2. The sulfate contained in 1.515 g of the sample was precipitated by adding 50.0 ml of 0.0264 M BaEDTA solution and slowly acidified to release barium ions. After precipitation was complete, the solution was buffered to pH=10.0 and diluted to exactly 250 ml. 28.7 ml of 0.0154 M MgCl2 solution were required to titrate 25 ml of the resulting solution. Calculate the mass fraction of sodium sulfate decahydrate in the sample.

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