A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL. What is the nitrate ion concentration in the resulting solution?

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**Problem Statement**

A 50.0 mL sample of 0.436 M NH₄NO₃ is diluted with water to a total volume of 250.0 mL. What is the nitrate ion concentration in the resulting solution?

**Solution**

To find the nitrate ion concentration in the resulting diluted solution, you need to use the concept of dilution.

First, calculate the moles of NH₄NO₃ in the 50.0 mL sample:
\[ \text{Moles of NH₄NO₃} = \text{Concentration (M)} \times \text{Volume (L)} \]
\[ \text{Moles of NH₄NO₃} = 0.436 \, \text{M} \times \frac{50.0 \, \text{mL}}{1000 \, \text{mL/L}} \]
\[ \text{Moles of NH₄NO₃} = 0.0218 \, \text{moles} \]

Since NH₄NO₃ dissociates completely in water:
\[ \text{NH₄NO₃} \rightarrow \text{NH₄}^+ + \text{NO₃}^- \]

Each mole of NH₄NO₃ produces one mole of NO₃⁻ (nitrate ion).

Therefore, there are 0.0218 moles of NO₃⁻ in the diluted solution.

Next, calculate the concentration of NO₃⁻ in the total volume of the diluted solution (250.0 mL):
\[ \text{Concentration (M)} = \frac{\text{Moles of solute}}{\text{Volume of solution (L)}} \]
\[ \text{Concentration (M)} = \frac{0.0218 \, \text{moles}}{0.250 \, \text{L}} \]
\[ \text{Concentration (M)} = 0.0872 \, \text{M} \]

Thus, the nitrate ion concentration in the resulting solution is 0.0872 M.
Transcribed Image Text:**Problem Statement** A 50.0 mL sample of 0.436 M NH₄NO₃ is diluted with water to a total volume of 250.0 mL. What is the nitrate ion concentration in the resulting solution? **Solution** To find the nitrate ion concentration in the resulting diluted solution, you need to use the concept of dilution. First, calculate the moles of NH₄NO₃ in the 50.0 mL sample: \[ \text{Moles of NH₄NO₃} = \text{Concentration (M)} \times \text{Volume (L)} \] \[ \text{Moles of NH₄NO₃} = 0.436 \, \text{M} \times \frac{50.0 \, \text{mL}}{1000 \, \text{mL/L}} \] \[ \text{Moles of NH₄NO₃} = 0.0218 \, \text{moles} \] Since NH₄NO₃ dissociates completely in water: \[ \text{NH₄NO₃} \rightarrow \text{NH₄}^+ + \text{NO₃}^- \] Each mole of NH₄NO₃ produces one mole of NO₃⁻ (nitrate ion). Therefore, there are 0.0218 moles of NO₃⁻ in the diluted solution. Next, calculate the concentration of NO₃⁻ in the total volume of the diluted solution (250.0 mL): \[ \text{Concentration (M)} = \frac{\text{Moles of solute}}{\text{Volume of solution (L)}} \] \[ \text{Concentration (M)} = \frac{0.0218 \, \text{moles}}{0.250 \, \text{L}} \] \[ \text{Concentration (M)} = 0.0872 \, \text{M} \] Thus, the nitrate ion concentration in the resulting solution is 0.0872 M.
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