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3 years ago

What is the pH of a solution with a concentration of 4.2 x 10−5 M H3O+? (4 points)

Chemistry

1 answer:

zheka24 [161]3 years ago

4 0

Answer:

1) b. 4.38

2) d. 10.7

Explanation:

1) The problem tells us that [H₃O⁺] = 4.2x10⁻⁵ M, and keeping in mind that [H₃O⁺]= [H⁺], we can calculate the pH of the solution:

pH = -log[H⁺] = 4.38

2) First we calculate the pOH of the solution:

pOH = -log[OH⁻] = -log(4.6x10⁻⁴) = 3.33

Then we calculate the pH using the following formula:

pH = 14 - pOH = 14 - 3.33

pH = 10.7

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2 years ago

The airbags that protect people in car crashes are inflated by the extremely rapid decomposition of sodium azide, which produces

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1. NaN₃(s) → Na(s) + 1.5 N₂(g)

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1. Write a balanced chemical equation, including physical state symbols, for the decomposition of solid sodium azide (NaN₃) into solid sodium and gaseous dinitrogen.

NaN₃(s) → Na(s) + 1.5 N₂(g)

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