In: Chemistry
12. Which of the following salts is classified as a "strong acid-strong base salt"?
a) NH4CN
b) Li2C2H3O2
c) Li3PO4
d) Na2CO3
e) LiI
Strong acid: Acid which dissociates completly in a solution are strong acids. Similarly, bases which dissociates completly in a solution are strong bases.
a) NH4CN NH3 + HCN
Thus base in this reaction is NH3 which is weak base. Hence, NH4CN is not "strong acid-strong base salt".
b) LiC2H3O2 2Li+ + ACO-
Thus the given salt formed is from weak acid so it is not "strong acid-strong base salt".
Note: I think molecular formula is LiC2H3O2 and not Li2C2H3O2
c) Li3PO4 PO4-3 + 3Li+
Thus the given salt formed is from weak acid so it is not "strong acid-strong base salt".
d) Na2CO3 2Na+ + CO3--
Thus the given salt formed is from weak acid so it is not "strong acid-strong base salt".
e) LiI Li+ + I-
Thus the given salt is formed from strong acid HI and strong base LiOH. Thus this is the salt of "strong acid-strong base salt".
Answer is option e) LiI.