Answer:
0.363 M
Explanation:
The equation used to find the molarity is:
Molarity (M or moles/L) = moles / volume (L)
You have not been given values that can be directly substituted into the equation. However, these values can be converted to fit the equation. To find the molarity of the solution, you need to (1) convert grams NaOH to moles (via molar mass from periodic table), then (2) convert mL to L (by dividing by 1,000), and then (3) calculate the molarity (using the molarity formula).
Step 1:
Molar Mass (NaOH): 22.990 g/mol + 15.998 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.996 g/mol
10 g NaOH 1 mole
---------------- x ------------------- = 0.2500 moles NaOH
39.996 g
Step 2:
689 mL / 1,000 = 0.689 L
Step 3:
Molarity = moles / volume
Molarity = 0.2500 moles / 0.689 L
Molarity = 0.363 moles/L
