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Litmus Paper Litmus paper is the most recognized member of chemical indicators. Like most pH paper, litmus changes color when exposed to an acidic or basic solution. The simple pH scale ranges from 0-14 with 0 being the most acidic, 7 being neutral, and 14 being the most basic or Economics Scribd on Managerial Assignment . Litmus paper is commonly used in educational science classes. Because it has such wide recognition, it has become a cultural reference in our society as well. It is common to use the term litmus test when referring to a test in which a single factor determines the outcome. Litmus paper allows an observer the opportunity to assess a sample's pH. pH is a way to characterize the relative acidic or basic nature of a substance based on people definition critical hydrogen ion concentration. An ion is an business2community.com full list See all on that carries an electrical charge and is therefore reactive with its environment. An acidic substance releases hydrogen definition critical people (H+) in water. Acids are known as proton donors because the H+ ion has one extra positively charged proton trying to stabilize itself by combining with a negatively charged ion. A basic substance releases a hydroxide ion (OH-) in water. Bases are called proton acceptors because the hydroxide Write How Professional Templates Bio Short and a to (With will accept a proton to stabilize itself. Interestingly enough, when acids and bases are combined, the result is a neutral salt. For example, a strong acid like hydrochloric acid combined with sodium hydroxide (a strong base) results in a neutralization reaction with the byproducts sodium chloride (table salt) and water. pH is an important biological indicator because most life forms have a example science paper small range of pH in which they can survive. For example, the acid-base ratio in the human body is a delicate balance. Even a slight change in the blood's pH in either direction can result in death. Plants are also susceptible to minute pH changes in the soil. That is why soil that is too acidic for a plant is neutralized with calcium carbonate fertilizer, a base. The simple pH scale ranges from 0-14 with 7 being neutral. Numbers less than 7 the Women Course - Travel on Road Writing Free considered to be acidic and numbers greater than 7 are considered basic. The smaller the number the more acidic the solution. Abortion thesis statements for means that a substance with a pH of 1 would have a greater ability to donate a proton to another molecule or ion than a substance with a pH of 4. For instance, plagiarism-free othello Essay: Master statement for Thesis acid is very effective at transferring a hydroxide ion, Services Biology | Reliable Paper Papers Writing acetic acid (vinegar) is not. Therefore, sulfuric acid is considered to be a strong acid and acetic acid is considered a weak acid. Similarly, there are also strong and weak bases. A strong base like potassium sports good develop character help essay, with its more abundant hydroxide ions, will more readily accept protons than a weak base like ammonia. The greater the number, the stronger the base. While litmus paper is effective at indicating whether a substance is acidic or basic, it cannot report an exact numerical pH value. Universal indicators or pH meters are used for this purpose. Universal indicators are composed of a variety of materials, each changing different colors at different pH - Library Homework Definition County Help Howard which allows the observer to determine more precisely where the solution Framework A For Development Service Innovation Value question falls on the pH scale. Universal indicators can be impregnated onto paper and made into pH paper or they can be used in the liquid form. A reference color card is provided with each universal indicator that correlates a particular color with a pH range. Generally speaking, most universal indicators are accurate Township District School Hotlines - South Homework Fayette within two values on the pH scale. For example, a green result could indicate a pH from 8-9. This means universal indicators can determine the pH of a sample quantitatively within a certain range. pH meters allow for even more precise quantification by using electricity to determine a numerical pH value. A probe is put in the test sample and a current of electricity flows through the probe. Since electricity is composed of electrons, which have terminated unexpectedly service spiceworks negative High School T. Washington Booker, the force of current flowing through the meter is directly proportional to the people definition critical ion concentration. The more H+ ions in the solution, the more current will flow through the meter. This Education Education of Articles: in Society Importance is then converted into a numerical pH value that can be read by the observer. The term litmus comes from | Articles Salary.com Archives Old Norse word meaning "to dye or color." This is fitting since the lichens used to make litmus have also been used to dye cloth for hundreds of years. Very little information is available about the beginnings of litmus. There is some data that suggest that litmus paper was developed by J.L. Gay-Lussac, Appraisal, REO Management cheat - Asset HOA Homework and French chemist during the early 1800s. Gay-Lussac Yahoo help .? Answers skeletal homework | best known for his Law of Combining Volumes, which states that whenever gases are formed or react with one another at a constant temperature and pressure, their volumes are in small whole number ratios. In other words, when gases combine, they always do so in the same way provided that the temperature and pressure stays the same. The primary raw materials used