Inorganic Chemistry

Hi There is a chemistry problem that I'm really not able to do. It's basically the reaction of Lanthanum with Hydrogen to produce the nonstochiometric compound LaH2.90 . So, if we know that the compound contains Hˉ, La⁺² and La⁺³ (yeah its a little 3 there), how can we know the fraction of La⁺² and La⁺³ present in the compound? I know that the answer will be 10.9% La+2 and 90%La+3....but I have NO IDEA on how to get that... I'm not asking for HOW to do it completely, but just clues that can guide me into finding the answer... Thanks in advance,

would a LOx(liquid oxygen) and high octane gasoline mixture increase the energy output of an internal combustion engine? could this be used in a generator to increase its output?

So, another basic question (no pun intended). Acids and their conjugate bases. The definition of a conjugate base is the resulting base after the hydrogen(s) have been removed from the acid. I.e. acid CH3COOH has a conjugate base of CH3COO-. I also understand that, by definition, the stronger an acid the weaker the conj base. The fact that the conjugate base is weak is WHY the acid is strong because the base cannot hold onto the proton. I.E. H2SO4 (Very strong acid, Ka = 1.0 * 10^3) IS so strong specifically because HSO4- (Kb = 1x10^-17) is such a weak base that it can't hold onto the H+ in solution. The fact that Kb = Kw / Ka (where Kw = 1x10^-14) me…

Hello, I would like to find a way to convert copper chloride to copper nitrate. Is there any way that a single or double replacement reaction would be possible? Or if you have any other suggestions any help is appreciated.

Hi folks. I'm gonna need to make some [Ru(bpy)3]3+ (perchlorate salt). Any good tips on the synthesis and the precipitation/crystallisation of it? Regards Pedro

Hi, I am just about to start a project on polyoxometalates and was wondering if anyone had any new and exciting to share. I need to start with a literature review so any pointers to some good review papers would be appreciated. I want to focus my review on the properties of POMs and their potential applications. Any input on the following would be helpful: 1. POM redox properties and the potential application of this 2. POM applications in catalysis 3. Chirality in POMs and potential applications 4. POMs as tools for drug delivery Feel free to contribute anything! Thanks Ally

if i had copper(II) sulphate, and i needed to test for copper ions, could i do this by titration, and if so, what solution would i use? also, if it can be done, can it be done the same for other copper salts?

I'm doing a lab report for an experiment about gas laws for my college chemistry class. One question is, "Use P total = P atm = P gas + P water to calculate the partial pressure of the butane gas collected." How would I figure out this problem? I also have P atm = 0.9733 atm, volume of gas is 94.2 mL, temperature is 21 degrees C from my data if this helps. Thank you!

For an investigation i've got to do in A-level Chemistry, i need to make Copper(II) Ammonium sulphate from scratch, could anyone please help me out as to how to do this as i haven't got a clue what to use

Can anyone tell me what Hansen solubility parameter (HSP) distance, Ra, is?

why there were two peak when i used Cr(NO3)3 as the sample for uv/vis spectrophotometry? and the graph is absorption against vawelength, how to convert the graph to absorption against concentration?

1)All strong acids in the aqueous solution appear almost equally strong ,i.e, they ionise completely and their relative strength cannot be compared. This phenomenon is known as levelling effect. What's the cause of this ? 2)Flourine is the most electronegative element in the periodic table, still HF is considered to be the strong acid and it has no basic properties at all ( I read this in one book). But I have a doubt since it is electronegative shouldnt it have the tendency of attracting the proton towards itself. And why is it so strong that even the strongest acid such as nitric acid also behave like base when treated with HF ?

please guide,how can i derive 0.28% cu from cuso4? as i know molecular weight of cuso4 is 159 and % of cu is 39.62, but how rest sulfur would be excluded ?as sulfur is not required in the composition and likewise how will exclude nitrate after taking cobalt from cobalt nitrate? and phospate after taking potash from potassium-phosphate.

I want to Syntesis TiCl4, here I find this reaction: TiO2 + 2Cl2 + C > TiCl4 + CO2 I know that this reaction occurs around 900 degree celcius. If you think that this reaction is possible with borosilicate glassware please tell my. 30122929-Titanium-Compounds-Inorganic.pdf

when reactants and products are pure solids or liquids ,their concentrations are taken as constants , why ?

hi can someone tell how many time its will take us to see nanotechnology food and fuel soft machines on earth pls? links will be welcome too to these isuues

So Now I've got a better power suplly I didnt the age old thing. Salty water and copper electrode. You know the story, You get (blue) copper hydroxide and (brown) copper oxide. The copper hydroxide will decomposses if over a certain temperature. So I thought lets cool it and try and make just copper hydroxide. So I Let the salty water sit in the freezer until nice and cool and then placed in a ice bath just to make sure. But I didnt get copper hydroxide. I got a green/brown precipitate. I'm sure I made copper chloride. I tested this by taking a sample of the sludge and adding Sodium hydroxide. I got copper oxide precipitate and copper hydroxide …

I'm trying to refine gold using nitric acid (NOT aqua regia). Will the non-gold components dissolve and leave behind pure gold, or will the fact that it's an alloy somehow prevent the individual components from dissolving?

Why acids have a small pK value while bases have a higher pK value ?

Would the energy of a phase change (let's say going from a gas to a liquid) be equal to the energy of all newly formed intermolecular bonds being formed as the gas transitions to liquid?

I can't conceptualize this very well. I understand the principle - a solute in a solvent will decrease the surface area that the solvent has. This means fewer molecules of the solvent can escape. This means that at equilibrium, fewer molecules can enter the liquid and escape from it (it's a one-in, one-out situation). What I don't understand is how this decreases vapor pressure. In my mind, the surface area only determines the rate of establishing equilibrium. The rate of molecules escaping the solvent is lower, but that just means it should take longer to reach equilibrium - not change the pressure. A change in pressure would insinuate that fewer molecules are in th…

what is inert pair effect and what is its trend does it increse or decrese down the group?

Ok. Let me start by saying Hi!! I am new to this forum. Ok, so I am doing a project on colour in elements and compounds, and I came upon a few problems: 1) Ok, so transition metals are coloured because they have unpaired electrons which get excited and move to higher energy levels when light hits it. It is coloured because the energy emitted by the electron when it goes back to ground state is within the range of visible light. But what about non-metals? Most of them are coloured. Also, non-transition metals like caesium (goldish), magnesium (greyish -black) and francium (reddish) in group 1 are coloured. What is the reason for this? 2) Coloured gases : Some gases l…

Hi I have a question and anybody's help would be welcomed. I tried making aqua regia to dissolve gold nanoparticles. I tried 4:1, 3:1 and 2:1 of HCl:HNO3 concentration ratio (in volume). Everywhere I read about aqua regia, it is said that it will produce some fumes but I didn't get any. Could it be because my acids are not concentrated enough? Both have a concentration of 50%. Will it dissolve my nanoparticles anyway? Thank you

I have prepared a solution of Nickel Chloride by dropping some Nickel metal shavings in concentrated HCl, and after a few days, the result is a bright, dark emerald green liquid, that still contains a lot of hydrochloric acid. What would be the best way to neutralize the HCl without contaminating the solution with another salt? What i mean to say is the logical choice would be to add some NaOH until I get a 7.0 PH, but it would create unwanted NaCl in my relatively pure solution (I used reagent grade HCl and 99.9% pure Ni). I thought of boiling off the solution but I don't know if I would succesfully drive off all the remaining HCl from my NiCl2. And I don't think…