Recent content by stamba

Oh , sorry! I haven't read this before. I won't do it again. o:) Promise! Sorry, about this, all.

a. true b. true c. Kb = [NH4+]*[OH-]/[NH3], [NH4+] = [OH-], [H2O] doesn't goes in equation, because concentracion of water is constant, 55.555...mol/dm3 d. [NH4+] = [OH-]

Hello. Can you please help me with this reaction? * KBr + NaOH --> ?* Put KBr in boilling solution of NaOH. What are the products?

Second... Now, first you need to do is to write the equation: 2Mg + O2 --> 2MgO Now, you will need to turn 770 mmHg to pascales. This is the way: 760mmHg is 101325Pa that would meen that 770mmHg is 100010Pa. 80oC needs to be turned to kelvines. How? Look: T = t + 273.15K, that is...

Understand? Full answer: 1) You need to use pV=nRT from this equation you know: p=1.5 atm Since, 1atm = 101325Pa, then 1.5atm would be 151987.5Pa R=8.314 Jmol-1K-1 T=290K You need to calculate number of moles (n) This is the way: C3H8 has a molecular mass of 44 (mass of carbon (12)...

Reply Hi. 1. Correct! 2. Correct! 3. Ni2+ + S2- --> NiS(s) NiS is solid black substance. It doesn't dissolve in water. 4. PH3 + BCl3 --> PH3BCl3 PH3BCl3 is solid, PH3 and BCl3 are gasses.

Can anyone explaine to me why there is exacly 11 dimensions :bugeye: , why not 13 or 7? I have searched a lot but I have not found it anywhere. Thanks, Stamba

No you can't do in that way, beaucouse you also have magnesium ions in milk, they will also form Mg(OH)2, which is also insoluble in milk.If you plan to heat the milk, you will get nothing beaucouse many organic supstances will fall down as insoluble substances. As far as I know this is the...

I ment in the other way: KO2 ----> K + O2 On what temperature it happens? Thanks.

I think that you have to do is this: FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl Then just heat it up t Fe(OH)3 -----> Fe2O3 + H2O

I think that you can determin it in this way In one beaker which volume is 250 cm3, put 50 cm3 of your sample. Add 5 cm3 of NaOH which has 2 mol/dm3 and on tip of a spoon indicator mureksid. You do titration with 0.025 mol/dm3 EDTA until color is changed from blue to violet-blue. You...

Temperature of Potassium superoxide Hello, Does anyone know what are the temperatures of Potassium suproxide, potassium peroxide and potassium oxide on which they fall apart(oxigen goes away)? How can I make KO2 in some syntesis?

Proton is positive beaucouse the first subatomic particle that was discovered is positivly charged, and that particle was named proton. It name comes from latin word PROTOS which means the first and the most important. When other particles were discovered they were given names that suite them...

Thanks Thank you. I will just check it out. Thanks again.

Hello, Please help me. I need potassium superoxide for my experiments, but I have no place to buy it. I am from Yugoslavia and it seems that no one is shipping it. If you know anyplace please send on my mail: stamba@absolutok.net or answer here. Thanks.