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Sodium NaHSO

For years chemists have been using sodium bisulfite (that is BISULFITE not BISULFATE) to actually crystallize a ketone out of solution in order to separate it. As it so happens, our happy little MD-P2P is a ketone. And when an oil mixture containing it is mixed with a saturated solution of sodium bisulfite (NaHSOs) the MD-P2P crystallizes out as a bisulfite addition product . It can then be easily separated by filtration. Here s how it goes... [Pg.57]

Sulfomethylation. The reaction of formaldehyde and sodium bisulfite [7631-90-5] with polyacrylamide under alkaline conditions to produce sulfomethylated polyacrylamides has been known for many years (44—46). A more recent pubHcation (47) suggests, however, that the expected sulfomethyl substitution is not obtained under the previously described strongly alkaline conditions of pH 10—12. This C-nmr study indicates that hydrolysis of polyacrylamide occurs and the resulting ammonia reacts with the NaHSO and formaldehyde. A recent patent claims a new high pressure, high temperature process at slightly acid pH for preparation of sulfomethylated polyacrylamide (48). [Pg.141]

Sulfur Dioxide and Sulfites. Sulfur dioxide [7446-09-5], SO2, sodium bisulfite [15181-46-1], NaHSO, and sodium metabisulfite [23134-05-6] ate effective against molds, bacteria, and certain strains of yeast. The wine industry represents the largest user of sulfites, because the compounds do not affect the yeast needed for fermentation. Other appHcations include dehydrated fmits and vegetables, fmit juices, symps and concentrates, and fresh shrimp (79). Sulfites ate destmctive to thiamin, and cannot be used in foods, such as certain baked goods, that ate important sources of this vitamin. [Pg.443]

Sodium Bisulfite. Sodium bisulfite [7631-90-5] NaHSO, is occasionally used to perform simultaneous reduction of a nitro group to an amine and the addition of a sulfonic acid group. For example, 4-amino-3-hydroxyl-l-naphthalenesulfonic acid [116-63-2] C qH NO S, is manufactured from 2-naphthol in a process which uses sodium bisulfite (59). The process involves nitrosation of 2-naphthol in aqueous medium, followed by addition of sodium bisulfite and acidification with sulfuric acid. [Pg.263]

Sodium bisulfate, NaHSO, is mildly acidic. Appropriate precautions should be taken when using it. [Pg.207]

Sodium bisulfate, NaHSO, is a convenient mild acid and is safe for uses as a household toilet-bowl cleaner, automobile-radiator cleaner, and for swimming pool pH adjustment. It is used for metal pickling, as a dye-reducing agent, for soil disinfecting, and as a promoter in hardening certain types of cement. [Pg.207]

Sodium Bisulfite. Sodium bisulfite, NaHSO, exists in solution but is not a stable compound in the soHd state. The anhydrous sodium bisulfite of commerce consists of sodium metabisulfite, Na2S20. Aqueous sodium bisulfite solution, having specific gravity 1.36 and containing the equivalent of 26—27 wt % SO2, is a commercial product. [Pg.149]

Sodium bicarbonate is generally added to increase alkalinity and muriatic acid (HCl) or sodium bisulfate (NaHSO ) to reduce it. In general, with acidic sanitizers such as chlorine gas or trichloroisocyanuric acid, ideal total alkalinity should be in the 100—120 ppm range, whereas, with alkaline products such as calcium, lithium, or sodium hypochlorite, a lower ideal total alkalinity of 80—100 ppm is recommended (14). Alkalinity is deterrnined by titration with standard sulfuric acid using a mixed bromcresol green—methyl red indicator after dechlorination of the sample with thiosulfate. Dechlorination with thiosulfate causes higher readings due to formation of hydroxyl ion (32) ... [Pg.300]

Besides Fe-, other reducing agents that may be used in conjunction with H2O2 are aliphatic amines, Na2S203 thiourea, ascorbic acid, glyoxal, sulfuric acid, NaHSOs, sodium nitrite, ferric nitrate, peroxidase, AgNOs, tartaric acid, hydroxylamine, ethylene sulfate, sodium phosphite, formic acid, ferrous ammonium sulphate, acetic acid, ferrous sulphate, and HNO2, etc,... [Pg.489]

Sodium hydrogen sulfite, NaHS03, is a preservative that is used to prevent the discolouration of dried fruit. In aqueous solution, the hydrogen sulfite ion can act as either an acid or a base. Predict whether NaHSOs dissolves to form an acidic solution or a basic solution. (Refer to Appendix E for ionization data.)... [Pg.424]

IN A TEST TUBE, HEAT A MIXTURE OF 2 g SODIUM ACID SULFATE (SODIUM BISULFATE] WITH 1 g TABLE SALT (NaCl). HYDROGEN CHLORIDE IS SET FREE AND SODIUM SULFATE IS FORMED NaHSO + NaCl - HCI + No,SO,... [Pg.58]

Sodium Hyposulphite ( Hydrosulphite, Na2S204).—S02 is passed into a strong solution of NaHSOs until saturated, and the mixture reduced with zinc dust. [Pg.512]

The structure of NaHSOs, sodium bisulfite, is rather curious. It is an oxyanion of a sulfur(IV) compound with a lone pair of electrons—the HOMO—on the sulfur atom, but the charge is formally on the more electronegative oxygen As a third row element (third row of the periodic table, that is) sulfur can have more that )ust eight electrons—it s all right to have four or six bonds to S or P, unlike, say, B OrN. [Pg.148]

J, negative impact of chlorine containing effluents on receiving water ecosystems thus, effective dechlorination using sodium bisulfite (NaHSOs) solutions is increasing the salinity of effluents ... [Pg.281]

To trimethyl(vinyl)silane (26.0 g, 259 mmol) and tert-butyl peroxybenzoate (1.02 g, 5 mmol) in MeOH (100 mL) was slowly added NaHSOs (52.6 g, 505 mmol) in HjO (100mL) at rt. The mixture was refluxed for 48 h, carefully concentrated (CAUTION peroxides ) and H2O was removed by azeotropic distillation with MeOH (3 x) by rotary evaporation. The residue was extracted with MeOH (3 x with a total of 250 mL), and the resulting soln was taken to dryness and dried at 150 °C under reduced pressure giving sodium 2-(trimethylsilyl)ethanesulfonate yield 37.0 g (70%). [Pg.124]

Addition reactions with sodium hydrogensulfite, NaHSOs... [Pg.353]

Sodium carbonate 20% solution w as added to neutral (on litmus) reaction find care was taken to avoid an excess of alkali harmful to TNT. A solution of rl6-17% NOjSOj and 0.l-0.3% NaHSOs was added. The sodium-hydrogen Iphite was used to avoid alkaline reaction and also served as a buffer. Cold [water was added to thicken the charge, the whole operation lasted 45 min. The >duct was screened through a 10 mesh sieve, centrifuged and washed with Her. Larger particles were returned for reworking. [Pg.105]


See other pages where Sodium NaHSO is mentioned: [Pg.351]    [Pg.131]    [Pg.332]    [Pg.203]    [Pg.207]    [Pg.76]    [Pg.76]    [Pg.150]    [Pg.235]    [Pg.1044]    [Pg.367]    [Pg.343]    [Pg.335]    [Pg.680]    [Pg.111]    [Pg.31]    [Pg.321]    [Pg.171]    [Pg.248]    [Pg.297]    [Pg.203]    [Pg.207]    [Pg.288]    [Pg.658]    [Pg.682]    [Pg.685]    [Pg.121]    [Pg.235]   
See also in sourсe #XX -- [ Pg.3 , Pg.68 ]




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