When chlorine is added to a solution containing bromide or iodide ions, a colour change occurs. What solvent would you add to the mixture to confirm the identity of the halogen produced?
Is it not AgNO3...? and the result a cream ppt? (next question asked the result for if bromine was produced)
When chlorine is added to a solution containing bromide or iodide ions, a colour change occurs. What solvent would you add to the mixture to confirm the identity of the halogen produced?
Is it not AgNO3...? and the result a cream ppt? (next question asked the result for if bromine was produced)
you add acidified silver nitrate (acidified to get rid of any unwanted ions i.e CO32-) the result would be cream ppt of silver bromide.
you add acidified silver nitrate (acidified to get rid of any unwanted ions i.e CO32-) the result would be cream ppt of silver bromide.
The mark scheme says 'A hydrocarbon (solvent) / volasil /named hydrocarbon solvent /tetrachloromethane' and 'Red / brown /orange / amber / yellowOr any combinationNo TE on incorrect / no reagent' for the result Q
When chlorine is added to a solution containing bromide or iodide ions, a colour change occurs. What solvent would you add to the mixture to confirm the identity of the halogen produced?
Is it not AgNO3...? and the result a cream ppt? (next question asked the result for if bromine was produced)
Yeah AgNO3 is the common standard; will produce Ag+ ions in the mixture and it's the precipitate that forms with the halide ions you react it with that will give you the different colours.
AgBr is cream coloured if I remember correctly AgI is yellow.
Yeah AgNO3 is the common standard; will produce Ag+ ions in the mixture and it's the precipitate that forms with the halide ions you react it with that will give you the different colours.
AgBr is cream coloured if I remember correctly AgI is yellow.
You add silver nitrate as a standard method to getting a ppt
Let's say you've got a solution of bromoethane, you add sodium hydroxide to it, these react releasing the Br- ion, I'm going to assume that you know the mechanism behind this? But now youve got bromide ions in the solution, after the addition of silver nitrate you should be getting a ppt of the silver bromide.
You add silver nitrate as a standard method to getting a ppt
Let's say you've got a solution of bromoethane, you add sodium hydroxide to it, these react releasing the Br- ion, I'm going to assume that you know the mechanism behind this? But now youve got bromide ions in the solution, after the addition of silver nitrate you should be getting a ppt of the silver bromide.
That's not what it says on the mark scheme. I quoted you previously
I am going over Hess' law cycles and I can't seem to remember why standard enthalpy change of formation always needs 1 mole of product on the right hand side and why combustion always has 1 mole of elements and compounds on the left side of the equation.
I am going over Hess' law cycles and I can't seem to remember why standard enthalpy change of formation always needs 1 mole of product on the right hand side and why combustion always has 1 mole of elements and compounds on the left side of the equation.
All I know is that it does! But whyyy?
Thanks
Because that's the definition: " Energy change of formation is the energy change when 1 mole of a compound is formed from its constituent elements in their standard states under standard conditions(298K 1atm)
Energy change of combustion is the energy when 1 mole of a substance is completely burned in an excess of oxygen under standard conditions " "
May you look at my post and help me please? I forgot about those things
Because that's the definition: " Energy change of formation is the energy change when 1 mole of a compound is formed from its constituent elements in their standard states under standard conditions(298K 1atm)
Energy change of combustion is the energy when 1 mole of a substance is completely burned in an excess of oxygen under standard conditions " "
May you look at my post and help me please? I forgot about those things