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lapo4ka [179]
4 years ago
6

Which of the following is a characteristic property of ionic compounds? A.They have low melting points. B.They form hard, brittl

e crystals. C.They do not form crystals. D.They have low boiling points.
Chemistry
1 answer:
ziro4ka [17]4 years ago
6 0

Answer:

the answer is d

Explanation:

i just did it

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A buffer solution is composed of 7.50 mol of acid and 4.75 mol of the conjugate base. If the pKa of the acid is 4.90 , what is t
Mamont248 [21]

Answer:

The correct answer is: pH= 4.70

Explanation:

We use the <em>Henderson-Hasselbach equation</em> in order to calculate the pH of a buffer solution:

pH= pKa + log   \frac{ [conjugate base]}{[acid]}

Given:

pKa= 4.90

[conjugate base]= 4.75 mol

[acid]= 7.50 mol

We calculate pH as follows:

pH = 4.90 + log (4.75 mol/7.50 mol) = 4.90 + (-0.20) = 4.70

7 0
3 years ago
What is the final pH of a solution when 0.1 moles of acetic acid is added to water to a final volume of 1L?
kicyunya [14]

Answer:

The pH of solution is 2.88 .

Explanation:

The reaction is :

CH_3COOH-->CH_3COO^-+H^+

We know, K_a for this reaction is = 1.76\times 10^{-5}.

Also, since volume of water is 1 L.

Therefore, molarity of solution is equal to number of moles.

Also, K_a=\dfrac{[CH_3COO^-][H^+]}{[CH_3COOH]}

Let, amount of CH_3COO^- and\ H^+ produce is x.

So,

K_a=\dfrac{[x][x]}{[0.1]}\\1.76\times 10^{-5}=\dfrac{[x][x]}{[0.1]}

x=0.0013\ mol.

We know, pH=-log{x}=-log(0.0013)=2.88

Therefore, pH of solution is 2.88 .

Hence, this is the required solution.

5 0
3 years ago
Cuales son los nombres de la distribución de los electrones en un átomo ?
cluponka [151]
Un nombre es configuración de los electrones. Lo siento, no sé más nombres
7 0
3 years ago
Why does a higher temperature cause a reaction to go faster?
erastovalidia [21]
<span>Because it causes more collisions of molecules per second and collisions have higher energy because of higher temperature.  </span>

<span>
</span>
7 0
3 years ago
Read 2 more answers
Identify the acid, base, conjugate acid and conjugate base in the following reactions:
Leni [432]

Answer:

a. NH₃ : base

CH₃COOH (acetic acid) : acid

NH₄⁺ : conjugate acid

CH₃COO⁻ : conjugate base

b. HClO₄ (perchloric acid) : acid

NH₃ : base

ClO₄⁻ : conjugate base

NH₄⁺ : conjugate acid

Hope this helps.

4 0
3 years ago
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