Chemistry, 14.07.2019 22:00 yolomcswaggin20

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?

Answers: 1

Show answers

Answers

Answer from: amyeileen

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.

Answer from: mrstealyogirl40

The molarity of the HBr solution is $\boxed{{\text{0}}{\text{.239 M}}}$ .

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:

${{\text{M}}_{\text{1}}}{{\text{V}}_{\text{1}}} = {{\text{M}}_{\text{2}}}{{\text{V}}_{\text{2}}}$

Here,

${{\text{M}}_{\text{1}}}$ is the molarity of the first solution.

${{\text{V}}_{\text{1}}}$ is the volume of the first solution.

${{\text{M}}_{\text{2}}}$ is the molarity of the second solution.

${{\text{V}}_{_{\text{2}}}}$ is the volume of the second solution .

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

${{\text{M}}_{{\text{HBr}}}}{{\text{V}}_{{\text{HBr}}}} = {{\text{M}}_{{\text{LiOH}}}}{{\text{V}}_{{\text{LiOH}}}}$ ......(1)

Here,

${{\text{M}}_{{\text{HBr}}}}$ is the molarity of the HBr solution.

${{\text{V}}_{{\text{HBr}}}}$ is the volume of the HBr solution.

${{\text{M}}_{{\text{LiOH}}}}$ is the molarity of the LiOH solution.

${{\text{V}}_{{\text{LiOH}}}}$ is the volume of the LiOH solution.

Rearrange equation (1) to calculate ${{\text{M}}_{{\text{HBr}}}}$ .

${{\text{M}}_{{\text{HBr}}}}=\dfrac{{{{\text{M}}_{{\text{LiOH}}}}{{\text{V}}_{{\text{LiOH}}}}}}{{{{\text{V}}_{{\text{HBr}}}}}}$ ......(2)

The value of ${{\text{V}}_{{\text{HBr}}}}$ is 25 mL.

The value of ${{\text{M}}_{{\text{LiOH}}}}$ is 0.205 M.

The value of ${{\text{V}}_{{\text{LiOH}}}}$ is 29.15 mL.

Substitute these values in equation (2).

$\begin{aligned}{{\text{M}}_{{\text{HBr}}}} &= \frac{{\left({{\text{0}}{\text{.205 M}}}\right) \times\left( {{\text{29}}{\text{.5 mL}}} \right)}}{{\left( {{\text{25 mL}}} \right)}}\\&= 0.23903{\text{ M}}\\&\approx {\text{0}}{\text{.239 M}}\\\end{aligned}$

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.

Answer from: Quest

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.

Answer from: Quest

the increase of protons hope this

Another question on Chemistry

Chemistry, 21.06.2019 14:00

05.06 percent yield lab report answers

Answers: 3

Answer

Chemistry, 22.06.2019 05:20

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Answers: 1

Answer

Chemistry, 22.06.2019 06:40

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Answers: 3

Answer

Chemistry, 22.06.2019 12:30

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

Answers: 1

Answer

You know the right answer?

25.0 ml of an hbr solution were titrated with 29.15 ml of a 0.205 m lioh solution to reach the equiv...

Questions