In: Chemistry
What is the molarity of Mg(NO3)2 in a solution resulting from mixing 150 mL of 0.020 M HNO3 with 150 mL of 0.010 M Mg(OH)2?
HNO3 millimoles = 150 x 0.020 = 3
Mg(OH)2 millimoles = 150 x 0.01 = 1.5
2HNO3 + Mg (OH)2 ----------------------------> Mg(NO3)2 + 2H2O
3 1.5 0 0 -----------------------> initial
0 0 3 3 ----------------------> after reaction
millimoles of Mg(NO3)2 = 3
molarity of Mg(NO3)2 = 3 / total volume
= 3 / (150+150)
= 3 /300
= 1/100
= 0.01 M
Mg(NO3)2 molarity = 0.01 M