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In a procedure developed to determine the percent zinc in post 1982 pennies, 50 mL of...

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Chemistry

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.

Answer & Explanation Solved by verified expert
3.9 Ratings (528 Votes)
Solution mass of penny is 2500 g from 1982 to present the composition of the penny is 975 Zn and 25 Cu Therefore the mass of the Zn in the penny 2500 g 975 100 24375 g now lets calculate the moles of Zn moles of Zn mass molar    See Answer
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