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3 years ago

According to one acid-base theory, a water molecule acts as an acid when the water molecule

Chemistry

1 answer:

Snowcat [4.5K]3 years ago

6 0

According to one acid-base theory, a water molecule acts as an acid when the water molecule (3) donates an H+.

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Like all equilibrium constants, the value of Kw depends on temperature. At body temperature (37°C), Kw = 2.4 * 10-14. What are t

Aleksandr [31]

Answer:

pH = 6.8124

Explanation:

We know pH decreases with increase in temperature.

At room temperature i.e. 25⁰c pH of pure water is equal to 7

We know

Kw = [H⁺][OH⁻]...............(1)

where Kw = water dissociation constant

At equilibrium [H⁺] = [OH⁻]

So at 37⁰c i.e body temperature Kw = 2.4 × 10⁻¹⁴

From equation (1)

[H⁺]² = 2.4 × 10⁻¹⁴

[H⁺] = √2.4 × 10⁻¹⁴

[H⁺] = 1.54 × 10⁻⁷

pH = - log[H⁺]

= - log{1.54 × 10⁻⁷}

= 6.812

5 0

2 years ago

What size pipette accurately measures 0.8 ml of fluid? indicate the volume and accuracy of the pipette.

chubhunter [2.5K]

The pipette that accurately measures 0.8mL of fluid is P1000 micropipette.

It is given that:-

The volume of fluid = 0.8mL

We know that,

1 mL = 1000 microliter.

Hence,

0.8 mL = 0.8*1000 microliter = 800 microliter

We know that, a P1000 micropipette's volume ranges between 200 microliter to 1000 micro liter.

As,

200 < 800 < 100

Hence, P1000 micropipette is the right instrument.

The accuracy of this pipette decreases as volume decreases. Since the value 800 is near the maximum volume 1000 of the pipette, the accuracy of the pipette will be within a few percentages of the actual value.

To learn more about pipette, here:-

brainly.com/question/15343680

#SPJ4

4 0

1 year ago

Use the reaction and bond information to answer the question. H2 CO2 → CH2O2 Reactant bond energies: H–H is 432 kJ/mol, C=O is 7

Anna11 [10]

The energy absorbed by the system before the reaction start has been 752 kJ/mol.

The bond energy has been defined as the energy possessed by the bond that has been converted into the heat energy and utilized in the reaction.

The energy has been conserved in a chemical reaction. Thus, the energy absorbed by the reactant in the reaction has been the difference in the energy of the reactant and product.

<h3>Computation for the energy absorbed</h3><h3 />

The given reaction has been:

$\rm H_2\;+\;CO_2\;\rightarrow\;CH_2O_2$

The bond energy of the reactant has been:

H-H bond energy = 432 kJ/mol

2 C=O bond energy= 799 kJ/mol

The total energy of the reactant has been 432 kJ/mol + 799 kJ/mol

The total energy of the reactant has been 1231 kJ/mol

The bond energy of the product has been:

C-O bonds = 358 kJ/mol

C=O bonds = 745 kJ/mol

1 C-H bond = 413 kJ/mol

1 O-H bond = 467 kJ/mol

The total energy of the product has been 358 + 745 + 413 + 467 kJ/mol

The total energy of the product has been 1,983 kJ/mol

According to the law of conservation of energy:

$\text{Product energy=Reactant energy + energy absorbed}$

Substituting the values for energy absorbed:

$\text{1,983 kJ/mol=1231\;kJ/mol+ energy absorbed}\\\rm Energy\;absorbed=1983-1231\;kJ/mol\\Energy\;absorbed=752\;kJ/mol$

The energy absorbed by the system before the reaction start has been 752 kJ/mol.

Learn more about bond energy, here:

brainly.com/question/866298

7 0

2 years ago

A scientist discovers a new type of polymer. What must be true about this polymer?

DochEvi [55]

The correct answer is D

a polymer is a substance made up of large molecules with repeating sub units called monomers.

A is incorrect because its a ring structure which means it cannot form the long chain that is exhibited by polymers.

B is incorrect because the double bonds will cause saturation, hence no monomer can bond to another monomer to form the large molecule.

C is incorrect because the large molecule has repeating sub-units hence only specific types of molecules can be present, and it is usually carbon and hydrogen.

3 0

3 years ago

The amount of attraction between two masses depends on:

Zinaida [17]

Answer:

The strength of the gravitational force between two objects depends on two factors, mass and distance.

5 0

3 years ago