which of the following solutions will have the highest concentration of chloride ions?

NetherCraft 0

a) 0.10 M AlCl3

b) 0.05 M CaCl2

c) 0.10 M NaCl

d) 0.10 M MgCl2

If I’m doing it right it should be A? .30 M Cl- Right???

2 Answers

  • AlCl3 dissociates in water to form its ions. Thus,

    AlCl3 <–> Al^3+(aq) + 3Cl-(aq)

    Because you have a 1:3 mole ratio between AlCl3 and Cl-, the [Cl-] = 0.10M * 3 = 0.30M

    Thus, answer A is correct.

    [Cl-] for b) is 0.10M

    [Cl-] for c) is 0.10M

    [Cl-] for d) is 0.20M

    [Answer: good job!]

  • Yes…”a” is correct. The two things that need to be considered are molarity and number of ions in the formula.

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