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ChemGrrl
(Guilty of Contempt)
01-05-02 09:35
No 252949
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pH indicator solutions
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SWIC has been having a difficult time of acid/base purifications. Seems that SWIC's pH paper is insufficiently clear about when the pH is around 7 and thus is of very little use until the solution has been too acidified. I suggested to SWIC that she investigate using some pH indicator solution in her water layer so that she would have a visual cue as to when she reached the right point.<br><br>From my old Analytical text it lloks like Bromthymol blue should work, but I wasn't about to suggest it to SWIC until I knew something about its toxicity or reactivity. Strangely enough, I couldn't find either bit of info in the Merck Index, and the analytical text I have is not geared to clandestine drug chemists (imagine that!)<br><br>Do any bees have any more information on this, or an idea on a better pH indicator for the range 7.0-7.6? Also, if SWIC were to use bromthymol blue in the acid/base claen-up of pseudo would any residual indicator react with the rp?I<sub>2</sub> or otherwise mess up the reaction (aside from the added mass when weighing the reactant.)<br><br>Any help is appreciated by SWIC.<br><hr><font color="purple">ChemGrrl</font color="purple"><br><br>"All I wanted was a Pepsi..."
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<font color="#FF0033">Rhodium</font><br>
<i>(<span title="The user's title at the time of posting">Chief Bee</span>)</i><br>
<span title="Posting date">01-05-02 10:35</span><br>
<span title="Link to this post by using the markup [252954]">No 252954</span><br>
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<title>Re: pH indicator solutions
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BTB (Bromothymol blue) switches from yellow (acid) to blue (basic) in the range you describe, and is greenish in that range, as part of the indicator molecules are blue and the other part yellow at that pH.
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fierceness<br>
<i>(<span title="The user's title at the time of posting">Newbee</span>)</i><br>
<span title="Posting date">01-05-02 16:13</span><br>
<span title="Link to this post by using the markup [253008]">No 253008</span><br>
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<title>Re: pH indicator solutions
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I'm not sure if you are asking this or not, but in case you arent: Can you put some of the indicator solution into the actual solution with your E or honey without it harming your product? And can the stuff be cleansed out later with acetone? I was thinking of using some of the pH indicator that is found in fish/aquarium stores; I am not sure of the actual ingredient though.
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<font color="#ff0000">Osmium</font><br>
<i>(<span title="The user's title at the time of posting">Stoni's sexual toy</span>)</i><br>
<span title="Posting date">01-06-02 17:53</span><br>
<span title="Link to this post by using the markup [253378]">No 253378</span><br>
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<b title="The subject of this post">Re: pH indicator solutions</b>
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It's not the pH paper that isn't working. It's just that pH is -log H<sup>+</sup>, therefore it's nearly impossible to exactly hit 7.0, or anything close when working with small amounts.<br>And what is this fascination for pH 7 people have?<br>Strong acid + weak base will not produce a salt with pH7
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wareami<br>
<i>(<span title="The user's title at the time of posting">Hive Bee</span>)</i><br>
<span title="Posting date">01-07-02 10:15</span><br>
<span title="Link to this post by using the markup [253641]">No 253641</span><br>
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<b title="The subject of this post">Re: pH indicator solutions</b>
