Questions 22-24 refer to the following information. A group of students was asked to recover Cu(s) f — Stoichiometry Chemistry Question
Question
Questions 22-24 refer to the following information.
A group of students was asked to recover Cu(s) from a blue-green aqueous solution containing an unknown concentration of Cu2+(aq). The students took a 100.0 mL sample of the solution and added an excess of 1.0 M Na3PO4(aq), causing the Cu2+(aq) to precipitate as Cu3(PO4)2(s), as shown in step 1 below.
Step 1: [VISUAL]
The Cu3(PO4)2(s) was filtered, dried, and weighed. Then the Cu3(PO4)2(s) was dissolved in a 3.0 M HCl(aq) solution, as shown in step 2 below.
Step 2: [VISUAL]
The students added a strip of Zn(s) to the solution to recover the Cu(s) as shown in step 3 below.
Step 3: [VISUAL]
Finally, the Cu(s) was filtered, dried, and weighed.
- If 3.8 g of Cu3(PO4)2(s) was recovered from step 1, what was the approximate [Cu2+] in the original solution? (The molar mass of Cu3(PO4)2 is 381 g/mol.)
A.
0.10 M
B.✓ Correct
0.30 M
C.
1.0 M
D.
3.0 M
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