Answer to Question #62169 in General Chemistry for Kenya

Question

outline a laboratory method to prove whether or not an old silver dollar is really made out of silver

Answer 1

1. First you dissolve the sample with silver in nitric acid 1.0m.
2. Next, using 0.1M sodium hydroxide solution adjusted to pH 7 neutral medium.
3. Next, add on sodium bromide, or sodium. The resulting yellow precipitate, silver bromide!

NaBr + AgNO3 = AgBr + NaNO3

4. The precipitate can be weighed and identified quantitative silver content