J.R. S. answered 09/13/18
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Ph.D. in Biochemistry--University Professor--Chemistry Tutor
Final volume = 10 ml + 20 ml = 30 ml
Ni2+ comes only from NiSO4
Cu2+ comes only from CuSO4
SO42- comes from BOTH NiSO4 and CuSO4
Find moles of each ion as follows:
moles Ni2+ and SO42- from NiSO4 = 0.01 L x 0.2 moles/L = 0.002 moles Ni2+ and 0.002 moles SO42-
moles Cu2+ and SO42- from CuSO4 = 0.02 L x 0.1 moles/L = 0.002 moles Cu2+ and 0.002 moles SO42-
Total moles of SO42- = 0.002 + 0.002 = 0.004 moles SO42-
Molarity of each ion (to 1 significant figure):
Ni2+ = 0.002 moles/0.03 L = 0.0666 M = 0.07 M
Cu2+ = 0.002 moles/0.03 L = 0.0666 M = 0.07 M
SO42- = 0.004 moles SO42-/0.03 L = 0.133 M = 0.1 M