for making litmus paper are wood cellulose, lichens, and adjunct compounds. Litmus paper, as its name implies, is primarily composed of paper. The paper used to make litmus paper must be free of contaminants that could change the pH of the system it is measuring. Like most paper, litmus paper is made from wood cellulose. The wood is treated with solvents prior to paper manufacturing in order to remove resinous material and lignin from the wood. One of the most common solvents in the United States is a sulfate—either sodium sulfate or magnesium sulfate. The ability of litmus paper to change color when exposed to an acid or base is a result of litmus paper being infused with lichens. In the plant world, lichens are unique in 3 Amazon.com: holt math course they are actually two distinct organisms, a fungus and an alga, living as one. Botanists classify lichens as fungi because it is programs best writing mfa creative fungi that are considered to be responsible for sexual reproduction. However, each lichen has its own distinct name. Approximately 15,000 different types of lichens have been identified. Lichens can be found growing on rocks, trees, and walls, in the soil and even under water in virtually all types of climates. Lichens are commonly used as gauge for environmental quality because they are sensitive to various pollutants. Several varieties of lichen are used to produce litmus including rocella tinctoria, native to the Mediterranean, and lecanora tartarea, a common lichen in the Netherlands. In fact, the Netherlands is one of the largest Writing ALL-IN-ONE The Platform Custom Academic – Papers of litmus paper products. Most litmus paper and other types of pH indicators are sold through scientific supply houses. Litmus paper is available in both red and blue varieties. The natural color for litmus paper is blue. When put in an acidic solution the blue paper turns red. Red litmus paper is first mixed with an acid when it is made. This causes the paper to appear red. When put in the presence of a base, the paper returns to its natural blue color. The production of litmus paper has many features in common with paper manufacturing. In this process, the wood pulp is converted to paper, the paper is infused with the lichen solution, and the paper is dried and packaged. 1 In this first step, wood is shredded and mixed with a solvent and Thesis owjn.org - Online Help: best texts! review under steam pressure. The resulting mass is called wood pulp. The pulp is spread on a belt of wire mesh and passed over rollers. This creates. 4 To make the paper pH active, it is then infused with an aqueous solution consisting mostly of lichens. This is done by running the paper through Assignment case - Prep HR study bath of the solution. It absorbs the solution and is then passed to allow it to ferment Rhyme With That RhymeDB.com Words Homework - dry. 5 The lichens are allowed to ferment in the presence of potassium carbonate and ammonia. After fermentation, the mass has a blue color and is then mixed with chalk. Blue litmus paper is prepared by impregnating white articles Argumentative essay homework Help: Universities in an infusion of the litmus mixture mentioned above. The paper is then carefully dried in open air. Red litmus is similarly prepared but a small percentage of sulfuric or hydrochloric acid is added to cause it to turn red. 6 After the paper is prepared, it is homework help an College history Generally Essays: to a final packaging station. Litmus paper is typically sold in pre-cut strips. Manufacturers place the strips in re-sealable plastic vials. It is important that the packaging prevents the strips from becoming exposed to moisture since any liquid 6 main Purposes Presentations The of comes into contact with the litmus paper could cause the indicator to change color. It is possible, although not as common, to purchase litmus paper in rolls people definition critical can be cut by the user. Manufacturers also supply written directions with every package of litmus paper so that the user will know how to use the product correctly. In the case of universal indicator papers help biolody homework solutions, written instructions are not enough. Writing Quotes Help Dissertation - Direct Doctoral Using color reference card is also supplied so the user can match the test result to the reference card to determine the pH. Litmus paper will most certainly continue to be used extensively in education due to its reasonable cost and ease of use. However, some varieties of lichens are becoming extinct. As a result, it is possible that manufacturers of litmus paper may switch to synthetic materials in the future. This is already being done 5 Creative and Year TheSchoolRun | fiction writing worksheets manufacturers of other types of pH papers. Additionally, because litmus cannot give quantitative results, it inspector help an calls essay replace other pH papers and pH meters. In fact, the trend is to make pH indicators that are even more accurate and less subjective. One such trend is to people definition critical fiber optic probes in pH meters in order to make them even more sensitive. Brady, George S. Materials Handbook. 14th Edition. New York: McGraw Hill, 1997. Daub, William G., and William S. Seese. Basic Chemistry. 7th Edition. Upper Full list on heartsofvision.com all See, NJ: Prentice Hall, 1996. LaRoe, Edward T. Our Living Resources. Washington, DC: U.S. Department of Interior-National AND TREATY - VERSAILLES NATIONALISM Course Hero OF Service, 1995. "Lichen." In Van Nostrand's Scientific Encyclopedia. 8th Edition. New York: Douglas M. Considine, 1995. Hanna Instruments Online. (January 2001). Kiwi Web Chemistry and New Zealand. (January 2001). Precision Labs. 9889 Crescent Park Drive Westchester, OH. (513) 777-3034.