Inorganic Chemistry

Hi, my laboratory specifies particularly that we use 38% HF as a standard to carry out QC checks on our titration equipment. Anyone knows what is the significance of HF at 38% concentration? It is because i have tons of stock HF at 50% and 49% and thus i would rather use 50% to directly carry out the check than preparing 38% HF from 50% HF then carrying out the QC check. So i want to know what is so special about HF at 38%?

What is an equilibrium equation for H2SO4 and how can i maximise the production rate of H2SO4 by changes in temperature, pressure, concentration and catalysts Also are there any references (preferably websites) where i can reveiw this information to cross check its acuraccy

I have been trying to make Sodium metal by electrolysis of sodium chloride but I just can’t seem to get the salt to melt. I have been using a metal container over a Bunsen burner which should be hot enough to melt it. The melting point of NaCl is 800C. The underside of the container even turns red. Would this work better with a class beaker to keep the heat from sinking away? What temperature can the borosilicate beakers withstand? I used "sea salt" because that’s all I had. Could this contribute to the problem? I figured impurities would just make the crystal structure weaker lowering the melting point. Also As its heating the salt grains seem to explode as if th…

Lemon juice has a pH of about 2.5. Assuming that the acidity of lemon juice is due solely to citric acid, that citric acid is a monoprotic acid, and that the density of lemon juice is 1.0 g/mL, then the citric acid concentration calculates to 0.5% by mass. Estimate the volume of 0.0100 M NaOH required to neutralize a 3.71-g sample of lemon juice. The molar mass of citric acid is 190.12 g/mol. ANSWER IN ml of 0.0100 M NaOH. i did: 3.71g X 0.005 = 0.0186 g citric acid 0.0186g / (190.12g/mole) = 0.0000977 mole 0.0000977 mole X 39.997 g/mole NaOH = 0.00391g NaOH V = 0.00391 / 0.0100 M = .39008 L NaOH = 390.08 mL NaOH says it's wrong..

Hello, I'll make this story short, I'm successfully bottling hydrogen at home using a bucket of water, an upside down gatorade bottle and a car battery charger, I'm sure you know how the setup looks. Anyways, all of that aside I'm using salt to boost the conductivity of the water. Only thing is my water is turning green/orange and it is building up orange substance everywhere, does anyone have a guess to what this is?

iron(III)chloride in distilled water and added HCl and warmed than added ammonia solution; at bench i added 2M HCl than 4.5g sodium acetate till all the solid dissolved. After letting solution cool i added 3cm3 of pentan-2,4-dione then filtered to get product. the product was then 1. Heated 2. Added with 5cm3 conc. HCl 3.5cm3 of sodium hydroxide 4. dissolved the complex in 5cm3 of 50:50 IMS and distilled water, filter and if any solid remained i added 5cm dilute sodium hydroxide 5.dissolve complex as in test 4. add 2cm3 of HCl followed by 2cm3 of potassium hexacyanoferrate (II) solution 6. dissolve complex as in test 4. add small quantity of zinc amalgam with 1c…

Hey ppl (attached diagram) OK so I took some distilled water and saturated it completely with NaCl. I used rods of graphite as my anode and cathode. I am capturing bubbles forming at each pole in some containers. I see bubbles very slowly forming (im using 4 9v batteries) and also the water around the cathode is turning dark yellow and the water around the anode is a foggy white. I'm pretty sure the yellow water is chlorine, but..... What I really want to know is how I get this apparently highly chlorinated water (correct me if i'm wrong) into pure (or as pure as it can be) chlorine gas. I am aware of the health risks, I have this outside. I am not tou…

After storing Car Battery Sulfuric acid in a glass for about a day, I decided to open the jar. When I opened it, I smelled a very powerful chlorine like smell and is wondering what had happened. Is this a normal smell acompanied by this acid after storage in a glass container? Is there a risk of dangerous fumes? There seems to be a black pricipitate on the bottom. I think its lead dioxide.

I heard somewhere what you can make aluminum powder easily by arching two pieces of aluminum under oil (like diesel). Will this work or will it only make aluminum oxide?

Is there any methods in calculating the concentration of an acid?

During a chemistry class, I believe the teacher said that exposing Magnesium to water will cause an explosion (or in his words, a large "pop"). Can anyone verify whether it is Magnesium, or am I thinking of Potassium?

Does anyone know of a way to find out if an unidentifiable liquid is sulfuric acid? pH tester won't be much help in this situation.

