Question

66.8 ml of a 0.235 M solution of Ca(NO)2 is mixed with 87.2 ml of a 0.450 M solution of KNO3. What is the nitrate ion concentration?
a) 0.235 M
b) 0.450 M
c) Calculations needed, answer not provided
d) 0.235 M + 0.450 M