3 years ago

Chemical Reactions:Question 3

Chemistry

1 answer:

photoshop1234 [79]3 years ago

7 0

Answer:

because of how big it is

Explanation:

frgftvtv

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Witch compound has an element ratio of 2:1

rusak2 [61]

Answer:

Water

Explanation:

Because the ratio with which hydrogen and oxygen combine is 2:1. I.e for every molecule of water there will always be

two atoms of hydrogen combined with one atom of oxygen.

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What is the pH of a 0.300 M NH₃ solution that has Kb = 1.8 × 10⁻⁵ ? The equation for the dissociation of NH₃ is: NH₃ (aq) + H₂O

nalin [4]

Answer:

11.4

Explanation:

Step 1: Given data

Concentration of the base (Cb): 0.300 M

Basic dissociation constant (Kb): 1.8 × 10⁻⁵

Step 2: Write the dissociation equation

NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)

Step 3: Calculate the concentration of OH⁻

We will use the following expression.

$[OH^{-} ]=\sqrt{Kb \times Cb } = \sqrt{1.8 \times 10^{-5} \times 0.300 } = 2.3 \times 10^{-3} M$

Step 4: Calculate the pOH

We will use the following expression.

$pOH =-log[OH^{-} ]= -log(2.3 \times 10^{-3} M) = 2.6$

Step 5: Calculate the pH

We will use the following expression.

$pH+pOH=14\\pH = 14-pOH = 14-2.6 = 11.4$

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3 years ago

Write chemical equations for the reactions that occur when solutions of the following substances are mixed:

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a) HNO₂ + C₂H₇NO → N₂ + C₂H₆O + H₂O

b) H₃O⁺ + F⁻ → HF + H₂O

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