I recently made what I believe to be aluminium hydroxide by neutralizing polyaluminium chloride AlnCl(3n-m)(OH)m with sodium hydroxide. I got a white gel that precipitated in water and eventually dried to a hard white solid. With time (a few days) fine rod-like structures with white balls on them began to form on top of the aluminium hydroxide. I've attached some pictures to help show what I mean. I was wondering if these rod-like structures are carcinogenic (like fiberglass) or harmful in anyway or if it isn't even Al(OH)3 like I thought. Any help will be appreciated. It seems pictures can't be attached right now.

inspired by Lances work here: http://www.scienceforums.net/forums/showpost.php?p=211502&postcount=364 I came up with an idea I`ll call electro-painting. in the case of the copper tube in the link above, I recon it would be possible to make the banded areas a little more defined, basicly you`de attatch a wire to the tube making it the cathode (-). then either a paint brush (the sort with the metal colar that holds the bristles in place) with a wite attatched to the colar making it the Anode (+) OR a piece of cotton wool, dipped in a weak soln of the metal salt you wish to plate with, if the voltage is kept low (no more than 2 volts) really accurate plate painti…

Stupid question but when we are heating up CaCO3, we get CaO and CO2 right? But what happens when it doesn't fully decomp completely? I'm figuring the ratio of CaO and CO2 is 1:1, but how would the mole ratio change if it doesn't fully decomp? Also.. if the CaCO3 was contaminated by a thermally stable compound, how would this affect the decomp and ratio? Thanks for the help!

i need a book called Inorganic Chemistry Shriver and Atkins the first edition not the 2nd, 3rd or 4th edition thx......

is it possible to obtain any fairly significant amount of iodine from "iodine tincture"? a bottle is roughly 40ml and cost just above 1$. bit about idone tincture: http://www.jtbaker.com/msds/englishhtml/i2682.htm

i got some realy cheap fertilizer today and i want to extract the potassium nitrate from it. the numbers are 15-15-30. 15% nitrogen, 15%Phosphoric Acid, 30%Soluable Potash and a little others. It is a soluable fertilizer. I herd that there are a few different ways to extract it, i was wondering how i could do it without spending a week of time for 500g of potassium nitrate. Does freezing it in water work? (a rumour) thanks.

Hello every one ! i want to make ferric chloride in solid from Fe2O3 or from Fe what is used for industrials. so could you please teach me how to make it or any advice? and the other hand, could you please kindly guide me how to change FeCl3 liquid to FeCl3 solid? Thanks you very much !

Hi all ! I want to make Ferric Chloride from Fe2O3 for industrial use ( industrial class), could you please kindly advise me some processes? chemical process ? equipments ? Thanks you in advance !

I sit here, trying to do a dry lab, never took chem before, and now I'm premed in College... awesome.. so as the other students seem to have a nice grasp b/c this took this course in HS already (or failed once before), I'm stuck with the assumption that I should "know" this already, and I'm far from understanding it.. My lab has questions such as this: "indicate the oxidation number of carbon and sulfur following the compounds" a) Na2C2O4 b) SO2 ...etc.. is this right?.. Na has +1 oxid#, and there's 2, so it's 2+; O4 is 2-, there's 4 of them so.. 8-.. 8- + 2+ = 6-... there's 2 Carbon.. so each carbon must = 3+ to balance this...i have no idea what I'm doing.. i'm just try…

Well, since there really hasn't been too many interesting new threads in this section, and since this is driving me insane that I can't figure this out, I'll just ask everyone here [ce]CaCl2(aq) + H2O + KCl --> KClO3 +??[/ce] The chlorate precipitates at cold temps, I know that, but I can't stoichiometrically balance it! AAAAAAAAAAAAAAAAA! Also, while I have this thread open, I was reading online somewhere (and it may have been a totally unreliable sorce) that when you have a salt dissolved in water, you can add ethyl alcohol conc. to it and it will help the salt precipitate? And no, I do not plan on making a bomb or anything like that. This is p…

I just got a 14/20 ground glass distillation kit with 2 condensers,5 rb flasks,a 105° bend vacuum adapter,a three way clasien adapter, and a three way 75° adapter for 75$.Help using it. does some one have some advise.

This a question about legitimacy of americium in smoke detectors: can i take out the button of Am-241 out and say dissolve it in nitric acid?

hey all! i made some ferric chloride the other day and it was a nice vibrant greeny yellow colour, but over time it had turned brownish. It is stored in a jar. Would the stuff in the jar still be ferric chloride? Thanks, rick