Kateriна
19.02.2021 16:14

Определите концентрацию раствора (%), полученного при электролизе
250 г 5,85% раствора NaCl с силой 5 А в течении 4825 секунд.

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Ответ:
nlapenko
30.06.2020 08:00

Пункт 1 (молекулярные уравнения).

1). 4Al + 3O2 = 2Al2O3

2). Al2O3 + 6HCl = 2AlCl3 + 3H2O

3). AlCl3 + 3NaOH = Al(OH)3 + 3H2O

4). Al(OH)3 + 3HNO3 = Al(NO3)3 + 3H2O

Пункт 2 (полное и сокращенное ионные уравнения).

Al(OH)3 + 3HNO3 = Al(NO3)3 + 3H2O

Аl(3+) + 3OH(-) + 3H(+) + 3NO3(-) = Al(3+) + 3 NO3(-) + 3H2O

H(+) + OH(-) = H2O.

Пункт 3 (ОВР).

4Al + 3O2 = 2Al2O3

Аl(0) -3е = Al(+3) - процесс: окисление, Al - восстановитель;

O2(0) +4е = 2O(-2) - процесс: восстановление, O2 - окислитель.

Пункт 4 (название веществ).

Al - алюминий;

O2 - кислород;

Al2O3 - Оксид алюминия;

HCl - соляная кислота;

AlCl3 - хлорид алюминия;

H2O - вода;

NaOH - гидроксид натрия;

Al(OH)3 - гидроксид алюминия;

HNO3 - азотная кислота;

Al(NO3)3 - нитрат алюминия.

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Ответ:
nastyapetrova011
24.02.2023 16:59

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