Kimia analisis kelompok 4 kelas 11.5
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Iodimetry is a titration technique used to determine the amount of a reductant (substance being titrated) using a standardized iodine solution as the oxidizing titrant. The reductant is oxidized by iodine in a redox reaction. Iodimetry is performed under neutral or weak acid conditions to avoid the disproportionation or oxidation of iodine. Common indicators used include starch solution or carbon tetrachloride.
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This document provides information on iodine titrations, including how they are used for both direct (iodimetry) and indirect (iodometry) titrations. It discusses the solubility of iodine, conditions and precautions for iodine titrations, various methods for determining the endpoint, and applications like assaying ascorbic acid, potassium permanganate, and other compounds. The document also describes how iodine solutions are standardized, often using sodium thiosulfate, as well as how sodium thiosulfate itself must be standardized due to its instability.Iodimetry & iodometry
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This document discusses iodine titrations, including iodimetric and iodometric titrations. Iodimetric titrations use iodine as the oxidizing agent, which reacts with strong reductants. Iodometric titrations involve liberating iodine from potassium iodide using an acid, then titrating the free iodine with sodium thiosulfate. Starch is commonly used as an indicator, turning blue when iodine is present. The document also provides procedures for preparing standard iodine and sodium thiosulfate solutions and describes how to standardize them using arsenic trioxide or potassium iodate, respectively.Iodimetry & iodometry
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Iodometry and iodimetry are titration methods that involve the reaction of iodine with an analyte. In iodometry, the analyte is an oxidizing agent that liberates iodine, which is then titrated with a standard thiosulfate solution. In iodimetry, the analyte is a reducing agent that is directly titrated with a standard iodine solution. Starch is commonly used as an indicator for the titrations. Iodometric and iodimetric titrations cannot be performed in strong acidic or basic conditions due to side reactions involving iodine and interference with the indicators. The methods are useful for determining concentrations of substances like vitamin C,Iodometry & Iodimetry
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Iodometry and iodimetry are indirect titration methods that use iodine. In iodometry, an oxidizing agent reacts with excess potassium iodide to liberate iodine, which is then titrated against a standard reducing agent like thiosulphate. Iodimetry directly titrates a reducing analyte against a standard iodine solution. Starch indicator turns blue or violet in the presence of iodine but is colorless when all iodine reacts at the endpoint of the titration. These methods are used to determine the concentration of various chemicals like vitamin C and thiosulphate.Chemical Properties of Nitric Acid
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This document discusses hydrides of nitrogen, including ammonia and hydrazine. It provides details on their structures, properties, preparation methods, and uses. Ammonia is a colorless gas that is lighter than air. It is prepared through reactions involving ammonium chloride or metal nitrides. Ammonia is used as a fertilizer and cleaning product. Hydrazine is a reducing agent that exists as a colorless liquid. It is prepared through reactions of sodium hypochlorite with ammonia or urea. Both compounds are discussed in terms of their molecular structures and chemical properties.Hydrogen
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This document discusses isotopes of hydrogen, including their properties and natural occurrences. It specifically covers the three main isotopes:
1) Protium (1H1) is the most common isotope of hydrogen, making up 99.98% of naturally occurring hydrogen. It has one proton and no neutrons.
2) Deuterium (1H2) is a stable, non-radioactive isotope that has one proton and one neutron. It occurs naturally at 0.0156%.
3) Tritium (1H3) is a radioactive isotope that has one proton and two neutrons. It occurs naturally at only 4.0 x 10-15%.
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Kimia analisis kelompok 4 kelas 11.5
- 3. Iodimetry is...... Determination of a substance that is a reductant (ex: Na2S203 and Vit C) with a standard solution that is an oxidant (ex: iodine
- 4. reaction, because in this titration we used I2 for titrat who has character oxidator. Iodimetry can produce (terbatas) some substance. Indicator can be used: 1. Amylum 1% 2. CCl4 Iodimetri Titration performed in netral condition or weak acid in the range up to a weak base
- 5. Iodometri consist of 2 is : A. Iodimetri direct method Bahan pereduksi langsung dioksidasi dengan larutan baku Iodium. Contohnya pada penetapan kadar Asam Askorbat. B. Iodimetri metode residual ( titrasi balik) Bahan pereduksi dioksidasi dengan larutan baku iodium dalam jumlah berlebih, dan kelebihan iod akan dititrasi dengan larutan baku natrium tiosulfat. Contohnya pada penetapan kadar Natrium Bisulfit.
- 6. The Different with Yodometri Yodometri Yodimetri Methode Indirect titration Direct titration Titrant Na2S2O3 I2 Sample Oksidator Reduktor Added Indicator Near end point Before titration Titration environment Acid Netral
- 7. The advantages : Faster Processing TA is easily to observation Disadvantages : Easly evaporate I2 is volatile
- 8. pH of Reaction Titrasi iodimetri dilakukan dalam keadaan netral atau dalam kisaran asam lemah sampai basa lemah. Pada pH tinggi (basa kuat) maka iodine dapat mengalami reaksi disproporsionasi menjadi hipoiodat. I2 + 2OH- IO3- + I- + H2O Sedangkan pada keadaan asam kuat maka amilum yang dipakai sebagai indicator akan terhidrolisis, selain itu pada keadaan ini iodide (I-) yang dihasilkan dapat diubah menjadi I2 dengan adanya O2 dari udara bebas, reaksi ini melibatkan H+ dari asam. 4I- + O2 + 4H+ 2I2 + 2H2O
- 9. Oxidation level -1,+1,+3,+5, dan +7 Weak oxidator Can be reacted with all of metal element and non metal element Can be reacted with Hidrogen fomed Halide acid Can formed an Oxy acid with formula HIO,HIO2,HIO3,HIO4.
- 10. The solid, black sparkle bluish Volatile gas at room temperature into a blue violet with a pungent odor Easly soluble chloroform, carbon tetrachloride, or carbon disulfide Slightly soluble in water properties of metal resembling May cause mumps
- 12. A ( Reduktor ) + I2 A ( Teroksidasi ) + 2 I -
- 13. Add 18 grams of KI Dissolve in water Weight 12.90 g I2 Dissolve in water Pour KI solution into I2 solution Dilute to 1 L
- 14. Weighed 1.0000 grams As2O3 + Introduced into 100 ml measuring flask Added + 10 ml 4N NaOH Added 2-3 drops of PP Neutralized with 4N H2SO4, until the pink color of the solution becomes a hint Added 3 grams of crystal NaHCO3 Pipette 10 ml, inserted into erlenmeyer teaser, then diluted to 100ml + Added indicator Kanji 2 -3 drops Dititar with I2 solution until it reaches TA Blue light hint