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As the thiosulphate in crystalline form has the formula Na S O .5H O, this weight is 248.12 grams. Tenth-normal or hundredth-normal solutions are generally used. !Approximate Strength, 0.1 N! PROCEDURE. Weigh out on the rough balances 13 grams of commercial iodine. Place it in a mortar with 18 grams of potassium iodide and triturate with small portions of water until all is dissolved.
Such solutions are called !Normal Solutions! and contain such an amount of the reacting substance per liter as is equivalent in its chemical action to one gram of hydrogen, or eight grams of oxygen. Solutions containing one half, one tenth, or one one-hundredth of this quantity per liter are called, respectively, half-normal, tenth-normal, or hundredth-normal solutions.
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