• Re: Acid dissolution + Caffeine. Please Help

    Updated: 2010-07-31 19:06:40
    We have a CH3COOH dissolution [0.1M], 10ml of dissolution.CH3COOH + H20 <=> CH3COO-   H3O+   Ka= 1.8x10-5=[H3O+]x[CH3COO-]/[CH3COOH][H3O+]=[CH3COO-]= 0.01254 ph=-log[H30+]= 1.90 poh=14-1.9=12.1 [OH-]= 7.94x10-13Then, we add the caffeine 10mg. [Caffeine]=0.005Caffeine + H20 <=> CaffeineH+    H-    kb= 4.0x10-11=[CaffeineH+]x[OH-]/[Caffeine] Which is the [OH-] to put in the formula? 7.94x10-13?

  • Obstreperous Theocracy

    Updated: 2010-07-31 18:06:50
    So it appears that the US is quietly building up military forces within striking distance of Iran. The island of Diego Garcia (UK) has served as a staging area for standoff weapons. The military-political establishment has been busy with threat analysis and is evidently staging forces to some extent based on their conclusions and evolving policy. [...]

  • Re: Acid dissolution + Caffeine. Please Help

    Updated: 2010-07-31 18:01:37
    ka = conc of product1 x conc of prod 2 x conc of product …. (in moles) divided by the conc of reactant1 x conc of reactant 2 x reactant of product …. (in moles) ,in your case1.8x10-5 = molar conc of CH3COO- x molar conc of H3O+ / molar conc of CH3CO2H x molar conc of waterrearrange it and you have the pH which is the molar con of H3O+

  • Acid dissolution + Caffeine. Please Help

    Updated: 2010-07-31 15:16:04
    We have a CH3COOH dissolution [0.1M], 10ml of dissolution. We add 10mg of caffeine C8H10N4O2.CH3COOH + H20 <=> CH3COO-   H3O+    a= 1.8x10-5Caffeine + H20 <=> CaffeineH+    H-    kb= 4.0x10-11Which is the [CaffeineH+] and the ph?Thank you

  • Re: Brine Electrolysis question

    Updated: 2010-07-31 14:43:43
    UserInfo : July 31, 2010, 10:22:34 AM Welcome , Guest Please login or register Did you miss your activation email 1 Hour 1 Day 1 Week 1 Month Forever Login with username , password and session length Forum Rules Read This Before Posting Home Help Search Calendar Login Register Search Chemical Forums ChemicalForums , Google Chemistry-Blog Art from molecular models Chemistry-Blog.com Google Sponsors Content ChemBuddy ChemFeeds Chemical Forums Chemistry Blog Chem Reddit : Resources General Chem Word Dict . Periodic Table Chemical Forums Chemistry Forums for Students High School Chemistry Forum Moderator : Donaldson Tan Brine Electrolysis question Pages : 1 Go Down previous next Print Author Topic : Brine Electrolysis question Read 146 times 0 Members and 1 Guest are viewing this topic .

  • Trombone Shorty

    Updated: 2010-07-30 01:52:09
    I have a guitar and sometimes I pick at the strings before I retire for the evening. Regrettably, I can’t produce much that is recognizable. It’s just an elementary condition related to a lifelong neglect of this kind of activity. My brain plasticity has produced a tough layer of rythmic dissonance between my grey hair and [...]

  • Dangerous Chemistry Sets

    Updated: 2010-07-26 23:23:02
    From: SMBC – Fear Itself ~Mitch

  • This week on Chemistry World…

    Updated: 2010-07-26 14:02:21
    26 July 2010: Have something to say about an article you’ve read on Chemistry World this week? Leave your comments below… This week’s stories… Catalytic reaction lends a hand with sensing Boronic acid sensing of saccharide is enhanced by coupling it with a catalytic reaction claim Chinese scientists. Methane all lined up The direction methane molecules are vibrating when they [...]

  • Seven Figures

    Updated: 2010-07-23 14:51:13
    We sat in a small conference room across the table from one another and quietly listened to their presentation. The other side presented their wares in the form of a modest brochure and a verbal description of what they produce. The young Chinese-American emigre was VP of Operations and the white haired man next to [...]

  • Sodium – pharaohs, baking and butterflies

    Updated: 2010-07-22 15:03:38
    In this week’s Chemistry in its element podcast, David Read from the University of Southampton tells us about the two faced chemistry of sodium . .

  • Solar-powered process could decrease carbon dioxide to pre-industrial levels in 10 years

    Updated: 2010-07-22 15:00:01
    (PhysOrg.com) -- By using the sun's visible light and heat to power an electrolysis cell that captures and converts carbon dioxide from the air, a new technique could impressively clean the atmosphere and produce fuel feedstock at the same time. The key advantage of the new solar carbon capture process is that it simultaneously uses the solar visible and solar thermal components, whereas the latter is usually regarded as detrimental due to the degradation that heat causes to photovoltaic materials. However, the new method uses the sun`s heat to convert more solar energy into carbon than either photovoltaic or solar thermal processes alone.

  • Andy Grove on Scaleup

    Updated: 2010-07-20 23:21:07
    Andrew Grove is the former CEO of Intel who was responsible for its transition from memory chip producer to microprocessor producer. According to Wikipedia, Grove is responsible for an increase of 4500 % in Intel’s market capitalization. In his youth he and his family escaped from Budapest, Hungary during the Soviet invasion of 1956. Groves holds a PhD in [...]

  • This week on Chemistry World…

    Updated: 2010-07-19 14:51:11
    19 July 2010: Have something to say about an article you’ve read on Chemistry World this week? Leave your comments below… This week’s stories… Buckyballs give clue to space mystery Fullerenes have been identified in space, raising the hopes of discoverer Harry Kroto that they hold the answer to a persistent astronomical problem Microspheres help restore eyesight Polymer microspheres could [...]

  • Russia being Russia

    Updated: 2010-07-16 14:01:26
    It was reported that the Russian Parliament has approved a draft of a law to increase the powers of its FSB, or the remnant of its Soviet era KGB. The final version is somewhat weakened from its earlier form, which prescribed punishment for individuals who ignored such warnings from the F.S.B. In remarks posted on [...]

  • Bastille Day

    Updated: 2010-07-14 20:17:41
    Happy Bastille Day, if that is an actual greeting. A little bit of Edith Piaf is in order. And some wine and cheese.

  • Viewpoints on American Business

    Updated: 2010-07-13 23:03:57
    Over at the Robert Reich blog there is a recent commentary on Chinese currency policy. Reich makes some interesting comments on the Chinese approach to industrialization. But most fundamentally, China is oriented to production, not consumption. It wants to become the world’s preeminent producer nation. While keeping the yuan artificially low is costly to China [...]

  • Common Student Difficulties in Organic Chemistry

    Updated: 2010-07-13 15:51:43
    While cleaning out my newly assigned “war room” (the setting where I’ll strategize on how best to torture students this fall), I came across some fairly interesting documents that were buried in far corners of crowded file cabinets.  They’re nothing personal or discriminating (sorry TMZ), but I saw them as material I could use in [...]

  • NatGeo King Tut Exhibit- Ho Humtep of the Ballyhoo Dynasty

    Updated: 2010-07-08 23:18:34
    Th’ Gaussling went on a minor field trip recently to the local art museum in Denvertown to see the marvels of King Tut. And what a marvel it was … of marketing. It is hard to say that the exhibit met expectations. To be sure, there are some fine artifacts on display.  And it is a splendid example [...]

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