Discuss the function of a buffer. How will pH change when small amounts of acids or bases are added to the buffer solution?

Answers

Answer 1

Answer: Buffer solution is a blend that has the ability to prevent the pH of the solution from undergoing large variations. It is formed by a weak acid or base, and a salt of that acid or base.
Thus, the following species exist in this buffer solution:

H2CO3: present in great quantity, therefore, being a weak acid, it suffers little ionization;
H +: from the ionization of H2CO3;
HCO3-: also present in high quantity, from ionization of H2CO3 and dissociation of salt (NaHCO3);
Na +: from ionization of NaHCO 3;
If this solution is added a small concentration of acid, its ionization will occur, generating H + cations, which will react with the HCO3- anions present in the medium, giving rise to non-ionized carbonic acid. There is no change in pH.
If a base is added, OH- anions will be generated. These ions combine with the H + cations from the ionization of H2CO3. Thus, the OH- anions are neutralized, maintaining the pH of the medium.

To better understand the annex follows:

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Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively) were determined in earlier experiments. Calculate the average atomic mass of bromine based on these experiments.

Sarah is testing how quickly saltwater freezes. She adds saltwater to one ice tray and plain water to another ice tray. She places each tray in the freezer and records the time when each one starts to freeze. What treament did she do?. . A.Salt. B.Water. C.Freezer. D.Ice tray

Answers

The correct answer is A. Salt

That is because all of the conditions and the ingredients are the same. The one thing that makes the difference is the salt, which if removed, would cause everything to be the same. If she knows at how much regular water freezes, she can easily see how salt impacted the difference.

Answer:

salt

Explanation:

What kind of atmosphere does a gas giant have?

Answers

The atmosphere is thick and gaseous. The most common gases are helium and hydrogen.

A 3.0 M HCl(aq) solution contains a total of(1) 3.0 grams of HCl per liter of water
(2) 3.0 grams of HCl per mole of solution
(3) 3.0 moles of HCl per liter of solution
(4) 3.0 moles of HCl per mole of water

Answers

Answer : The correct option is, (3) 3.0 moles of HCl per liter of solution

Explanation :

Molarity : It is defined as the number of moles of solute present in one liter of the solution. The S.I unit of molarity is mole per liter.

It is represented as,

$Molarity=\frac{\text{Moles of solute}}{V_(solution)(L)}$

where,

V = volume of solution in liter

As we are given 3.0 M HCl(aq) solution this means that 3.0 moles of HCl present in one liter of solution.

Hence, a 3.0 M HCl(aq) solution contains a total of 3.0 moles of HCl per liter of solution.

Molarity = number of moles / volume in liters solution

Answer (3)

hope this helps!

Juan created a chart to help him study for a test.A 2-column table. The first column labeled X has entries some light is reflected, some light is absorbed, no light passes through. The second column labeled Y has entries some light is reflected, some light is absorbed, some light is reflected, most light passes through.

Which headings best complete the chart?

X: Transparent Objects
Y: Opaque Objects
X: Opaque Objects
Y: Transparent Objects
X: High Frequency Waves
Y: Low Frequency Waves
X: Low Frequency Waves
Y: High Frequency Waves

Answers

The light in the electromagnetic spectrum which passes in first case is through opaques objects while in second case it is transparent objects.

What is an electromagnetic spectrum?

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Answer:

B) X: Opaque Objects

Y: Transparent Objects

Explanation:

Just had this question and got it right

Write a chemical equation for the following decomposition reaction.Nickel(II) hydroxide(s) decomposes to produce nickel(II) oxide(s) and water.

Answers

the chemical equation will be Ni(OH)2(s)------>heat---> NiO(s) + H2O(g)
we know that the heat supplied to decompose the compound.In the result the product H2O is assumed to be in the vapor state so that is gas.

hope it helps

Final answer:

The decomposition of Nickel(II) hydroxide produces Nickel(II) oxide and water. The chemical equation is: Ni(OH)2 (s) → NiO (s) + H2O (l).

Explanation:

The decomposition reaction of Nickel(II) hydroxide into Nickel(II) oxide and water can be written as follows: Ni(OH)2 (s) → NiO (s) + H2O (l) . In this reaction, solid Nickel(II) hydroxide decomposes into solid Nickel(II) oxide and liquid water. It’s important to remember that in these reactions, a single, complex reactant breaks down into multiple, simpler products.

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You are walking in Paris alongside the Eiffel Tower and suddenly a croissant smacks you on the head and knocks you to the ground. From your handy dandy tourist guidebook you find that the height of the Eiffel Tower is 300.5 m. If you neglect air resistance, calculate how many seconds the croissant dropped before it tagged you on the head.

Answers

Neglecting air resistance (that is, if you and the Eiffel Tower were in a giant vacuum chamber), the bagel would take 7.804 s to hit you on the head.

I will assume that you are 1.8 m tall, so the distance the bagel falls before it hits you on the head is

300.5 m - 1.8 m = 298.7 m

One of the important equations relating distance and acceleration is

s = v₀ +½at², where

s = distance,
v₀ = initial velocity,
a = acceleration, and
t = time.

I also assume that the person at the top of the tower didn't throw the bagel down at you, so v₀ = 0.

a is the acceleration due to gravity, which is 9.8099 m·s⁻² in Paris.

s = v₀ + ½ at²

298.7 m = 0 + ½ × 9.8099 m·s⁻² × t²

298.7 = 4.9050 t² s⁻²

t² = $(298.7 \text m)/( 4.9050 \text s^(-2))$ = 60.898 s²

t = $\sqrt{60.898 s^(2)}$ = 7.804 s

The time taken for the croissant to hit you on the head assuming you are 1.5 m tall is 7.73 s

Considering the question given above, your height was not stated.