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bromthymol blue Organic Chemistry. C<sub>27</sub>H<sub>28</sub>Br<sub>2</sub>O<sub>5</sub>S, white to yellow crystals that are soluble in alcohol and alkaline solutions and slightly soluble in water; used as an acid-base indicator (pH 6.0, yellow; pH 7.6, blue). <br><hr>bromphenol blue Organic Chemistry. C<sub>19</sub>H<sub>10</sub>Br<sub>4</sub>O<sub>5</sub>S, prisms or crystals that are slightly soluble in alcohol and benzene and slightly soluble in water; used as an acid-base indicator (pH 3.0, yellow; pH 4.6, purple<br><hr><br>The WingNutz have always used universal indicator solution....if you can get you hands on it, it works well with one drop added to aqueous solution. The slightest pinkness indicates good to go. Since runningout of that they went to the market and picked up 4-way dip sticks that only read in the 6.8-8.0 ph range. <br>As for toxicity of the bromthymol solution....from the fish store.....you asked for it!<img src="../forum/images/icons_lightgrey/tongue.gif" alt="tongue" title="Tongue" heigth="15" width="15"><br><hr>****** ANAYLTICAL SYSTEMS -- BROMTHYMOL BLUE INDICATOR SOLN, 170-S <br>MATERIAL SAFETY DATA SHEET<br>NSN: 650500N036198<br>Manufacturer's CAGE: 90767 <br>Part No. Indicator: A <br>Part Number/Trade Name: BROMTHYMOL BLUE INDICATOR SOLN, 170-S <br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> General Information<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>MSDS Serial Number: BQMQL <br>Hazard Characteristic Code: F5 <br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Ingredients/Identity Information<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Proprietary: NO <br>Ingredient: 4,4'-(3H-2,1-BENZOXATHIOL-3-YLIDENE) BIS(2-BROMO-3-METHYL-6-<br>(1-METHYLETHYL)-, S,S-DIOXIDE; (BROMTHYMOL BLUE)<br>Ingredient Sequence Number: 01 <br>Percent: 0.1 <br>NIOSH (RTECS) Number: SJ7450000 <br>CAS Number: 76-59-5 <br>OSHA PEL: NOT APPLICABLE <br>ACGIH TLV: NOT APPLICABLE <br>-------------------------------------<br>Proprietary: NO <br>Ingredient: METHANOL<br>Ingredient Sequence Number: 02 <br>Percent: 20 <br>NIOSH (RTECS) Number: PC1400000 <br>CAS Number: 67-56-1 <br>OSHA PEL: S,200PPM/250STEL <br>ACGIH TLV: S,200PPM/250STEL; 93 <br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Physical/Chemical Characteristics<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Appearance And Odor: DARK GREEN<br>Boiling Point: 141F,61C <br>Vapor Pressure (MM Hg/70 F): 97 <br>Solubility In Water: VERY SOLUBLE <br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Fire and Explosion Hazard Data<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Extinguishing Media: CARBON DIOXIDE OR DRY CHEMICAL FOR SMALL FIRES.<br>ALCOHOL OR POLYMER FOAM FOR LARGE FIRES.<br>Special Fire Fighting Proc: WEAR NIOSH/MSHA APPROVED SCBA AND FULL<br>PROTECTIVE EQUIPMENT (FP N). ADDITION OF WATER REDUCES INTENSITY OF FLAME.<br>Unusual Fire And Expl Hazrds: NONE SPECIFIED BY MANUFACTURER.<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Reactivity Data<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Stability: YES <br>Cond To Avoid (Stability): HEAT, SPARKS, FIRES.<br>Materials To Avoid: NONE SPECIFIED BY MANUFACTURER.<br>Hazardous Decomp Products: NONE SPECIFIED BY MANUFACTURER.<br>Hazardous Poly Occur: NO <br>Conditions To Avoid (Poly): NOT RELEVANT<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Health Hazard Data<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>LD50-LC50 Mixture: NONE SPECIFIED BY MANUFACTURER. <br>Route Of Entry - Inhalation: YES <br>Route Of Entry - Skin: YES <br>Route Of Entry - Ingestion: YES <br>Health Haz Acute And Chronic: SWALLOWING THE LIQUID CAUSES INEBRIATION,<br>HEADACHE, NAUSEA AND VOMITING LEADING TO SEVERE ILLNESS, BLINDNESS AND<br>PERHAPS DEATH. LIQUID CAUSES EYE IRRITATION. MAY BE FATAL OR CAUSE<br>BLINDNESS IF SWALLOWED.<br>Carcinogenicity - NTP: NO <br>Carcinogenicity - IARC: NO <br>Carcinogenicity - OSHA: NO <br>Explanation Carcinogenicity: NOT RELEVANT<br>Signs/Symptoms Of Overexp: SEE HEALTH HAZARDS.<br>Med Cond Aggravated By Exp: NONE SPECIFIED BY MANUFACTURER.