Question

Titration of 20.0 mL of an NaOH solution required 9.0 mL of a 0.30 M KNO3 solution. What is the morality of the NaOH solution?

Answer 1

To find the molarity (M) of NaOH solution, we can use the following formula:

M(NaOH) × volume(NaOH) = M(KNO3) × volume(KNO3)

where:

M(NaOH) = molarity of NaOH solution (what we are trying to find)
volume(NaOH) = volume of NaOH solution used in the titration = 20.0 mL = 0.0200 L
M(KNO3) = molarity of KNO3 solution = 0.30 M
volume(KNO3) = volume of KNO3 solution used in the titration = 9.0 mL = 0.0090 L

Substituting the values into the formula, we get:

M(NaOH) × 0.0200 L = 0.30 M × 0.0090 L

Solving for M(NaOH), we get:

M(NaOH) = (0.30 M × 0.0090 L) / 0.0200 L

M(NaOH) = 0.135 M

Therefore, the molarity of the NaOH solution is 0.135 M.