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 ...

When additional base is added, the precipitate dissolves. The reactions can then be reversed with the addition of hydrochloric acid. The precipitate will reappear and then redissolve. Turn on stir ...

Wash and dry the "gold" penny. 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 ...