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Helen [10]
2 years ago
15

PLEASE HELP ME

Chemistry
1 answer:
solmaris [256]2 years ago
3 0

Answer:

A. Compound

B. Element

c. Compound

d. Mixure

e. Element

F. Compound

Srry but i don't know if its correct srry

Hope his helps

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NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.084 M in
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Answer is: pH of solution is 5,17.
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c(NH₄Cl) = 0,084 M = 0,084 mol/L.
Chemical reaction: NH₄⁺ + H₂O → NH₃ + H₃O⁺.
Ka · Kb = 10⁻¹⁴.
Ka(NH₄⁺) = 10⁻¹⁴ ÷ 1,8·10⁻⁵.
Ka(NH₄⁺) = 5,55·10⁻¹⁰.
[H₃O⁺] = [NH₃]  = x.
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5,55·10⁻¹⁰ = x² ÷ (0,084 M - x).
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