The pH of 0.10 M NH3 is closest to 11.14.
Option(A)
The Kb value for ammonia, NH3, is 1.8 × 10^-5 at 25°C. The expression for the Kb value is:
Kb = [NH4+][OH-]/[NH3]
where [NH4+] is the concentration of ammonium ion, [OH-] is the concentration of hydroxide ion, and [NH3] is the concentration of ammonia. We can use the relationship Kw = Ka × Kb, where Kw is the ion product constant for water (1.0 × 10^-14 at 25°C) and Ka is the acid dissociation constant for NH4+.
Ka can be calculated from the following equation:
Ka = Kw/Kb = (1.0 × 10^-14)/(1.8 × 10^-5) = 5.56 × 10^-10
At equilibrium, the following reaction occurs:
NH3 + H2O ⇌ NH4+ + OH-
Since NH3 is a weak base, we can assume that its initial concentration is equal to its equilibrium concentration. Therefore, we can use the Kb expression to solve for [OH-]:
Kb = [NH4+][OH-]/[NH3] => [OH-] = Kb[NH3]/[NH4+] = (1.8 × 10^-5)(0.10)/[NH4+]
Since NH4+ is the conjugate acid of NH3, we can assume that it is formed by the reaction of NH3 with water:
NH3 + H2O ⇌ NH4+ + OH-
Therefore, the concentration of NH4+ is equal to [H3O+], and we can use the expression for the acid dissociation constant to solve for [H3O+]:
Ka = [NH4+][H3O+]/[NH3] => [H3O+] = Ka[NH3]/[NH4+] = (5.56 × 10^-10)(0.10)/[NH4+]
Since the solution is in equilibrium, [OH-][H3O+] = Kw = 1.0 × 10^-14. Therefore:
[OH-][H3O+] = (1.8 × 10^-5)(0.10)[NH4+]/[NH3] × (5.56 × 10^-10)(0.10)[NH3]/[NH4+] = 1.0 × 10^-14
Simplifying this equation, we get:
[NH4+][OH-] = 1.0 × 10^-14
Substituting [OH-] = (1.8 × 10^-5)(0.10)/[NH4+] into this equation, we get:
[NH4+] = 0.10/(1.8 × 10^-5)(1.8 × 10^-5)(0.10) = 3.086 M
Finally, we can calculate the pH of the solution using the expression:
pH = -log[H3O+] = -log[(5.56 × 10^-10)(0.10)/3.086] = 11.14 Option(A)
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The pH of 0.10 M NH3 is closest to 11.14. Option(A) Finally, we can calculate the pH of the solution using the expression: pH = -log[H3O+] = -log[(5.56 × 10^-10)(0.10)/3.086] = 11.14 Option(A).
The Kb value for ammonia, NH3, is 1.8 × 10^-5 at 25°C. The expression for the Kb value is:
Kb = [NH4+][OH-]/[NH3]
where [NH4+] is the concentration of ammonium ion, [OH-] is the concentration of hydroxide ion, and [NH3] is the concentration of ammonia. We can use the relationship Kw = Ka × Kb, where Kw is the ion product constant for water (1.0 × 10^-14 at 25°C) and Ka is the acid dissociation constant for NH4+.
Ka can be calculated from the following equation:
Ka = Kw/Kb = (1.0 × 10^-14)/(1.8 × 10^-5) = 5.56 × 10^-10
At equilibrium, the following reaction occurs:
NH3 + H2O ⇌ NH4+ + OH-
Since NH3 is a weak base, we can assume that its initial concentration is equal to its equilibrium concentration. Therefore, we can use the Kb expression to solve for [OH-]:
Kb = [NH4+][OH-]/[NH3] => [OH-] = Kb[NH3]/[NH4+] = (1.8 × 10^-5)(0.10)/[NH4+]
Since NH4+ is the conjugate acid of NH3, we can assume that it is formed by the reaction of NH3 with water:
NH3 + H2O ⇌ NH4+ + OH-
Therefore, the concentration of NH4+ is equal to [H3O+], and we can use the expression for the acid dissociation constant to solve for [H3O+]:
Ka = [NH4+][H3O+]/[NH3] => [H3O+] = Ka[NH3]/[NH4+] = (5.56 × 10^-10)(0.10)/[NH4+]
Since the solution is in equilibrium, [OH-][H3O+] = Kw = 1.0 × 10^-14. Therefore:
[OH-][H3O+] = (1.8 × 10^-5)(0.10)[NH4+]/[NH3] × (5.56 × 10^-10)(0.10)[NH3]/[NH4+] = 1.0 × 10^-14
Simplifying this equation, we get:
[NH4+][OH-] = 1.0 × 10^-14
Substituting [OH-] = (1.8 × 10^-5)(0.10)/[NH4+] into this equation, we get:
[NH4+] = 0.10/(1.8 × 10^-5)(1.8 × 10^-5)(0.10) = 3.086 M
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Vanadium (V) is element 23 on the periodic table. A sample contains 2.88x1022 atoms of V. Calculate the amount of V.
