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Консультация № 124905
26.02.2008, 13:38
0.00 руб.
0
1
1
к кислотному раствору KJ прибавили 20.00 мл (см"куб") 0.1133H KMnO4(f эквив =1/5) и выделившийся йд оттитровали 25.9 см"куб" раствора Na2S2O3. расчитать молярную концетрацию эквивалента раствора Na2S2O3. Ответ : 0.08749 моль/л
Обсуждение
Неизвестный
26.02.2008, 13:56
общий
это ответ
Здравствуйте, Leopold7!
Пишем уравнения реакций:
10J<SUP>-</sup> + 2MnO<SUB>4</SUB><SUP>-</SUP> + 16H<SUP>+</SUP> = 5J<SUB>2</SUB> + 2Mn<SUP>2+</SUP> + 8H<SUB>2</SUB>O
J<SUB>2</SUB> + S<SUB>2</SUB>O<SUB>3</sub><SUP>2-</SUP> = S<SUB>4</sub>O<SUB>6</sub><SUP>2-</sup> + 2J<SUP>-</sup>
Согласно закону эквивалентности, количества эквивалентов реагирующих веществ равны. Тогда количество эквивалентов тиосульфата натрия равно количеству эквивалентов иода, которое равно количеству эквивалентов перманганата калия. Отсюда, N<SUB>S2O3</sub> * V<SUB>S2O3</sub> = N<SUB>MnO4</sub> * V<SUB>MnO4</sub>
N<SUB>S2O3</sub> = N<SUB>MnO4</sub> * V<SUB>MnO4</sub> / V<SUB>S2O3</sub> = 0.1133 * 0.02000 / 0.02590 = 0.08749 н.
Совпадение с Вашим ответом полное.
С уважением, Товарищ Бородин
Пишем уравнения реакций:
10J<SUP>-</sup> + 2MnO<SUB>4</SUB><SUP>-</SUP> + 16H<SUP>+</SUP> = 5J<SUB>2</SUB> + 2Mn<SUP>2+</SUP> + 8H<SUB>2</SUB>O
J<SUB>2</SUB> + S<SUB>2</SUB>O<SUB>3</sub><SUP>2-</SUP> = S<SUB>4</sub>O<SUB>6</sub><SUP>2-</sup> + 2J<SUP>-</sup>
Согласно закону эквивалентности, количества эквивалентов реагирующих веществ равны. Тогда количество эквивалентов тиосульфата натрия равно количеству эквивалентов иода, которое равно количеству эквивалентов перманганата калия. Отсюда, N<SUB>S2O3</sub> * V<SUB>S2O3</sub> = N<SUB>MnO4</sub> * V<SUB>MnO4</sub>
N<SUB>S2O3</sub> = N<SUB>MnO4</sub> * V<SUB>MnO4</sub> / V<SUB>S2O3</sub> = 0.1133 * 0.02000 / 0.02590 = 0.08749 н.
Совпадение с Вашим ответом полное.
С уважением, Товарищ Бородин
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