Question

In: Chemistry

A "silver" ring was purchased at a local store. It was stamped "sterling silver" which means...

A "silver" ring was purchased at a local store. It was stamped "sterling silver" which means that it must contain 92.5% by mass Ag. The remaining 7.5% may technically be any other metal. Copper is typically used for this. This ring was found to be magnetic, which suggests that the non silver part may contain iron or nickel as well. A small amount of the ring is dissolved in nitric acid, making a solution of the nitrate of any metal that would be present.

a. What group does each of the four metals belong to?

b. After the removal of the silver as the insoluble chloride, the solution is made basic with 6M NH4OH. If the solution turns Violet, with no blue color present, what cation was present in the solution?

c. What would the cation present be if the solution turned a very strong navy blue color instead, when the amonium hydroxide was added?

Solutions

Expert Solution

Q = mct
m = 75g
c= 1 cal/g-c0
t = 30C0

Q = 75 * 1 *30

Q = 2250 Calaries

7.A sterilig silver dish weight is 185

percentage of silver is dish = 92.5%

percentage of copper is dish = 7.5%

mass of silver in dish =185 *92.5/100
                                     =171.125g
mass of copper in dish = 185*7.5/100
                                        =13.875g

queen_honey_blossom answered 1 year ago
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