What does this phrase means, "0.5M in sulfuric group of poly(4-styrenesulfonic acid) (PSS)"?

01 January 2019 1 2K Report

I dont understand how to prepare the solution because i dont understand what does it mean, and i dont know the conc. of the PSS stock solution.

Paul Milham

If there is one sulfonic acid group per molecule of the compound, then you need 0.5 moles/L of the compound ......

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