How does winter affect the narrator in the passage?

Remember from the buffering capacity note, tell me which of the following acids(and their salts) can make the best buffered solu

lakkis [162]

Answer:

The answer is Benzoic acid. Hence, (C) is the correct answer. The acid with the ratio [HA] / [A-] closest to 1 is the best because a buffer is most effective when the amounts of acid and conjugate base are approximately equal and hence their ratio should be close to 1.

Explanation:

pH = - log₁₀[H⁺]

[H⁺] = 10∧-pH

Given,

pH = 4.30

Chloroacetic acid (Ka = 1.35 x 10^-3)

Propanoic acid (Ka = 1.30 x 10^-5)

Benzoic acid (Ka = 6.40 x 10^-5)

Hypochlorous acid (Ka = 3.50 x 10^-8)

Using the Hints,

The required [H+] = 10⁻⁴°³ => 5.011 x 10⁻⁵

Using the formula,

Ka = [H+] [A-] / [HA] and finding [HA] / [A-] values for each of the given acids.

[HA] / [A-] = [H+] /Ka

Substituting the values,

For Chloroacetic acid, [HA] / [A-] = 5.011 x 10⁻⁵ / 1.35 x 10⁻³ => 0.037

For Propanoic acid, [HA] / [A-] = 5.011 x 10⁻⁵ / 1.30 x 10⁻⁵ => 3.85

For Benzoic acid, [HA] / [A-] = 5.011 x 10⁻⁵ / 6.40 x 10⁻⁵ => 0.782

For Hypochlorous acid, [HA] / [A-] = 5.011 x 10⁻⁵ / 3.50 x 10⁻⁸ => 1431.714

As Benzoic acid has [HA] / [A-] value closest to 1, it can make the best buffered solution.

The acid with the

ratio [HA] / [A-] closest to 1 is the best because,

A buffer is most effective when the amounts of acid and conjugate base are approximately equal and hence their ratio should be close to 1.

6 0

2 years ago

Balance of trade summarizes

Zepler [3.9K]

C the flow of goods and services.

4 0

3 years ago

Eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeek

Vladimir79 [104]

Answer:

Karen has a total amount of $ 101

Maria has a total amount of $ 86

Explanation:

We'll begin by obtaining an expression for the total amount of money in Karen's account. This can be obtained as follow:

Let the number of weeks be x

Let the total amount be y

Karen deposited $ 28 when she opened the account and then deposit $ 5 weekly.

The total amount in x week can be written as:

y = 28 + 5x

For Maria, the total amount in x week is given by:

y = 8x + 7

Next, we shall determine the number of weeks in which they both have the same amount in their account.

For Karen's account, the total amount is:

y = 28 + 5x

For Maria's account, the total amount is:

y = 8x + 7

Total in Karen's = Total in Maraia's

28 + 5x = 8x + 7

Collect like terms

28 – 7 = 8x – 5x

21 = 3x

Divide both side by 3

x = 21/3

x = 7

Thus, they both have the same amount in the 7th week.

Next, we shall determine the total amount in each account in the 7th week. This is illustrated below:

For Karen's account,

y = 28 + 5x

x = 7

y = 28 + 5(7)

y = 28 + 35

y = $ 63

For Maria's account,

y = 8x + 7

x = 7

y = 8(7) + 7

y = 56 + 7

y = $ 63

Finally, we shall determine the total amount in each account 2 weeks after they have the same amount in their account. This is illustrated below:

For Karen's account,

y = 28 + 5x

x = 2

y = 28 + 5(2)

y = 28 + 10

y = $ 38

Total amount = 63 + 38 = $ 101

For Maria's account,

y = 8x + 7

x = 2

y = 8(2) + 7

y = 16 + 7

y = $ 23

Total amount = 63 + 23 = $ 86

SUMMARY:

Karen has a total amount of $ 101

Maria has a total amount of $ 86

5 0

3 years ago

Aquatic biomes contain biodiversity in plants and fish Identify and explain 1 economic and 1 environmental impact caused by huma

ipn [44]

Answer:Coral reefs are some of the most diverse ecosystems in the world. Coral polyps, the animals primarily responsible for building reefs, can take many forms: large reef building colonies, graceful flowing fans, and even small, solitary organisms. Thousands of species of corals have been discovered; some live in warm, shallow, tropical seas and others in the cold, dark depths of the ocean.

Because of the diversity of life found in the habitats created by corals, reefs are often called the "rainforests of the sea." About 25% of the ocean's fish depend on healthy coral reefs. Fishes and other organisms shelter, find food, reproduce, and rear their young in the many nooks and crannies formed by corals. The Northwest Hawaiian Island coral reefs, which are part of the Papahānaumokuākea National Marine Monument, provide an example of the diversity of life associated with shallow-water reef ecosystems.

Explanation:

7 0

3 years ago

What are the issues with hypnotic regression.

gizmo_the_mogwai [7]

Past life regression. Past life regression is a technique that uses hypnosis to recover what practitioners believe are memories of past lives or incarnations, though others regard them as fantasies or delusions or a type of confabulation.

4 0

3 years ago

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