15 ml of 0.0456 g/L Cu2+ was mixed with 65 ml of water. What is the molarity of Cu2+?
Find first the molecular weight of Cu2+ then multiply it with 0.0456g/L...1 mole of Cu2+ = MW of Cu2+
0.0456 g/L * 15 mL * 1 L / 1000 mL = 0.000684 g Cu2+
0.000684 g / (127.092 g/mol) /.080 L = .00006.73 mol/L
0.0000673 M Cu2+
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