137. Solving a chemistry problem

To determine sulfur (VI) oxide in cement, a sample of cement weighing 1.0000 g was dissolved, filtered, and the solution was passed through a chromatographic column containing a cation exchanger in the H + form. The eluate and washings were collected in a volumetric flask with a capacity of 100.0 ml, brought up to the mark with water. 25.00 ml of the resulting solution was titrated potentiometrically on an autotitrator with 0.1000 M sodium hydroxide solution, using 1.56 ml of titrant solution. Determine the concentration of sulfur oxide (VI) (w,%)