How can I solve this ?? dentify the electrolyte solution with the largest concentration of ions. A. 1.0 moles KOH in 2.0 L water B. 1.0 moles AlCl3 in 2.0 L water C. 1.3 moles MgCl2 in 3.0 L water D. 1.5 moles NaCl in 4.0 L water

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Answer 1 · 2018-01-01T17:26:14

Ionic compounds will generally dissociate into ions in solution. For the purposes of this problem, let's assume there isn't much ion pairing.

The key here is knowing we're worried about the concentration of ions, not the concentration of the compounds themselves. Hence, in turn,

#"A"#: #(1"mol" * (2"ions")/(KOH))/(2.0L) approx 1.0M#

#"B"#: #(1"mol" * (3"ions")/(AlCl_3))/(2.0L) approx 1.5M#

#"C"#: #(1.3"mol" * (3"ions")/(MgCl_2))/(3.0L) approx 1.3M#

#"D"#: #(1.5"mol" * (2"ions")/(NaCl))/(4.0L) approx 0.75M#

#"B"# is probably the answer after the preceding rough approximations above.