 So, what I want to do is just have a little bit of a look at some of these and see if we can identify some very important factors that contribute to either our environmental, our social or our economic implications when we're looking at processes like this. So, the first thing we've got to do is we've got to get the sulfur out of the ground and this is a nice little visual learning aid from Nelson that I thought would be quite useful just to give you a bit of an overview of the actual production process for sulfuric acid. So we start with our sulfur which we've extracted from the Earth's crust and that can be done either through smelting of ores or it can also be done through the fresh process as I talked about earlier. What we then want to do is we want to combine the sulfur with oxygen in order to produce sulfur dioxide. Now, this naturally will occur in the atmosphere particularly if we've heated up the sulfur to melt it to turn it from a solid into a liquid and then bring it to the surface. Often it will do that inside of some water so often very hot high-pressure water. So it's already very warm we know the reaction rate increases with increasing temperature so there are some environmental implications if some of the sulfur does this in the atmosphere because it will go through exactly the same process just not in a controlled way and we'll end up with acid rain as a very important environmental consequence. So that's what happens if we don't control the process. If we do control the process hopefully what we're able to do is to use the contact process to move the sulfur dioxide towards sulfur trioxide. This is an equilibrium so it's going to have some important consequences particularly economically as we work out how we maximize our yield while we maintain aspects of industrial safety and also environmental responsibility. So you want to make sure that you've talked a little bit about each of those. Now one of the interesting things here is this product Ollium and you can see what we've done in order to do this is to add some sulfuric acid H2SO4 to our sulfur trioxide. So if you just add all these light turns we've got two hydrogens we've got two sulfas and we've got three and four which is seven oxygens and this is what produces our Ollium. Now Ollium is much safer to be using often the sulfuric acid can be produced as a mist because we're going to be adding water to get it straight straight down in this direction. So we will also add water to our Ollium and that means we'll have H4S2O8 which is two lots of H2SO4. So that's where we can take our Ollium, add it to water it's a little safer for us to produce our sulfuric acid as our final product. When you're looking at any of these industrial processes there's actually a lot involved in them and I've kind of skated very quickly across the top because I want you to start to look at some of these processes do a little bit of reading think about them in the context of those very important factors that we've been looking at that are critical to your understanding of any industrial process. Remember what we want to do is what we want to look at availability availability of reactants or of reagents we also want to look at reaction conditions we're interested in yield and and purity we're also interested in industrial use and how these can be expanded to increase demand and also as we've looked at finally some of these broader issues. It's interesting too to have a look at how chemistry is continuing to change we talk about atom economies we talk about green chemistry now we're much more environmentally aware than we used to be about the sorts of impacts that chemical reactions have on the environment and on ourselves on our populations and on the areas in which we live so we're trying to be much more sensitive now to what are the implications of each of these different types of industrial processes and how we make sure that we consider all of the issues and all of the factors that contribute.