Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 4 - Reactions in Aqueous Solution - Exercises: 4.8

Answer

See work below.

Work Step by Step

Put a small amount of each metal powder in three separate test tubes. Add 1 M HNO$_3$ solution (1 mL at a time) until two of the metals have completely dissolved. HNO$_3$ will dissolve both Zn and Pb, but will not dissolve Pt. To the two test tubes containing dissolved metal, add a few mL of 1 M Ni(NO$_3$)$_2$ solution. Zn is more reactive than Ni and will replace it in the compound Ni(NO$_3$)$_2$, forming black Ni metal which should be clearly visible. Pb is less reactive than Ni so it will not react with Ni(NO$_3$)$_2$.
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