500 mL 0.4 M calcium nitrite contains ________ moles of calcium ions and ________ moles of nitrite ions.

Question

Quizplus · Accepted Answer

Calcium nitrite, Ca(NO2)2, dissociates into one Ca2+ ion and two NO2- ions in solution. Thus, in 0.4 M calcium nitrite:

- The concentration of Ca2+ ions is 0.4 M x 1 = 0.4 mol/L
- The concentration of NO2- ions is 0.4 M x 2 = 0.8 mol/L

Since we have 500 mL of the solution, we need to convert the concentrations to moles by multiplying by the volume in liters:

- Moles of Ca2+ ions = 0.4 mol/L x 0.5 L = 0.2 mol
- Moles of NO2- ions = 0.8 mol/L x 0.5 L = 0.4 mol

Therefore, there are 0.2 moles of calcium ions and 0.4 moles of nitrite ions in the solution. The correct answer is B.

500 ML 04 M Calcium Nitrite Contains ________ Moles of Calcium Ions