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3 years ago

An acid has an acid dissociation constant of 2.8 10–9. What is the base dissociation constant of its conjugate base?

Chemistry

2 answers:

Neporo4naja [7]3 years ago

6 0

The answer is 3.6 x 10^-6

Liono4ka [1.6K]3 years ago

6 0

Answer: The base dissociation constant for a conjugate base is $3.5\times 10^{-6}$

Explanation:

To calculate the base dissociation constant for the given acid dissociation constant, we use the equation:

$K_w=K_b\times K_a$

where,

$K_w$ = Ionic product of water = $10^{-14}$

$K_a$ = Acid dissociation constant = $2.8\times 10^{-9}$

$K_b$ Base dissociation constant = ?

Putting values in above equation, we get:

$10^{-14}=2.8\times 10^{-9}\times K_b\\\\K_b=0.35\times 10^{-5}=3.5\times 10^{-6}$

Hence, the base dissociation constant for a conjugate base is $3.5\times 10^{-6}$

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If you change number of neutrons in an atom, you will also change its-

ikadub [295]

Answer:

atomic mass. You will have created an isotope.

Explanation:

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3 years ago

What mass of aluminum is needed to produce 0.500 mole of aluminum chloride?

3241004551 [841]

Answer: " 13.5 g Al " ;

→ that is: "13.5 grams of aluminum."

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Explanation:

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Note: What is missing from the question is the "balanced chemical equation" for the "chemical reaction" that contains:

The reactants: "aluminum (Al) " ; and "chlorine (Cl) " ; and:

The product: "aluminum choloride (AlCl₃) " .

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The "balanced chemical equation" is:

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2 Al + 3 Cl₂ → 2 AlCl₃ ;

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Note: The molecular weight of "aluminum (Al)" is: " 26.98 g /mol " .

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So: We call solve using a technique known as: "dimensional analysis" :

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0.500 mol AlCl₃ * $(\frac{2mol Al}{2mol AlCl_{3} }) * (\frac{26.98g Al}{1 mol Al}) = ?$

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Note: The units of "mol AlCl₃" cancel out to "1' ; and:

The units of "mol Al" cancel out to "1" ; and we are left with:

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" $\frac{(0.500 * 2 * 26.98)}{2}$ g Al ["grams of aluminum"] ;

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Note: We can "cancel out the "2's" ; since "2/2 = 1 " ; and we have:

→ (0.500 * 26.98) g Al ;

= 13.49 g Al ;

→ Round to 3 (Three) significant figures;

→ Since: "0.500" has 3 (Three) significant figures:

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= 13.5 g Al ; that is: "13.5 grams of aluminum."

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Hope this is helpful!

Best wishes to you in your academic pursuits—and within the "Brainly" community!

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3 0

3 years ago

As you go down a family or group on the periodic table *

pickupchik [31]

Answer:

The elements become less reactive.

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction and reactivity increases because of greater electron affinity.

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased. The electron affinity decreases because of shielding effect and thus atom become less reactive.

7 0

3 years ago

Consider the following chemical reaction:

jolli1 [7]

From the calculation, the moles of water produced is 18 moles of water.

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A decomposition reaction is one in which a substance is split up into smaller parts.

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From this reaction;

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Hence, 12 moles of chromium (III) hydroxide produces 18 moles of water.

Learn more about decomposition reaction:brainly.com/question/8009068?

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2 years ago

Why is U-235 the most common nuclear fuel instead of the more abundant U-238? State a clear topic sentence and support it with e

GREYUIT [131]

<h3>Answer and explanation;</h3>

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In a nuclear power station fissioning of uranium atoms replaces the burning of coal or gas. Heat created by splitting the U-235 atoms is then used to make steam which spins a turbine to drive a generator, producing electricity.

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3 years ago