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3 years ago

Which equation best represents the dissociation of water molecules into hydrogen ions and hydroxide ions?

Chemistry

2 answers:

Nikitich [7]3 years ago

7 0

Answer is: H₂O → H⁺ + OH⁻.

Water dissociates (autoionization) to form hydrogen ions (H⁺) and hydroxide (OH⁻) ions. The protons (H⁺) hydrate as hydroxonium ions( H₃O⁺).

The Kw (the ionic product for water) at 25°C is 1·10⁻¹⁴ mol²/dm⁶ or 1·10⁻¹⁴ M². Concentration of hydrogen ions and hydroxide ions in pure water are the same.

SashulF [63]3 years ago

6 0

it is H2O ----> H+ + OH-

You might be interested in

How much energy does a 9 x 10^8m wavelength photon have?

murzikaleks [220]

<h3>Answer:</h3>

2.21 × 10^-18 Joules

<h3>Explanation:</h3>

<u>We are given;</u>

Wavelength of a photon as 9 × 10^-8 m

We are required to calculate the energy of the wave.

Energy of a photon is given by the formula;

E = hf , but f = c/λ

Thus, E = hc/λ

where, h is the plank's constant , 6.626 × 10^-34 J-s , c is the speed of light, 2.998 × 10^8 m/s, and λ is the wavelength.

Therefore;

E = (6.626 × 10^-34 J-s × 2.998 × 10^8 m/s) ÷ 9 × 10^-8 m

= 2.21 × 10^-18 Joules

Thus, the energy of the photon is 2.21 × 10^-18 Joules

6 0

3 years ago

In an acid-base titration experiment, 50 mL of a 0.05 M solution of acetic acid (Ka= 1.75 x 10-5 ) was titrated with a 0.05M sol

Viktor [21]

Answer:

(3) 5.36

Explanation:

Since this is a titration of a weak acid before reaching equivalence point, we will have effectively a buffer solution. Then we can use the Henderson-Hasselbalch equation to answer this question.

The reaction is:

HAc + NaOH ⇒ NaAc + H₂O

V NaOH = 40 mL x 1 L/1000 mL = 0.040 L

mol NaOH reacted with HAc = 0.040 L x 0.05 mol/L = 0.002 mol

mol HAC originally present = 0.050 L x 0.05 mol/L = 0.0025 mol

mol HAc left after reaction = 0.0025 - 0.002 = 0.0005

Now that we have calculated the quantities of the weak acid and its conjugate base in the buffer, we just plug the values into the equation

pH = pKa + log ((Ac⁻)/(HAc))

(Notice we do not have to calculate the molarities of Ac⁻ and HAc because the volumes cancel in the quotient)

pH = -log (1.75 x 10⁻⁵) + log (0.002/0.0005) = 5.36

THe answer is 5.36

5 0

3 years ago

Read 2 more answers

If an enclosure of 0.432 L has a partial pressure of O2 of 3.4×10−6 torr at 28 ∘C, what mass of magnesium will react according t

Mama L [17]

Answer:

184620169 g.

We can say that this mass corresponds to 184.6 ton

Explanation:

This is the reaction: 2Mg (s) + O₂(g) → 2MgO (s)

We have the data of O₂, so let's find out the moles with the Ideal Gases Law.

First of all, we convert pressure to atm

760 Torr / 3.4×10⁻⁶ Torr = 223529.4 atm

P .V = n . R . T

223529.4 atm . 0.432L = n . 0.082 L.atm/mol.K . 301K

(223529.4 atm . 0.432L) / (0.082 L.atm/mol.K . 301K) = 3798769 moles

Gosh!, These are a lot of moles.

Ratio is 1:2. So with 3798769 moles we would need the double of moles of Mg. → 3798769 mol .2 = 7597538 moles

Let's convert this moles into mass ( mol . molar mass)

7597538 mol . 24.3 g/mol = 184620169 g

We can convert this mass to ton

1 ton = 1×10⁶ g

184620169 g / 1×10⁶ g = 184.6 ton

5 0

4 years ago

Select which of the following is a major disadvantage of using nuclear power to generate electricity.

mixer [17]

Answer:

The power plants

are inexpensive to build

6 0

3 years ago

The density of ethanol is 0.789 g/mL. If you need 460.0 g of ethanol for an experiment, how many milliliters would you measure o

4vir4ik [10]

Answer:

The volume is 583.02 mL

Explanation:

Given that the density is:-

$\rho=0.789\ g/mL$

The mass, $m=460.0\ g$

The expression for the calculation of density is shown below as:-

$\rho=\frac{m}{V}$

Using the above expression to calculate the volume as:-

$V=\frac{m}{\rho}$

Applying the values to calculate the volume as:-

$V=\frac{460.0\ g}{0.789\ g/mL}=583.02\ mL$

<u>The volume is 583.02 mL.</u>

3 0

4 years ago