Question

A 50.0 mL sample of hydrobromic acid, HBr, is titrated to an end point with 20.0 mL of 1.50 NaOH. What is the concentration of HBr?

Answer 1

The answer to your question is 0.6 M

Step-by-step explanation:

Data

Volume of HBr = 50 ml

Volume of NaOH = 20 ml

[NaOH] = 1.5 M

[HBr] = ?

Process

1.- Calculate the moles of NaOH

Molarity = moles/volume

-Solve for moles

moles = Molarity x volume

-Substitution

moles = 1.5 x 0.02

-Result

moles = 0.03

2.- Write the balanced reaction

HBr + NaOH ⇒ NaBr + H₂O

3.- Calculate the moles of HBr

1 moles HBr ------------------ 1 moles NaOH

x moles HBr --------------- 0.03 moles of NaOH

x = (0.03 x 1) / 1

x = 0.03 moles of HBr

4.- Calculate the concentration of HBr.

Molarity = 0.03 / 0.05

Molarity = 0.6 M