20.0mL of 0.16 NaOH is used neutralize 25.0mL of an unknown concentration of HCl in a titration. what is the molar concentration of the HCI

The Concentration of HCl, a strong acid, is 0.5 mol/L. If 20 mL HCl is needed to titrate 40 mL of NaOH, what is the Concentration of NaOH?

2. What would be the molar concentration of a HCL solution if 25.0 mL of the solution is neutralized by 15.5 mL of 0.800 mol/L NaOH?

3. a) Explain what an equivalence point is in a titration.
b) What is the purpose of an indicator in the solution with the unknown concentration?

4. A strong acid and a weak acid that are both 1.0 mol/L react differently with zinc. Choose two acids and with the aid of equations and dissociation, explain why this is the case.

What is the molar concentration of the 23.64 mL of NaOH solution used to neutralize 0.147 g of oxalic acid dihydrate (H₂C₂O₄2H₂O, molar mass = 126.07 g/mol)?