Question

Hydrobromic acid solution of unknown concentration is titrated with a 0.500M LiOH solution.

Answer 1

Answer:

1.00 M

Explanation:

Step 1: Write the balanced equation

HBr + LiOH ⇒ LiBr + H₂O

Step 2: Calculate the reacting moles of lithium hydroxide

40.00 mL of 0.500 M solution react. The reacting moles of LiOH are:

$40.00 \times 10^{-3} L \times \frac{0.500mol}{L} = 0.0200 mol$

Step 3: Calculate the reacting moles of hydrobromic acid

The molar ratio of HBr to LiOH is 1:1. The reacting moles of hydrobromic acid are 1/1 × 0.0200 mol = 0.0200 mol.

Step 4: Calculate the molarity of hydrobromic acid

0.0200 moles of HBr are in 20.00 mL of the solution. The molarity of the hydrobromic acid solution is:

$M= \frac{0.0200 mol}{20.00 \times 10^{-3} L } =1.00 M$