Question

A titration of 10.00ml of hypochlorous acid with 0.350M barium hydroxide was done in the lab. At endpoint, 12.6 mL of barium hydroxide was used. What is the concentration of the hypochlorous solution? final answer is 0.882 M

Answer 1

To find the concentration of the hypochlorous acid solution, we can use the equation:

Moles of Hypochlorous Acid = Moles of Barium Hydroxide

First, let's calculate the moles of Barium Hydroxide used:

Moles of Barium Hydroxide = Volume of Barium Hydroxide (in liters) x Concentration of Barium Hydroxide

Volume of Barium Hydroxide (in liters) = 12.6 mL = 12.6 / 1000 = 0.0126 L

Moles of Barium Hydroxide = 0.0126 L x 0.350 M = 0.00441 moles

Since the reaction is 1:1, the moles of Hypochlorous Acid will be the same:

Moles of Hypochlorous Acid = 0.00441 moles

Now, let's calculate the concentration of the Hypochlorous Acid solution:

Concentration of Hypochlorous Acid = Moles of Hypochlorous Acid / Volume of Hypochlorous Acid (in liters)

Volume of Hypochlorous Acid (in liters) = 10.00 mL = 10.00 / 1000 = 0.0100 L

Concentration of Hypochlorous Acid = 0.00441 moles / 0.0100 L = 0.441 M

Therefore, the concentration of the hypochlorous acid solution is 0.441 M, rounded to three significant figures.