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4 years ago

Your answer would be A

Chemistry

1 answer:

Lena [83]4 years ago

8 0

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How many moles of solid NaF would have to be added to 1.0 L of 0.115 M HF solution to achieve a buffer of pH 3.46? Assume there

astra-53 [7]

Answer : The moles of solid NaF is, 1.09 mole.

Explanation : Given,

pH = 3.46

$K_a=7.2\times 10^{-4}$

Concentration of HF = 0.115 M

Volume of solution = 1.0 L

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (7.2\times 10^{-4})$

$pK_a=4-\log (7.2)$

$pK_a=3.14$

Now we have to calculate the moles of HF.

$\text{Moles of }HF=\text{Concentration of }HF\times \text{Volume of solution}$

$\text{Moles of }HF=0.115M\times 1.0L=0.115mol$

Now we have to calculate the moles of NaF.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{\text{Moles of NaF}}{\text{Moles of HF}}$

Now put all the given values in this expression, we get:

$3.46=3.14+\log (\frac{\text{Moles of NaF}}{0.115})$

$\text{Moles of NaF}=1.09mol$

Thus, the moles of solid NaF is, 1.09 mole.

7 0

3 years ago

Red paint mixed with blue paint becomes purple. What is the most likely cause of this color change?

melamori03 [73]

Answer:

I might be late but when red paint and blue paint mix to become purple. its a <u>physical change</u>, so its C

Explanation:

5 0

3 years ago

Give the characteristics of a strong acid.

Novosadov [1.4K]

The correct answer is d

4 0

3 years ago

A) ¿Cuáles son las partículas elementales que componen la materia, b) cuál es su ubicación, c) su carga eléctrica?

loris [4]

Las 3 partículas elementales son a) electrón, protón y neutrón. Se encuentran b) electrón en las órbitas electrónicas, el protón y el neutrón están en el núcleo. Sus cargas son c) electrón-negativo; protón-positivo; neutrón-sin carga. (Opción A).

Según el modelo atómico moderno, las partículas elementales que componen la materia son:

Electrón, se ubica en las órbitas electrónicas y tiene carga negativa.
Protón, se ubica en el núcleo y tiene carga positiva.
Neutrón, se ubica en el núcleo y no tiene carga

Las 3 partículas fundamentales son a) electrón, protón y neutrón. Se encuentran b) electrón en las órbitas electrónicas, el protón y el neutrón están en el núcleo. Sus cargas son c) electrón-negativo; protón-positivo; neutrón-sin carga. (Opción A).

Aprende mas: brainly.com/question/22693941

5 0

3 years ago

Which scenario describes an interaction between two of Earth's spheres?

quester [9]

The correct answer is D. Bears dig big holes in the ground to protect their young

Explanation:

The Earth spheres include the biosphere (life in the Earth), the hydrosphere (water bodies), the geosphere (rocks and other elements that compose land and soil), and the atmosphere (gases that compose the air). In this context, there is an interaction between two spheres: the biosphere and the geosphere, when a bear digs holes in the ground because a living organism that is part of the biosphere is modifying the structure and shape of superficial soil, which is part of the geosphere.

6 0

3 years ago

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