Question

calculate the molar concentration of potassium ions if 1.37 g of potassium carbonate, is dissolved in enough water to make 235 mL of solution

Answer 1

Concentration of solution means Molarity

Molarity=moles of solute/vol of soln

Moles of k2co3=1.37/138=0.0099

Vol soon (L)=0.235

Molarity=0.0098/0.235=0.042

K2CO3----->2K+. CO32-

On dissociation we get 2 moles of K+ and 1 mole of CO32-

Hence the concentration of K+ in the solution

=2× M=2×0.042=0.084M

I hope this helps ( ╹▽╹ )