Concentration Calculation of H₂SO₄

Reaction Overview

  • The reaction involves the neutralization of sulfuric acid (H₂SO₄) with sodium hydroxide (NaOH).
Chemical Equation
  • The balanced equation for the reaction is:
    2NaOH+H<em>2SO</em>4→Na<em>2SO</em>4+2H2O2 \text{NaOH} + \text{H}<em>2\text{SO}</em>4 \rightarrow \text{Na}<em>2\text{SO}</em>4 + 2 \text{H}_2\text{O}

Steps to Calculate Concentration of H₂SO₄

  1. Calculate the number of moles of NaOH used.

    • Formula: moles=concentration×volume\text{moles} = \text{concentration} \times \text{volume}
    • For NaOH:
      • Concentration = 0.100 mol/dm³
      • Volume (in dm³) = 20.0 cm² = 0.020 dm³ (conversion from cm² to dm³)
    • Calculation:
      moles NaOH=0.100 mol/dm3×0.020 dm3=0.002 mol\text{moles NaOH} = 0.100 \text{ mol/dm}^3 \times 0.020 \text{ dm}^3 = 0.002 \text{ mol}

  2. Determine the number of moles of H₂SO₄ that react with the NaOH.

    • According to the reaction equation:
      • 2 moles of NaOH react with 1 mole of H₂SO₄.
    • Calculation:
      • Based on the moles of NaOH calculated:
        moles H<em>2SO</em>4=0.002 mol NaOH2=0.001 mol H<em>2SO</em>4\text{moles H}<em>2\text{SO}</em>4 = \frac{0.002 \text{ mol NaOH}}{2} = 0.001 \text{ mol H}<em>2\text{SO}</em>4

  3. Calculate the concentration of H₂SO₄.

    • Formula:
      concentration (mol/dm3)=moles of H<em>2SO</em>4volume in dm3\text{concentration} \text{ (mol/dm}^3) = \frac{\text{moles of H}<em>2\text{SO}</em>4}{\text{volume in dm}^3}
    • Volume of H₂SO₄ (using the same volume as NaOH): 0.020 dm³
    • Calculation:
      concentration of H<em>2SO</em>4=0.001 mol0.020 dm3=0.050 mol/dm3\text{concentration of H}<em>2\text{SO}</em>4 = \frac{0.001 \text{ mol}}{0.020 \text{ dm}^3} = 0.050 \text{ mol/dm}^3

Conclusion

  • The concentration of dilute sulfuric acid H₂SO₄ in the solution is:
    0.050 mol/dm30.050 \text{ mol/dm}^3

Observations in Neutralization Reactions

  • When conducting reactions involving acid-base neutralization (like this one), the following observations might include:
    • Effervescence (if a gas is released)
    • Rise in temperature (exothermic reaction)
    • Change in pH (can be measured with pH indicator)

Additional Content

K+ Ions
  • The mention of potassium hydrogen indicates the presence of K+ ions in the solution.
  • Commonly, these ions are related to the formation of salts in neutralization reactions, influencing the resulting solution's properties.