The ph of a buffer does not depend much on the concentrations of its acid–base conjugate pair because
Answers
Answer:
It could react with the present hydride or hydroxile ions.
Explanation:
Hello,
One the main features of buffers, is that when the acid-base conjugates are formed they could react with the added or
in order to keep the pH as constant as its buffer capacity allows it.
Best regards.
Final answer:
A buffer solution maintains a stable pH primarily through the action of its acid-base conjugate pair reacting to counter changes, a property known as buffer capacity. High concentrations increase buffer capacity, allowing more acid or base to be neutralized. However, exceeding the buffer capacity can lead to pH changes.
Explanation:
The pH of a buffer solution doesn't greatly depend on the concentrations of its acid-base conjugate pair as the buffer's job is to keep the pH relatively constant. This is achieved by having appreciable amounts of its weak acid–base pair in the solution. If a strong acid or base is introduced into the system, the buffer pair reacts to counteract these changes. This is called buffer capacity.
For instance, consider a buffered solution composed of acetic acid and its conjugate base, acetate. The system can resist changes in pH upon addition of small quantities of an acid or base. This is because acetic acid and acetate can consume small additions of hydrogen ions (from an acid) or hydroxyl ions (from a base), keeping the overall pH stable.
When concentrations of the acid-base pair are high, the buffer capacity increases and hence more amounts of acid or base can be neutralized without a significant change in pH. However, there are limits to this capacity. If excessive amounts of acid or base are added, they may exceed the buffer's capacity, and its acid/base pairs will be either largely consumed or overrun, leading to changes in pH.
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Answers
Given:
Molar Mass HBr = 80.904g/mol
Density solution = 1.24 g/mL
27.7%(wt/wt) HBr
Total mass of solution = volume(density) = 100mL (1.24 g/mL) = 124 g solution
Mass HBr in solution = 124g(0.277) = 34.348 g HBr
Moles HBr in solution = 34.348/80.904 = 0.4246 moles HBr
Molarity = moles solute/L solution = 0.4246 moles HBr/0.1 L solution
Molarity = 4.246 M
chemical precipitation of a solid
production of a gas
change in volume
Answers
Answer: Option (d) is the correct answer.
Explanation:
A change that does not cause any difference in chemical composition of a substance are known as physical change.
For example, shape, size, mass, volume, density, etc of a substance are all physical changes.
And, a change that causes changes in chemical composition of a substance is known as chemical change.
For example, precipitation, reactivity, toxicity etc are chemical change.
Therefore, change in temperature, chemical precipitation of a solid, production of a gas are all indications of a chemical change.
Thus, we can conclude that change in volume would not necessarily indicate a chemical reaction.
Final answer:
Of the options provided, a change in volume would not necessarily indicate a chemical reaction. It could also be a sign of a physical change, such as a change in state.
Explanation:
The question is asking which of the listed factors would not necessarily indicate that a chemical reaction has taken place. From the options provided, a change in volume is not necessarily indicative of a chemical reaction. Other signs (like change in temperature, chemical precipitation of a solid, or production of a gas) are often valid signs of a chemical reaction, however, just a volume change could also be a sign of a physical change, such as a change in state from solid to liquid, or liquid to gas.
For example, when ice melts to water, or water evaporates to steam, it experiences a change in volume. This does not involve the forming or breaking of chemical bonds, thus it's not a chemical reaction, but a physical change.
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2) oxidation-reduction
3) double replacement
4) acid-base neutralization
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In oxidation-reduction reactions (or redox reactions), a number of electrons are transferred between two species. During this process, the oxidation number of an atom (or molecule or ion) changes by receiving or losing an electron.
Answer: It is number 2
HBr
MgO
CO2
Answers
Answer:
CO2
Explanation:
A covalent compound is a compound between 2 nonmetals. For this reason, NaCl and MgO can be eliminated since both contain metals. While neither H nor Br are metals, in HBr H is acting as a metal. CO2 is the only choice containing both nonmetals, with both elements acting like nonmetals as well.
Answers
Answer:
d = 1.85 g/cm³
Explanation:
Given data:
Volume of sulfuric acid = 35.4 mL
Mass of sulfuric acid = 65.14 g
Density of sulfuric acid = ?
Solution:
1 ml = 1cm³
Formula:
d = m/v
d = 65.14 g / 35.2 cm³
d = 1.85 g/cm³