>Which of the following aqueous solutions would test closet to 7 on the pH scale?
$a) NaCl$, $b) Na_2CO_3$, $c) NaH_2PO_4$, $d) NaCN$
The Attempt at a Solution
I don't understand this. So I tried writing chemical equations like for a), NaCl + H20 --> NaOH + HCl, and so on. But for example, HCl (the product in the previous equation) is a strong acid, so I thought it'd have a low pH, but apparently a) is actually the answer, and I don't know how to get that.