What is the molar concentration of na⁺(aq) in a solution that is prepared by mixing 10 ml of a 0.010 m nahco₃(aq) solution with 10 ml of a 0.010 m na₂co₃(aq) solution?
a. 0.010 mole/l
b. 0.015 mole/l
c. 0.020 mole/l
d. 0.030 mole/l

B. 0.015 mole/L

Explanation:

To calculate the number of moles for given molarity, we use the equation:

    .....(1)

Molarity of solution = 0.010 M

Volume of solution = 10 mL

Putting values in equation 1, we get:

a)

1 mole of contains = 1 mol of

Thus of contain= mol of

b)

1 mole of contains = 2 mol of

Thus of contain= mol of

Total

The molar concentration of in a solution is 0.015 M