1 pt
x mol V
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Which type of cell is associated with the statements below? Fill in the blank with either (voltaic cell, electrolytic cell, both).
Non-spontaneous reaction occurs:
Spontaneous reaction occurs:
Oxidation occurs at anode:
Electrolyte supports electron flow:
Answer:
Non-spontaneous reaction occurs: electrolytic cell.
Spontaneous reaction occurs: voltaic cell
Oxidation occurs at anode: both
Electrolyte supports electron flow: both
Explanation:
How many electrons are needed in the outer energy levels of most atoms to be chemically stable?
Answer:
8 electrons
Explanation:
Why is red tide dangerous to ocean animals?
Answer:
Karenia brevis produces toxins called brevetoxins that affect a variety of marine wildlife. Aquatic organisms can be exposed to brevetoxins in several ways: coming into contact with K. brevis cells or toxins in the water, ingesting cells, inhaling toxins and consuming toxic prey.
Explanation:
If you tested two samples of a particular pure substance, what would you find?
Answer:
The properties of a pure substance can be used to determine whether a sample is a pure substance or mixture because the characteristic properties of matter can be used to identify a sample. The result is a mixture called a composite.
Explanation:
Pure substances contains their own molecules only and not any impurity. Thus, when we tested it only shows the properties of its own.
What are pure substances?Pure substances are substances containing its pure composition without any impurities. For example water, fruits, acids etc. are pure substances and they does not have a combination other substances.
Mixtures are the combination of two or more pure substances, and the can be heterogenous or homogenous. Whereas, pure substances homogenous only thus forming only one phase.
When we tested mixtures qualitatively, they shows the properties of each individual components in it. Whereas, pure substances give inly its own characteristics.
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How many atoms would you find in 3.60 g of Boron?
Answer:
1.8 * 10^24 atoms
Explanation:
n = M(B) / m = 10.8 / 3.60 = 3 mol
N = n * Na = 3 * 6*10^23 = 1.8 * 10^24 atoms
Two students conduct the same experiment, but they get different results. What should the students do next?A.The students should check their procedure and tools for sources of error. B.Both students should throw out their data and start over. C.The students should compare data with other students and then use the data from the student who was closest to the rest of the class. D.The students should find the average of each data set and each report the average data.
Answer:
A.The students should check their procedure and tools for sources of error.
Explanation:
Answer:
I think it A
Explanation:
The density of water H20 is bout 1 g/ml. If u have a bottled water that is 500 ml how many grams is this
Answer:
500 grams
Explanation:
500 milliliters x 1 gram per millileter = 500 grams.
What type of weathering occurs when acid rain changes rocks? A. erosion
B. deposition C. chemical weathering D. physical weathering
Answer:
c...................................
What type of heat transfer causes the water in the bottom of the pool to be cooler and the water at the top to be warm?
Answer:
i think its convection
Explanation:
what is an accurate description of a period in the periodic table
Answer:
The periods of the periodic table are the horizontal rows.
Explanation:
Answer:
period is a horizontal row of the periodic table
Explanation:
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor
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What does it mean if a solution is a "weak acid "? Strong acid? Give logical ph values for each
Answer:
A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid fully dissociates into its ions in water. At the same concentration, weak acids have a higher pH value than strong acids.
Explanation:
:)
Given a 6.80 g sample of H2O how many grams of oxygen is produced assuming the decomposition goes to completion
Answer:
6.0444g
the formula must be after balancingknown as 36(mass) of H2O can produce 32(mass) of O2so 6.80g of H2O can produce (x)g of oxygenAccording to the stoichiometry of the decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
What is stoichiometry?Stoichiometry is defined as the determination of proportions of elements or compounds which are present in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.According to the reaction, 36 g water gives 32 g oxygen thus 6.80 g water will give 6.80×32/36=6.04 g.
Thus, on decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
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industrial gases cause acid rain why
because the industrial gas is very harmful for us it is made up chemical and toxic gases
Answer:
The usual culprit is burning coal.
Explanation:
This produces a lot of carbon dioxide as well as sulphur dioxide. Other industrial processes, and vehicle emissions, produce similar oxides unless they are 'scrubbed' out. They react with atmospheric moisture to produce acids like carbonic, sulphurous and nitrous acids. Which is then precipitated. It should be remembered that a volcanic eruption has this effect too.
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The octet rule states that atoms tend to form bonds so that each atom has eight ________ in its _______
shell
Answer:
electrons..............
Answer:
electrons, outer
Explanation:
how much empty space was there in the medium-sized rock sample
Answer:
I'm assuming this is from a lab that you did - in which case, I can't really help you out here.
