How do you standardise HCl, HNO3 and H2SO4?

€¢ I am currently carrying out an iodine clock reaction between peroxodisulphate and iodide ions. I have determined the rate equation (I got first order wrt both reactants), calculated the activation energy ( approx 50 kJ mol-1), and now must investigate the catalysts. I have no idea how to even plan what catalysts I am required to try.

Is it just trial and error or is there a way of determining what solutions are most likely to catalyse my reaction? I understand that solutions such as Fe2+ are useful as they form Fe which will then react further. However it was mentioned that using redox potentials is the main way of determining what to use.

This has just utterly confused me. How would I go about this? Thank you!

€¢ For my practical investigation, I am trying to determine the acid content of wines but have had difficulty finding the end point of titrations with NaOH. When using phenolphthalein indicator the colour change was very gradual, so I have used a pH meter to plot curves of ... more.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.