Question

Samantha added 125 mL of water to 100mL of a stock solution to make 225 mL of a 0.75 M Solution.The Concentration of the original stock solution will be __ than that of the mixed solution.

A.Greater than

B.Less than

C.Equal to

Answer 1

Answer: A.Greater than

Step-by-step explanation:

According to the neutralization law,

`M_1V_1=M_2V_2`

where,

`M_1` = molarity of stock solution = ?

`V_1` = volume of stock solution = 100 ml

`M_2` = molarity of dilute solution = 0.75 M

`V_2` = volume of dilute solution = 225 ml

`M_1* 100=0.75* 225`

`M_1=1.7M`

Thus Concentration of the original stock solution will be greater than that of the mixed solution.