<br>Emergency/First Aid Proc: SKIN: FLUSH WITH PLENTY OF WATER. EYES: FLUSH<br>WITH PLENTY OF WATER FOR AT LEAST 15 MINUTES. GET MEDICAL CARE FOR EYES.<br>INGEST: INDUCE VOMITING @ ONCE. THEN GIVE 2 TABLESPOONS OF BAKING SODA & A<br>GLASS OF WATER. CALL A PHYSICIAN @ ONCE. INHAL: REMOVE TO FRESH AIR.<br>SUPPORT BRTHG (GIVE O*2/ARTF RESP) (FP N).<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Precautions for Safe Handling and Use<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Steps If Matl Released/Spill: FLUSH SPILLED MATERIAL WITH LARGE VOLUME OF<br>WATER.<br>Neutralizing Agent: NONE SPECIFIED BY MANUFACTURER.<br>Waste Disposal Method: WASH WITH WATER DOWN THE DRAIN. DISPOSE OF I/A/W<br>FEDERAL, STATE & LOCAL REGULATIONS (FP N).<br>Precautions-Handling/Storing: DO NOT LEAVE CONTAINER OPEN. AVOID PROLONGED<br>OR REPEATED CONTACT WITH SKIN.<br>Other Precautions: NONE SPECIFIED BY MANUFACTURER.<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Control Measures<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Respiratory Protection: USE NIOSH/MSHA APPROVED RESPIRATOR APPROPRIATE FOR<br>EXPOSURE OF CONCERN (FP N).<br>Ventilation: GEN(MECH): ACCEPTABLE. LOCAL EXHAUST: PREFERABLE.<br>Protective Gloves: PLASTIC GLOVES. <br>Eye Protection: CHEMICAL WORKERS GOGGLES (FP N). <br>Other Protective Equipment: IMPERVIOUS APRON & BOOTS, EYE BATH, SHOWER.<br>Work Hygienic Practices: NONE SPECIFIED BY MANUFACTURER.<br>Suppl. Safety & Health Data: NONE SPECIFIED BY MANUFACTURER.<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Transportation Data<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Trans Data Review Date: 93125 <br>DOT PSN Code: JEZ <br>DOT Proper Shipping Name: METHANOL, OR METHYL ALCOHOL<br>DOT Class: 3 <br>DOT ID Number: UN1230 <br>DOT Pack Group: II <br>DOT Label: FLAMMABLE LIQUID, POISON <br>IMO PSN Code: JPB <br>IMO Proper Shipping Name: METHANOL<br>IMO Regulations Page Number: 3251 <br>IMO UN Number: 1230 <br>IMO UN Class: 3.2 <br>IMO Subsidiary Risk Label: TOXIC <br>IATA PSN Code: QHQ <br>IATA UN ID Number: 1230 <br>IATA Proper Shipping Name: METHANOL<br>IATA UN Class: 3 <br>IATA Subsidiary Risk Class: 6.1 <br>IATA Label: FLAMMABLE LIQUID <br>AFI PSN Code: QHQ <br>AFI Prop. Shipping Name: METHANOL OR METHYL ALCOHOL<br>AFI Class: 3 <br>AFI ID Number: UN1230 <br>AFI Pack Group: II <br>AFI Label: 6.1 <br>AFI Basic Pac Ref: 7-7 <br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Disposal Data<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br> Label Data<br>========================================<wbr>========<wbr>========<wbr>========<wbr>========<wbr>===<br>Label Required: YES <br>Technical Review Date: 05NOV92 <br>Label Date: 05NOV92 <br>Label Status: G <br>Common Name: BROMTHYMOL BLUE INDICATOR SOLN, 170-S <br>Chronic Hazard: NO <br>Signal Word: DANGER! <br>Acute Health Hazard-Severe: X <br>Contact Hazard-Slight: X <br>Fire Hazard-Severe: X <br>Reactivity Hazard-None: X <br>Special Hazard Precautions: FLAMMABLE! KEEP AWAY FROM HEAT, SPARKS, OPEN<br>FLAME. ACUTE: LIQUID CAUSES EYE IRRITATION. <b><font color="red">INGESTION CAUSES INEBRIATION,</font color="red"></b><br>HEADACHE, NAUSEA, & VOMITING LEADING TO SEVERE ILLNESS, BLINDNESS, AND<br>DEATH. CHRONIC: NONE SPECIFIED BY MANUFACTURER.<br>Protect Eye: Y <br>Protect Skin: Y <br>Protect Respiratory: Y <br><br><hr><font color="red"><b><i><center>~ß~Just Wing It!~ß~</i></font color="red"></b></center><br>ô¿ôWareami or «¤¿¤»Wireami
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SnoHoe<br>
<i>(<span title="The user's title at the time of posting">Hive Bee</span>)</i><br>
<span title="Posting date">01-09-02 10:19</span><br>
<span title="Link to this post by using the markup [254437]">No 254437</span><br>
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<b title="The subject of this post">Re: pH indicator solutions</b>
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FYI, don't dwell too much on PH (I don't measure, just throw acid in, so what if it drops super low) then recrystalize using only hot IPO and stick in freezer. It will come out like mine!!<br>
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