English translation: solución de prueba de almidón / starch test solution
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15:27 Jan 19, 2008
Spanish to English translations [PRO] Science - Chemistry; Chem Sci/Eng
Spanish term or phrase:SP de almidón
Not sure if the acronyms SP and SV in this case are already in English, and what they stand for.
Can't seem to find anything so any help for both would be much appreciated!
Diluir con 40 mL de agua y agregar 2 gotas de SP de almidón.
Explanation: Pienso que SP puede significar Starch Powder o Sweet Potato (una fuente de almidón). En este caso, y teniendo en cuenta la frase, tiene más lógica que sea Starch Powder con lo cual habría una repetición de starch y almidón.
Miguel Cabelo Local time: 14:44 Specializes in field Native speaker of: Portuguese PRO pts in category: 8
The classical method for the determination of dissolved oxygen in aqueous solutions is
known as the Winkler Method. In an alkaline solution, dissolved oxygen will oxidize
manganese(II) to the trivalent state
8 OH-(aq) + 4 Mn2+(aq) + O2(aq) + 2 H2O (l) => 4 Mn(OH)3(s)
Potassium iodide is also added to the solution which is oxidized by the manganic hydroxide when
the solution is acidified.
2 Mn(OH)3(s) + 3 I-(aq) + 6 H+(aq) => I3-(aq) + 3 H2O(l) + 2 Mn2+(aq)
The triiodide produced is then titrated with sodium thiosulfate, S2O32-.
2 S2O32-(aq) + I3-(aq) => S4O62-(aq) + 3 I-(aq)
Therefore, for each mole of dissolved oxygen, four moles of thiosulfate are used in the titration.
The convoluted set of steps is necessary to produce a fast, stoichiometric titration. Success of the
method is critically dependent upon the manner in which the sample is manipulated; at all stages,
every effort must be made to assure that oxygen is neither introduced to nor lost from the sample.
Biological Oxygen Demand (BOD) bottles are designed to minimize the entrapment of air.
The sample should be free of any solutes that will oxidize iodide or reduce iodine.
Numerous modifications have been developed to permit use of the Winkler method in the presence
of such species.
In this experiment the thiosulfate solution will be standardized against triiodide generated
from primary standard potassium iodate.
KlO3(aq) + 8 I-(aq) + 6H+(aq) => 3I3-(aq) + 3H2O(l) + K+(aq)
Zareh Darakjian Ph.D. United States Local time: 05:44 Specializes in field Native speaker of: English, Armenian PRO pts in category: 95
Explanation: SP = Solución patrón/ Solución de referencia
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