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Calculate the pH and pOH of a solution with a hydrogen ion concentration of 3.4 x 10 M. Acid or Base?

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User Lamma
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2 Answers

3 votes
If the hydrogen ion concentration of a solution is 3.4 x 10^(-10) M, we can use the following formula to calculate the pH:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter.

Substituting the given value, we get:

pH = -log(3.4 x 10^(-10))

pH = 9.47

To find the pOH of the solution, we can use the fact that pH + pOH = 14 (for a neutral solution at 25°C). Rearranging this equation, we get:

pOH = 14 - pH

Substituting the pH value we just found, we get:

pOH = 14 - 9.47

pOH = 4.53

Since the pH of the solution is greater than 7, which is the pH of a neutral solution, it means that the solution is acidic. Therefore, we can conclude that the solution with a hydrogen ion concentration of 3.4 x 10^(-10) M is an acid.
answered
User RMcGuigan
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8.6k points
2 votes

Answer:

Acido

Step-by-step explanation:

Primero, debemos recordar que el pH y el pOH están relacionados a través de la siguiente ecuación:

pH + pOH = 14

Podemos usar esta ecuación para calcular el pOH de la solución:

pH + pOH = 14

pOH = 14 - pH

Luego, podemos utilizar la definición del pH como el logaritmo negativo de la concentración de iones de hidrógeno para encontrar el pH de la solución:

pH = -log[H+]

pH = -log(3,4 x 10^-4)

pH = 3,47

Podemos usar la ecuación del equilibrio iónico del agua para calcular la concentración de iones hidroxilo (OH-) en la solución:

Kw = [H+][OH-] = 1,0 x 10^-14

[OH-] = Kw / [H+]

[OH-] = (1,0 x 10^-14) / (3,4 x 10^-4)

[OH-] = 2,94 x 10^-11 M

Ahora podemos usar la definición del pOH como el logaritmo negativo de la concentración de iones hidroxilo para encontrar el pOH de la solución:

pOH = -log[OH-]

pOH = -log(2,94 x 10^-11)

pOH = 10,53

Como el pH es menor que 7, la solución es ácida.

answered
User AaronLS
by
8.0k points

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