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A scientist created a 450 mL of a 5M solution of LiF. If someone accidently added 800 mL of water to this solution then what was its new concentration? Question 6 options: 1.8 M 2.5 M 10 M 13.9 M 8.9 M 2.8 M

Question

A scientist created a 450 mL of a 5M solution of LiF. If someone accidently added 800 mL of water to this solution then what was its new concentration?

Question 6 options:

1.8 M

2.5 M

10 M

13.9 M

8.9 M

2.8 M

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Solution 1

Para resolver este problema, debemos usar el concepto de dilución, que se puede expresar con la fórmula:

C1V1=C2V2 C_1 V_1 = C_2 V_2

donde:

  • C1 C_1 es la concentración inicial de la solución.
  • V1 V_1 es el volumen inicial de la solución.
  • C2 C_2 es la concentración final de la solución.
  • V2 V_2 es el volumen final de la solución.

Primero, identifiquemos los valores dados:

  • C1=5 C_1 = 5 M
  • V1=450 V_1 = 450 mL
  • V2=V1+800 V_2 = V_1 + 800 mL = 450 mL + 800 mL = 1250 mL

Ahora, sustituimos estos valores en la fórmula para encontrar C2 C_2 :

5M×450mL=C2×1250mL 5 \, \text{M} \times 450 \, \text{mL} = C_2 \times 1250 \, \text{mL}

Resolviendo para C2 C_2 :

C2=5M×450mL1250mL C_2 = \frac{5 \, \text{M} \times 450 \, \text{mL}}{1250 \, \text{mL}}

C2=2250MmL1250mL C_2 = \frac{2250 \, \text{M} \cdot \text{mL}}{1250 \, \text{mL}}

C2=1.8M C_2 = 1.8 \, \text{M}

Por lo tanto, la nueva concentración de la solución es 1.8 M.

La opción correcta es:

  1. 1.8 M

This problem has been solved

Solution 2

Para resolver este problema, debemos usar el concepto de dilución, que se puede expresar con la fórmula:

C1V1=C2V2 C_1 V_1 = C_2 V_2

donde:

  • C1 C_1 es la concentración inicial de la solución.
  • V1 V_1 es el volumen inicial de la solución.
  • C2 C_2 es la concentración final de la solución.
  • V2 V_2 es el volumen final de la solución.

Primero, identifiquemos los valores dados:

  • C1=5 C_1 = 5 M
  • V1=450 V_1 = 450 mL
  • V2=V1+800 V_2 = V_1 + 800 mL = 450 mL + 800 mL = 1250 mL

Ahora, sustituimos estos valores en la fórmula para encontrar C2 C_2 :

5M×450mL=C2×1250mL 5 \, \text{M} \times 450 \, \text{mL} = C_2 \times 1250 \, \text{mL}

Resolviendo para C2 C_2 :

C2=5M×450mL1250mL C_2 = \frac{5 \, \text{M} \times 450 \, \text{mL}}{1250 \, \text{mL}}

C2=2250MmL1250mL C_2 = \frac{2250 \, \text{M} \cdot \text{mL}}{1250 \, \text{mL}}

C2=1.8M C_2 = 1.8 \, \text{M}

Por lo tanto, la nueva concentración de la solución es 1.8 M.

La opción correcta es:

  1. 1.8 M

This problem has been solved

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