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16 Cards in this Set
- Front
- Back
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Of the 3 oxidation methods for organic samples, which is the least reliable? |
Dry ashing |
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Wavelength range of microwave: |
300-300,000 MHz |
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ACS grade |
Established by the American Chemical Society. Shows max limits of purity on the labels. Commonly used in inorganic analysis |
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Reagent grade |
No specifications for a specific reagent is shown. Manufacturers establish it's own standards and Max limits of allowable impurities |
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CP grade |
Chemically Pure grade. Meets US Pharmacopoeia and National Formulary. Lower grade than ACS or reagent |
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USP or NF |
Meets the US Pharmacopoeia or National Formulary. May not be adequate for use. |
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Purified grade |
Physically clean but not meeting the above grades |
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Technical grade |
Suitable for industrial use, purity not specified |
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Spectra grade |
For organic solvents. Used in UV or IR spectroscopy. Conform to ACS or reagent quality |
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HPLC grade |
For organic solvents, specifically for HPLC use |
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Copper titration method |
React with KI to produce I2, then titrate I2 with thiosulphate (S2O3) with starch indicator. End point reached when solution turns from blue to colorless |
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Determine sulphide sulphur |
Add HCl to the sample and evolve sulphides as hydrogen sulphide gas, and absorb it with flask filled with ammoniacal cadmium chloride solution. Add excess potassium iodate solution, acidify with HCl, and titrate the iodine with sodium thiosulphate and starch as indicator. |
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Sulphate sulphur with gravimetric method |
Boil the solution, then add BaCl2 solution slowly until no more ppt is formed. Weigh a filter paper, filter solution thru it, dry, and weigh paper + ppt. |
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Total sulphur determination |
Burn the sample in a stream of hot air (1460C) in a tubular furnace. Absorb the SO2 in acidified starch iodine solution, and continuously titrating with 0.001M potassium iodate solution |
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Soluble Fe determination |
Titrate with potassium permanganate or potassium dichromate in the presence of barium diphenylamine sulphonate indicator. |
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Determined insoluble Fe |
Add a slight excess of Cu powder, stir, and filter. The filtrate is then titrated again with the same method as soluble Fe |
