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3 years ago

-QUESTION 6-PART 2-

Chemistry

2 answers:

ipn [44]3 years ago

7 0

Answer:

Explanation:

Basile [38]3 years ago

7 0

Answer to this question is B

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You need to prepare 100.0 mL of a pH 4.00 buffer solution using 0.100 M benzoic acid (p K a = 4.20 ) (pKa=4.20) and 0.140 M 0.14

Marina CMI [18]

Answer:

68.9mL of benzoic acid

31.1mL of sodium benzoate

Explanation:

Using Henderson-Hasselbalch formula:

pH = pka + log [Benzoate] / [Benzoic acid]

Where [Benzoate], [Benzoic acid] could be seen as moles of each compound.

4.00 = 4.20 + log [Benzoate] / [Benzoic acid]

0.631 = [Benzoate] / [Benzoic acid]

0.631 [Benzoic acid] = [Benzoate] (1)

0.1000L = [Benzoic acid] / 0.100M + [Benzoate] / 0.140M (2)

Replacing (1) in (2):

0.1000L = [Benzoic acid] / 0.100M + 0.631 [Benzoic acid] / 0.140M

0.1000L = 14.5 [Benzoic acid]

6.893x10⁻³ = Moles of benzoic acid

Replacing this value in (1):

4.350x10⁻³ = Moles of sodium benzoate

Converting these moles in volume using molar concentration:

6.893x10⁻³mol ₓ (1L /0.1mol ) = 0.0689L ≡ 68.9mL of benzoic acid.

4.350x10⁻³mol ₓ (1L /0.14mol ) = 0.0311L ≡ 31.1mL of sodium benzoate.

I hope it helps!

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4 years ago

How could two species that evolved on separate continents have many similarities? Read More >>

Neko [114]

They could have similar environments which require them to adapt similar characteristics

for example the dolphin and shark are not related but due to their aquatic environment they have similarly shaped tails and fins

the process or species getting more similar over time is called called convergent evolution

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3 years ago

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What unusual pattern occurs during El Niño

xxTIMURxx [149]

Explanation:

During this time, unusual winds cause warm surface water from the equator to move east, toward Central and South America. El Niño can

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3 years ago

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Some scientists believe that comets originate from the...

deff fn [24]

Answer:

Scientists believe that comets are the debris left from the solar nebula which condensed to form the Sun and planets in our solar system. Most comets are thought to originate in a huge cloud called the Oort Cloud. ... Comets follow a regular orbit around the Sun.

Hope this helps! :)

Explanation:

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4 years ago

Lauryl alcohol is obtained from cocon ut oil and is used to make detergents. A solution of 5.00 g of lauryl alcohol in 0.100 kg

Len [333]

Answer:

185.2 g/mol.

Explanation:

Solvent = Benzene

Solute = lauryl alcohol

Given:

Mass of solute = 5 g

Mass of solvent = 0.1 kg

Freezing point of solvent, Temp.f = 4.1 °C

Initial freezing point of solvent, Temp.i = 5.5 °C

Molal freezing depression constant for Benzene, kf = 5.12 °C/m

ΔTemp.f = Temp.f - Temp.i

= 5.5 - 4.1

= 1.4 °C

ΔTemp.f = kf * m

Where m = molality

m = 1.4/5.12

= 0.27 mol/kg

Molality = number of moles of solute/mass of solvent

Number of moles = 0.27/0.1

= 0.027 mol.

Molar mass = mass/number of moles

= 5/0.027

= 185.2 g/mol.

3 0

3 years ago