The equation shows that 1 mol of HCl reacts with 1 mol of NaOH. So the amount of NaOH in 20.0 cm 3 is 0.025 mol. Substituting into the equation to find the concentration of NaOH: \(Concentration ...

Clean the pennies in concentrated HCl. Watch zinc filled pennies (after 1983) to make sure the HCl doesn’t get to the zinc and dissolve it. Stir NaOH/Zn mixture with a glass rod. Zn will clump up on ...