Question

What is the concentration of an HCl solution if 25.00 mL of the solution requires 35.80 mL of 0.100 M NaOH to reach the endpoint during titration?

Answer 1

To find the concentration of the HCl solution, we can use the concept of titration and the reaction between HCl and NaOH. The balanced chemical equation for the reaction between HCl and NaOH is:HCl  aq  + NaOH  aq   NaCl  aq  + H2O  l From the balanced equation, we can see that the mole ratio between HCl and NaOH is 1:1. Now, we can use the information given to find the moles of NaOH and then use the mole ratio to find the moles of HCl. Moles of NaOH = Molarity  VolumeMoles of NaOH = 0.100 M  35.80 mL   1 L / 1000 mL  = 0.00358 molesSince the mole ratio between HCl and NaOH is 1:1, the moles of HCl are equal to the moles of NaOH:Moles of HCl = 0.00358 molesNow, we can find the concentration of the HCl solution using the formula:Molarity = Moles / VolumeMolarity of HCl = 0.00358 moles /  25.00 mL   1 L / 1000 mL  Molarity of HCl = 0.00358 moles / 0.025 L = 0.1432 MTherefore, the concentration of the HCl solution is 0.1432 M.