25.0 ml of an hbr solution were titrated with 29.15 ml of a 0.205 m lioh solution to reach the equivalence point. what is the molarity of the hbr solution?

HBr reacts with LiOH and forms LiBr and H₂O as the products. The balanced reaction is

LiOH(aq) + HBr(aq) → LiBr(aq) + H₂O(l)

Molarity (M) = moles of solute (mol) / volume of the solution (L)

Molarity of LiOH = 0.205 M

Volume of LiOH = 29.15 mL = 29.15 x 10⁻³ L

Hence,

moles of LiOH = molarity x volume of the solution

= 0.205 M x 29.15 x 10⁻³ L

= 5.97575 x 10⁻³ mol

The stoichiometric ratio between LiOH and HBr is 1 : 1.

Hence,

moles of HBr in 25.0 mL = moles of LiOH added

= 5.97575 x 10⁻³ mol

Hence, molarity of HBr = 5.97575 x 10⁻³ mol / 25.00 x 10⁻³ L

= 0.23903 M

≈ 0.239 M

Hence, the molarity of the HBr is 0.239 M.

The molarity of the HBr solution is .

Further Explanation:

The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:

1. Molarity (M)

2. Molality (m)

3. Mole fraction (X)

4. Parts per million (ppm)

5. Mass percent ((w/w) %)

6. Volume percent ((v/v) %)

Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.

The molarity equation is given by the following expression:

Here,

 is the molarity of the first solution.

is the volume of the first solution.

is the molarity of the second solution.

is the volume of the second solution .

In the concerned question, HBr is titrated with LiOH. So molarity equation becomes,

      ......(1)

Here,

 is the molarity of the HBr solution.

is the volume of the HBr solution.

is the molarity of the LiOH solution.

is the volume of the LiOH solution.

Rearrange equation (1) to calculate .

    ......(2)

The value of is 25 mL.

The value of is 0.205 M.

The value of is 29.15 mL.

Substitute these values in equation (2).

Hence the molarity of the HBr solution is 0.239 M.

Learn more:

1. What is the mass of 1 mole of viruses:

2. Determine the moles of water produced:

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: molarity, HBr, LiOH, 0.239 M, molarity equation, volume, M1, M2, V1, V2, 25 mL, 29.5 mL, 0.205 M, concentration, concentration terms.

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