In an ore, the only oxidizable material is `Sn^(2+)`. This ore is titrated with a dichromate solution containing `2.5g` of `K_(2)Cr_(2)O_(7)` in `0.5 "litre"`. A `0.40 g` sample of the ore required `10.0 cm^(3)` of titrant to reach equivalence point. Calculate the percentage of tin in ore.

Explanation

`3Sn^(2+) + Cr_2O_7^(2-) + 14H^(+) to 3Sn^(4+) + 2Cr^(3+) + 7H_2O`