chad's quiz question help

[oms47]

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Hey,

I'm having difficulty understanding the following question from Chad's quizzes....

An aqueous solution of which of the following salts will have a pH closest to 7?

a. NaHCO3
b. CaCl2
c. KClO2
d. Al(NO3)3

the answer is b...but why and how would you figure such a question out.

thanks

 

[hurley]

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