Question: please help! 5. A unknown solution had a concentration of copper designated at Cou. A standard solution of copper had a concentration of 61.55ppm. Write

please help!

5. A unknown solution had a concentration of copper designated at Cou. A standard solution of copper had a concentration of 61.55ppm. Write an expression for the concentration of copper ([Cu]=) in a solution where 25.00mL of unknown solution was mixed with 3.00mL of copper standard

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