In a procedure developed to determine the percent zinc in post1982 pennies, 50 mL of an HCl solution was used to react (dissolve)all of the zinc in the penny. To ensure complete reaction, thesolution contains twice as many moles of HCl that is usuallyneeded. What concentration of HCl should be used? What is theamount in moles of excess (unreacted) HCl in solution? How manymoles of NaOH would be needed to completely react with all of theexcess HCl?
To determine the percent zinc in the penny, the excess wastitrated with NaOH. determine the concentration of NaOH needed ifyou want to use approx 25 mL of NaOH to titrte the excess HCl.
