Hi, I am looking for some guidance for calculating the amount of H2SO4 required to reduce the pH of a Reactor outlet stream from 8.7 to somewhere in the 1.5-2.0 region. The stream contains a number of components in varying amounts such as C8H8O2, NaOH, H2O, Na2HPO4, NaH2PO4, C8H12N2O3S and C16H18N2O4S I am free to select the concentration of H2SO4 I use. I am new to pH calculations and I am wondering how to go about the calculations? Is it as straight forward as needing to calculate the amount of H2SO4 required to reduce the pH of each individual component then sum for the total amount used? I need to have a material balance for my stream post pH reduction so do I need to consider any reactions that will take place when stating the composition of the steam after acid addition? i.e. for the NaOH component: H2SO4 + 2NaOH = 2H2O + Na2SO4 So will the stream post pH reduction will have a new material balance based on the products of any reactions? Any pointers in the right direction would be appreciated as I seem to be going around in circles on this one. All the research examples I have read deal with 1:1 mixtures and not pH reduction of a multi component stream. Thanks.