118. Solving a chemistry problem

47. A portion of iodoform CHI3 was fused with solid KOH, the melt was dissolved. An acid was added to the resulting solution of KI, and I- was oxidized by the action of chlorine water to
IO3-. Excess chlorine was removed by boiling, then KI was introduced into the solution, and the released I2 was titrated with 23.22 ml of Na2S2O3 solution with T to I2 = 0.02560 g/ml. What mass of CHI3 was taken for analysis.