Question

Which ONE of the following aqueous solutions will contain the highest total concentration of dissolved ions (assume 100% ionized and hydrated)?

(A) 0.5 M Aluminium nitrate

(B) 1.0 M Sodium iodide

(C) 1.5 M Sodium dihydrogen phosphate

(D) 2.0 M Hydrochloric acid

(E) 2.5 M Lithium bromide

Answer 1

(A) 0.5 M Aluminium nitrate ( NH4NO3)

0.5 M NH4NO3 ----> 1×(0.5 M NH4^+) + 1×(0.5 M NO3^-1)

= 0.5 M + 0.5 M

= 1.0 M

(B) 1.0 M Sodium iodide (NaI)

1.0 M NaI -----> 1×( 1 M Na+) + 1×(1M I-)

= 1M + 1M

= 2M

(C) 1.5 M Sodium dihydrogen phosphate NaH2PO4

1.5 M NaH2PO4 ------> 1×(1.5 M Na+) + 1×(1.5 M H2PO4^-)

= 1.5 M + 1.5 M

= 3.0 M

(D) 2.0 M Hydrochloric acid (HCl)

2.0 M HCl ----> 1×(2 M H+) + 1× (2M Cl-)

= 2M + 2M

= 4 M

(E) 2.5 M Lithium bromide (LiBr)

2.5 M LiBr -----> 1× (2.5 M Li+ ) + 1×(2.5 M Br-)

= 2.5 M + 2.5 M

= 5.0 M

Hence, aqueous solutions will contain the highest total concentration of dissolved ions is (E) 2.5 M lithium bromide