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Practice

Now you should practice determining what species are actually present in solutions of the chemicals listed in exercise 14. In some cases you should be able to determine whether or not the chemical dissociates. For those, just the formula of the chemical is given. In other cases you are not expected to know whether or not the chemical dissociates. For those, you are also given whether the chemical is a strong electrolyte or a weak electrolyte or a nonelectrolyte. So take time to do that now and I'll help you check your answers when we continue with the lesson.

 

What chemical species actually exist in each of the following solutions?

HCl(aq) strong electrolyte
NaCl(aq)
BaCl2(aq)
HNO3(aq)  strong electrolyte
HF(aq) weak electrolyte
K2SO4(aq) strong electrolyte
Mg(NO3)2(aq)
KOH(aq)
CH3OH(aq) nonelectrolyte

 

Answers

HCl(aq) strong electrolyte H+(aq), Cl-(aq)
NaCl(aq) ionic, strong electrolyte Na+(aq), Cl-(aq)
BaCl2(aq) ionic, strong electrolyte Ba2+(aq), Cl-(aq)
HNO3(aq) strong electrolyte H+(aq), NO3-(aq)
HF(aq) weak electrolyte HF(aq),H+(aq), F-(aq)
K2SO4(aq) strong electrolyte K+(aq), SO42-(aq)
Mg(NO3)2(aq) ionic, strong electrolyte Mg2+(aq), NO3-(aq)
KOH(aq)   ionic, strong electrolyte K+(aq), OH-(aq)
CH3OH(aq)   nonelectrolyte CH3OH(aq)

 

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