Explanation:
biology and physics are so closely related that sometimes the fields overlap. what experiment might both biologist and physicists do
Answer:
Study how the body's nerve cells react to an electrical shock.
Explanation:
Answer:
Study how the body's nerve cells react to an electrical shock.
Explanation:
a p ec
Plants cells also gain energy through cellular respiration.
True or false?
Answer:
true
Explanation:
What is the difference between an empirical formula and a molecular formula?
Answer:
The empirical formula simply states the ratios of the elements that make up the molecule, while molecular formulas specify the amounts of each element exactly, not just giving the ratio. Let's take ethane (C2H6) as an example.
What is the acceleration due to gravity at Earth's surface?
Answer:
9.8 m/s2
Explanation:
That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.
1. How many moles does 24 g of Mg contain?
Explanation:
1 mole Of atom = GAM
MG=24g
GAM of Mg=24g
Therefore 24g=mole
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Write the word and balanced chemical equations for the reaction between:
Aluminum + iron sulfate
Explanation:
Aluminium - Al
Iron Sulfate - FeSO4
The reaction is given as;
Al + FeSO₄ --> Al₂ (SO₄) ₃ + Fe
The balanced equation is given as;
2 Al + 3 FeSO₄ --> Al₂ (SO₄) ₃ + 3 Fe
In words it is given as;
Aluminium + Iron Sulfate --> Aluminium Sulfate + Iron
Which statement about copper, diamond, and silicon(IV) dioxide is correcta)Copper and silicon(IV) dioxide have similar electrical conductivityb)In diamond the carbon atoms are covalently bonded as flat sheetsc)In silicon(IV)dioxide the silicon and oxygen atoms are covalently bonded in flat sheetsd)The structure of copper includes a lattice of positive ions
Answer:
In diamond the carbon atoms are covalently bonded as flat sheets
In silicon(IV) dioxide the silicon and oxygen atoms are covalently bonded in flat sheets
The structure of copper includes a lattice of positive ions
Explanation:
Diamond and silicon(IV) dioxide are covalent network solids. Covalent network solids are made up of atoms joined to one another by covalent bonds to form a giant lattice, The solids are hard and have a very high melting point. They do not conduct electricity. So, for both diamond and SiO2, atoms are covalently bonded to yield flat sheets in a covalent bonded network solid.
Copper is a metallic substance having metallic bonds, a metallic crystal consists of positive ions and a cloud of electrons.
What is the proper name for the chemical formula Cl4O5?
Answer:
Carbon tetraiodide
Explanation:
let me know if it works
Can someone please explain to me what a Ecologist does for a living? (Or daily in their career?)
ecologists look at relationships between nature, studying the interactions between humans, animal and plants.
Answer:
Ecologists focus on the relationship of organisms within their environment. Ecology is a branch of biology (biology is the study of life). Given the broad scope of ecology, there are multiple sub-disciplines that an ecologist can choose to focus on. Since all living things (plants, animals, microbes) depend on other living things and a healthy environment to survive, ecologists may specialize in one aspect of an ecosystem. Examples include terrestrial (land), aquatic (water), applied (concepts and principles of ecology), conversation (management of biodiversity), and evolutionary (evolution).
Explanation:
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Choose the formula for calculating percent composition.
Answer:
The equation for percent composition is (mass of element/molecular mass) x 100.
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according to the ____ rule, elements tend to react until they have the same electron configuration as a _____. _____, found on the left of the _____, tend to lose electrons and from ____. _____ tend gain electrons to form _____.
Answer:
What chapter is this and what grade are you, i can check this for you
Explanation:
Find the amount of water containing 14.02 * 10²⁴ molecules
Answer:
14.02 x 10²⁴ molecules
Explanation:
To solve this problem we will use Avogadro's number: It relates to the number of molecules (or atoms) contained in 1 mol of any given substance:
14.02 x 10²⁴ molecules ÷ 6.023 x 10²³ molecules/mol = 23.28 molesThus, 23.28 moles of water contain 14.02 x 10²⁴ molecules.
A 4 feet tall student went summing pool. He saw depth of water in pool less than 4 feet.Will he drowned.Write reason
Answer:
Question says , the height of the student = 4 feet, ... This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.
Which phrases describe the oceans? Check all that apply.
cover more than 70 percent of Earth
provide oxygen for life on Earth
contain fresh water
constantly in motion
interact with other Earth systemsWhich was found to be unconstitutional based on the Supreme Court’s ruling in Scott v. Sandford?
Answer:
the first one is the answer
Answer:
Phrases that describe the oceans are
cover more than 70 percent of Earth
constantly in motion
interact with other Earth systems
Explanation:
What are the two most important properties of ocean water?
Two of the most important characteristics of ocean water are its temperature and salinity.