What is the total concentration of all ions (the sum of theirindividual concentr

Question

What is the total concentration of all ions (the sum of theirindividual concentrations) in aqueous solutions of the following?

• Hint: Each substance is an electrolyte that dissociates inwater to produce ions. Use the link table of polyatomic ions or Table 4.1 on page 76of your textbook if you do not recognize the polyatomic ion. Forexample, Na2SO4 -> 2Na1+ +SO42- when it dissolves, so a 1 M soln ofNa2SO4 is 2M in Na1+ and 1M inSO42- and the total concentration of ions is2 M + 1 M = 3M.

0.0840-M CaCl2 1 M 0.0840-M Na3PO4 2 M 0.0320-M K2Cr2O7 3 M

0.0840-M CaCl2 1 M 0.0840-M Na3PO4 2 M 0.0320-M K2Cr2O7 3 M

Explanation / Answer

0.0840M CaCl2 ..........>(1*0.0840)Ca2+ + (2*0.0840)Cl- so total moles of ions = 1*0.0840+2*0.0840 = 0.252mol 0.0840M Na3PO4 ..........>(3*0.0840)Na+ +(1*0.0840)PO4-3 so total moles of ions = 3*0.0840 + 1*0.0840 = 0.336moles 0.0320M K2Cr2O7..........> (2*0.0320)K+ +(1*0.0320)Cr2O72- so total moles of ions = 2*0.0320 + 1*0.0320 = 0.096moles so total moles of ions = 2*0.0320 + 1*0.0320 = 0.096moles

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