All categories

3 years ago

What is the volume of 5.5 M HCl solution if it is neutralized in a titration by 85.0 mL of 1.22 M Mg(OH)2?

Chemistry

1 answer:

Korvikt [17]3 years ago

4 0

Answer:

0.38dm³ or 38mL

Explanation:

Given parameters:

molarity of HCl = 5.5M

volume of Mg(OH)₂ = 85mL

molarity of Mg(OH)₂ = 1.22M

Unknown:

Volume of HCl solution = ?

Solution:

we have to adopt the mole concept to solve this problem.

Complete reaction equation:

2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O

For a standard acid titrated against a standard base,

aA + bB → cC + dD

$\frac{number of moles of A}{number of moles of B} = \frac{a}{b}$

A is the acid, B is the base

since number of moles = C x V

C is the molarity

V is the volume

CₐVₐ / CₓVₓ = a / x

a = acid

x = base

85mL to dm³ = 0.085dm³

since the unknown is Vₐ,

let us make it the subject of the expression;

Vₐ = (a/x) x ( CₓVₓ/ Cₐ)

Va = $\frac{2}{1} x \frac{1.22 x 0.085}{5.5}$ = 0.38dm³

You might be interested in

An unknown salt is either NaF, NaCl, or NaOCl. When 0.050 mol of the salt is dissolved in water to form 0.500 L of solution, the

victus00 [196]

Answer: The unknown salt is NaF

Explanation:

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles of salt = 0.050 moles

Volume of solution = 0.500 L

Putting values in above equation, we get:

$\text{Molarity of salt}=\frac{0.050mol}{0.500L}\\\\\text{Molarity of salt}=0.1M$

To calculate the hydroxide ion concentration, we first calculate pOH of the solution, which is:

pH + pOH = 14

We are given:

pH = 8.08

$pOH=14-8.08=5.92$

To calculate pOH of the solution, we use the equation:

$pOH=-\log[OH^-]$

Putting values in above equation, we get:

$5.92=-\log[OH^-]$

$[OH^-]=10^{-5.92}=1.202\times 10^{-6}M$

The unknown salt given are formed by the combination of weak acid and strong acid which is NaOH

The chemical equation for the hydrolysis of $X^-$ ions follows:

$X^-(aq.)+H_2O(l)\rightleftharpoons HX(aq.)+OH^-(aq.);K_b$

Initial: 0.1

At eqllm: 0.1-x x x

Concentration of $OH^-=x=1.202\times 10^{-6}M$

The expression of $K_b$ for above equation follows:

$K_b=\frac{[OH^-][HX]}{[X^-]}$

Putting values in above expression, we get:

$K_b=\frac{(1.202\times 10^{-6})\times (1.202\times 10^{-6})}{(1-(1.202\times 10^{-6}))}\\\\K_b=1.445\times 10^{-11}M$

To calculate the acid dissociation constant for the given base dissociation constant, we use the equation:

$K_w=K_b\times K_a$

where,

$K_w$ = Ionic product of water = $10^{-14}$

$K_a$ = Acid dissociation constant

$K_b$ = Base dissociation constant = $1.445\times 10^{-11}$

Putting values in above equation, we get:

$10^{-14}=1.445\times 10^{-11}\times K_a\\\\K_a=\frac{10^{-14}}{1.445\times 10^{-11}}=6.92\times 10^{-4}$

We know that:

$K_a\text{ for HF}=6.8\times 10^{-6}$

$K_a\text{ for HCl}=1.3\times 10^{6}$

$K_a\text{ for HClO}=3.0\times 10^{-8}$

So, the calculated $K_a$ is approximately equal to the $K_a$ of HF

Hence, the unknown salt is NaF

6 0

3 years ago

Does anyone know this

LekaFEV [45]

Answer:

Your answer would be (D

Have a nice day

( • ω • )

3 0

3 years ago

Read 2 more answers

What is bias?

Maru [420]

Answer:

Explanation:

bias is when you want something to be true so you might ignore evidence to make your conclusion what you want it to be.

4 0

2 years ago

For the following questions, use a periodic table and your atomic calculations to find the unknown information about each isotop

mafiozo [28]

Answer:

Option B is correct.

Explanation:

We know that an atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example, if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.

In given problem we are given with 2 neutrons of helium. We know that the atomic number of He is 2. Thus Mass number of He is,

Number of neutrons + number of proton

2 + 2 = 4

Thus, option B is correct.

7 0

3 years ago

Lightning is an example of

Vikentia [17]

Answer:

yes great job you do know that you can make high voltage capacitors to store static electricity just look up ElectroBooms high voltage capacitor he made it's very useful if you want to learn more.

6 0

3 years ago