Question

Which of the following solutions has the greatest concentration of K+ ions?0.013M K3PO40.026M K2SO40.032M KNO30.014M KBr

Answer 1

The solution of 0.026 K2SO4 has the greatest concentration of K+.

Through the dissociation equation of each compound we can see that:

0.013M K3PO4

$K_3PO_4\text{ }\rightarrow3K^++PO^{-3}_4$

0.013M 3x(0.013)

So, the K+ concentration is 0.039M.

0.026M K2SO4

$K_2SO_4\text{ }\rightarrow2K^++SO^{-2}_4$

0.026 2x(0.026)

Here the K+ concentration is 0.052M.

0.032M KNO3

$\text{KNO}_3\text{ }\rightarrow K^++NO^-_3$

0.032 0.032

The concentration of K+ is 0.032M.

0.014M KBr

$\text{KBr }\rightarrow K^++Br^-$

0.014 0.014

Finally, here the K+ concentration is 0.014M.