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lalala1212
21.08.2019 •
Chemistry
In a redox reaction, the substance that accepts electrons is said to be
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Ответ:
Ответ:
13.04%
Explanation:
KIO₃, IO₃⁻, reacts with KI, I⁻, thus:
IO₃⁻ + 8I⁻ + 6H⁺ → 3I₃⁻ + 3H₂O
Producing triiodide ion.
KIO₃ is limiting reactant, moles are:
0.05000L ₓ (0.00885mol /L) = 4.425x10⁻⁴ moles.
Moles of I₃⁻ produced are:
4.425x10⁻⁴ moles KIO₃ ₓ (3 moles I₃⁻ / 1 mole IO₃⁻) = 1.3275x10⁻³ moles I₃⁻
This iodine reacts with Na₂S₂O₃ and AsCl₃, As³⁺, thus:
I₃⁻ + 2S₂O₃²⁻ → 3I⁻ + S₄O₆²⁻
I₃⁻ + As³⁺ → 3I⁻ + As⁵⁺
Moles of I₃⁻ that react with Na₂S₂O₃ are:
0.0500L ₓ (0.02000mol / L) = 1.000x10⁻³ moles Na₂S₂O₃
1.000x10⁻³ moles Na₂S₂O₃ ₓ (1 mole I₂ / 2 moles Na₂S₂O₃) = 5.000x10⁻⁴ moles I₃⁻.
That means moles of I₃⁻ that react with As³⁺ are:
1.3275x10⁻³moles - 5.000x10⁻⁴moles = 8.275x10⁻⁴ moles I₃⁻. As 1 mole of I₃⁻ reacts per mole of As³⁺, moles of As³⁺ are 8.275x10⁻⁴ moles.
Molar mass of AsCl₃ is 181.28g/mol. 8.275x10⁻⁴ moles weight:
8.275x10⁻⁴ moles ₓ (181.28g / mol) = 0.1500g of AsCl₃
As the weight of the sample is 1.150g, mass percent of AsCl₃ is:
0.1500g / 1.150g ₓ 100 =
13.04%