Posted by Anonymous on .
Which 0.10M solution below has the lowest pH?
a) NaCl b) KCN c) LiF d) RbClO e) all have the same pH
a. neither Na^+ nor Cl^- are hydrolyzed; therefore, the pH is just that of pure H2O which is pH = 7.
b. KCN the CN^- is hydrolyzed.
CN^- + HOH ==> HCN + OH^- so you know it will be basic. You can calculate the actual pH but that isn't necessary.
c. LiF the F^- is hydrolyzed.
F^- + HOH ==> HF + OH^- so you know this will be basic. It isn't necessary to calculate pH but you could do so.
d. RbClO. ClO^- is hydrolyzed.
ClO^- + HOH ==> HClO + OH^- and this one will be basic. You can calculate pH of this solution, also, but it isn't necessary.
So which has the lowest pH (the most acidic--least basic)?