If 500 mL of HCl gas at 300 K and 100 kPa dissolved in pure water requires 12.50 mL of the NaOH solution to neutralize in a titration experiment, what is the concentration of the NaOH solution?
The concentration of the NaOH solution is 1.60 mol/L.
- Write the balanced chemical equation for the reaction.
- Use the Ideal Gas Law to convert litres of HCl to moles of HCl.
- The central part of the problem is to get the molar ratio between HCl and NaOH. This gives you the moles of NaOH.
- Use the volume of the NaOH to convert moles of NaOH to molarity of NaOH.
HCl + NaOH → NaCl + H₂O
Calculate Moles of HCl
Calculate Moles of NaOH
0.0200 mol HCl ×
Calculate Molarity of NaOH