Inorganic Chemistry Answers

Hello,

I have a solution that contains a mixture or Cr3+ and Fe3+ and the solution is very alkaline.
I want to know the amount of Iron in it, the thing is with Cr3+ it's difficult because it reacts also with the substance I add to titrate.
Is there a way to determine the amount of Iron ions without getting influenced by Cr3+ ?

Thank you

Enthalpy of bond S-O is stronger in SO3 or SO3^2-?

25.3g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250ml of solution. If sodium carbonate dissociates completely , molar concentration of sodium ion , Na+ and carbonate ions are respectively?

1 gram of a mixture of caco3 and nacl reacts completely with 120 ml of 0.1N HCl. what is the percentage of NaCl?

what are penultimate shells?

You are presented with three identical metal containers of about 5 liters capacity, each about half full of fuel. The containers have short neck and normally closed by a screw cap of about 30mm diameter. The cans contain
1. petrol (gasoline, flashpoint -43)
2. methyl alcohol (methanol, flashpoint 11 C)
3. parrafin (kerosine, flashpoint 50 C)

explain concisely what would happen if the top was taken off and a lit match was immediately dropped into the head space of each cans. Assume ambient temperature and thus that of liquids is 15 C

in order to initiate combustion in solids materials, it is usually necessary to raise their temperature by means of an external source. Under certain conditions, however some material may generate the necessary heat internally. Give two examples materials that can exhibit this phenomenon. In each case state how internal heating arises and outline the precautions that should be taken when they are stored to prevent combustion occurring

if cold water is heated andthe hot water shows pH little less than 7. this is because of (A) hot water become little acidic.
(B) dissociation of water increases
(C) thermal energy is acidic in nature
(D) silicate ions of glass get dissolved