it did with myself. How to cite The Yellow-Wallpaper Analysis, Essay examples