Hi! I've got a beginner question. I'd like to know what quantities are required to make a couple solutions, but I'd also like to understand how the calculations are made. I have 95-98% H2SO4 and 28-30% NH4OH, and I'm attempting to figure out the values to make 100ml of 5% H2SO4 w/w and also 100ml 10% NH4OH w/w. I previously didn't know what w/w meant, but I looked it up and saw that w/w stipulates that the ratio is to be based on mass. If this means that I need to calculate based on the H2SO4 and NH4OH molarity's of 98.079 g/mol and 35.04 g/mol respectively, then I really am lost. But then, it might be as basic an issue as ensuring that my H2SO4 makes up 5% of 100ml, and then topping the remainder up with H2O until I hit the 100ml mark. I'm guessing that my mind is making this out to be more complex that it really is. Can someone please tell me the amounts of H2SO4, NH4OH, and H2O to use for both solutions, and also maybe crash course me on the method used to calculate solutions based on w/w? Thank you.