Weak base

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    Natural Indicators Lab; a Study in pH Levels Using Green Cabbage Introduction- pH is the concentration of hydrogen in a substance. It is the scale used to tell how acidic or basic a solution is. The normal pH scale goes zero to fourteen. Zero to about six indicates that the solution is an acid. If the solution is closer to zero it makes it a stronger acid, but if the solution is closer to seven than it is a weak acid. If a solution has a pH of seven then it is neutral. A pH of eight to fourteen indicates that the solution is a base. The farther the pH level is from seven the stronger the base. If the solution has a pH close to seven that indicates that it is a weak base. To determine the pH of certain substances one will use an indicator. An indicator is a dye…

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    Titration Lab

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    the unknown, unknown #2, with a burette. The NaOH is dripped until the reaction is complete, while measuring the pH per amount of base added. Using the data collected, the equivalence point can be found and the concentration can be calculated. Then the KA can be found at specific points (20%, 40%, etc). After finding the KA’s at specific points the average can be taken and compared with actual KA to determine the identity. Another method used was qualitative methods. 3 indicators were set up…

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    How can we differentiate acids and bases? How do we know if a substance is an acid or a base? There are different methods to discover whether a substance is an acid or a base. One of the methods is by using an acid-base indicator or by identifying hydrogen or hydroxide ions in a substance’s chemical formula. Certain materials such as a plastic template, red litmus paper, blue litmus paper, phenolphthalein, universal indicator, and a pH chart can be used to help us distinguish acids and bases.…

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    solutions were obtained in addition to a spot plate and pH test paper. An expectation matrix was constructed. The pH of each solution was measured and labeled from a strong base to a very strong acid. Then, react one of the unknown solution with all of the others and note any visible reaction (change in color or formation of precipitate) that occurs. After that, some the solutions might be identified throughout the…

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    Primary Standard

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    1) Primary standard: primary standard is a highly pure compound which is a reference for identifying the concentration of a known compound in titration. Titrant: in titration; titrant is a solution whose concentration is known. When there is an unknown solution (analyte), titrant is used for identifying the concentration of that unknown by adding titrant to analyte. (using burette) Acid –base indicator: acid- base indicator is an indicator that determines the pH of a solution by changing its…

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    Identifying Acid Values

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    Those solutions who possess pH values less than that of 7 is considered as acids, those with pH values greater than 7 are known to be bases, while those having pH equal to 7 is identified as neutral substances (Petrucci, 2011). Identifying its electrolytic property also helps to characterize the given solutions. Strong electrolytes, such as strong acids and bases and salts are known to fully dissociate its ions in the solution, making it a good conductor of electricity. On the other hand, the…

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    Acid Base Balance Study Guide Definition: The body’s ability to regulate and compensate for variances of the acidity or alkalinity of body fluids through mechanisms in the brain, kidneys, lungs, and buffering system. Concept Key Terms: • Acid: any substance that has a pH less than 7.0 • Acidosis: the condition of having too much acid build up in body fluids, below 7.35 • Alkalosis: the condition of having too much alkaline build up in body fluids, above 7.45 • Anion: a negatively charge…

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    Introduction: Acids and bases are often described using the Bronsted-Lowry theory which states that acids are proton donors, while bases are proton acceptors (Thorne, 78). This means that an acid has additional H+ ion(s) that can be given, whereas a base lacks these ions and will accept them. Acids and bases can further classified as strong or weak. A weak acid, such as HF, will not ionize completely, meaning that only some of the H+ ions will be lost. A strong acid will however, will release…

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    Analysis Of Ka And Pkb

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    DETERMINATION OF pKa AND pKb USING ACID-BASE TITRATIONS Introduction Acid-base titrations can be used to determine pKa of a weak acid and pKb of a base. A weak acid and a weak base incompletely dissociate in water. For this reason, the concentration of hydrogen ions (H+) and hydroxide ions (OH-) depend on equilibrium coefficients of acid (Ka) and base (Kb). Equation 1 shows the chemical dissociation equation of a weak acid. Furthermore, Equation 2 describes the equilibrium constant of a weak…

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    The reaction of phenolphthalein reacting with sodium hydroxide consists of C20H14O4+ NaOH → NaKC8H4O4 (aq)+ H2O(l) Phenolphthalein is used as an indicator in this reaction because it changes color when a solution reaches a pH of around eight, or in other words the endpoint of a solution. It also allows us to see a physical change, thus resulting in a more accurate measure of how much was titrated. Citric acid is a weak acid, making it best titrated by using a strong base, such as sodium…

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