The pH value will be equal to 3.29 at the equivalence point.
What is titration?Titration is the laboratory method that is performed to determine the concentration of the analyte. An indicator is used to know the equivalence point.
Given the concentration of HBr = 0.12 M
The concentration of ammonia = 0.12 M
The value of Kb for ammonia = 1.8 ×10⁻⁵
The chemical reaction is :[tex]NH_3 + HCl \longrightarrow NH^+_4 + Cl^-[/tex]
For the ammonia: NH₃ NH₄⁺ H⁺
Initial conc.: 0.12 M ---- -----
Change: - x + x +x
At equilibrium: 0.12-x x x
The acid dissociation constant :[tex]K_a =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]
[tex]\frac{K_w}{K_b} =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]
[tex]\frac{1\times 10^{-14}}{1.8\times 10^{-5}} =\frac{(x)(x)}{(0.12-x)}[/tex]
[tex]5.56\times 10^{-10}=\frac{x^2}{0.12-x}[/tex]
x² + 5.56× 10⁻⁵ x- 46.33 × 10⁻¹⁰ = 0
x = 4.57 × 10⁻⁵
The concentration of hydrogen ions = 4.57 × 10⁻⁵
The pH value = - log [H⁺]
pH = -log [4.57 × 10⁻⁵]
pH = 3.29
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moles in 5.92 x 10^24 atoms P
Answer:
9.83039 moles i think this is the answer
A carbon-carbon double bond is ______ than a carbon-carbon triple bond, and ______ than a carbon-carbon single bond.
Answer:
longer, shorter
Explanation:
A carbon-carbon double bond is longer than a carbon-carbon triple bond, and shorter than a carbon-carbon single bond
What would be the freezing point of a solution that has a molality of 1.324 m which was prepared by dissolving biphenyl (C12H10) into naphthalene
The freezing point of a 1.324 m solution, prepared by dissolving biphenyl into naphthalene, is 71.12 ° C.
A solution is prepared by dissolving biphenyl into naphthalene. We can calculate the freezing point depression (ΔT) for naphthalene using the following expression.
[tex]\Delta T = i \times Kf \times m = 1 \times 6.90 \°C/m \times 1.324m = 9.14 \°C[/tex]
where,
i: van 't Hoff factor (1 for non-electrolytes)Kf: cryoscopic constantm: molalityThe normal freezing point of naphthalene is 80.26 °C. The freezing point of the solution is:
[tex]T = 80.26 \° C - 9.14 \° C = 71.12 \° C[/tex]
The freezing point of a 1.324 m solution, prepared by dissolving biphenyl into naphthalene, is 71.12 ° C.
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How many atoms of potassium make up one mole?
https://tex.z-dn.net/?f=%5Csqrt%7Bx%7D%20%5Cneq%20%5Cneq%20%20%5Clim_%7Bn%20%5Cto%20%5Cinfty%7D%20a_n%20%5Cint%5Climits%5Ea_b%20%7Bx%7D%20%5C%2C%20dx%20x%5E%7B2%7D%20%5C%5C%20%5C%5C%20%5Cleq%20%5C%5C%0
Answer:
6.022×1023
Explanation:
There are 6.022 × 1023 atoms of potassium in every mole of potassium. Since one mole of KOH contains one mole of K, the answer is 6.022×1023 atoms of K.
2. phosphorus
How many valance electrons are in phosphorus
Answer:
5 valance electrons
Explanation:
Phosphorus has 5 valance electrons because it is in the group 15. Phosphorus has 3 rings, 2, 8, and 5. The third ring is not full which means those are the valance electrons.
What part of an investigation is only found in an experimental investigation
Answer:
control group
Explanation:
Answer:
control book
Explanation:
I found it online and it's very helpful
Why are x-rays and the radiation emitted by radioisotopes called ionizing radiation?
Answer:
The radiation has enough energy to knock electrons off some atoms of a bombarded substance producing ions.
Explanation:
Which element has 2 energy shells and 2 valence electrons
Helium
Helium has 2 electrons both in the first shell (so two valence electrons).
Hope this helps :)
How many CO2 molecules are in 1 mole of carbon dioxide?
Answer:
I guess 1-mole carbon dioxide contains 6.02 x 10^23 molecules.
A compound with an empirical formula of CH2O has a molar mass of 150. g. The molecular formula of this compound is
Answer:
C5H10O5
Explanation:
what is the molarity of an acetic acid solution if 25.0mL of the Hc2H3O2 solution is titrated with 29.7 mL of a 0.205 M KOH solution
The molarity of the acetic acid, HC₂H₃O₂ solution is 0.244 M
We'll begin by writing the balanced equation for the reaction
HC₂H₃O₂ + KOH —> KC₂H₃O₂ + H₂O
From the balanced equation above,
The mole ratio of the acid, HC₂H₃O₂ (nA) = 1
The mole ratio of the base, KOH (nB) = 1
From the question given above, the following data were obtained:
Volume of the acid, HC₂H₃O₂ (Va) = 25 mL
Volume of the base, KOH (Vb) = 29.7 mL
Molarity of the base, KOH (Mb) = 0.205 M
Molarity of the acid, HC₂H₃O₂ (Ma) =?MaVa / MbVb = nA/nB
(Ma × 25) / (0.205 × 29.7) = 1
(Ma × 25) / 6.0885 = 1
Cross multiply
Ma × 25 = 6.0885
Divide both side by 25
Ma = 6.0885 / 25
Ma = 0.244 MTherefore, the molarity of the acetic acid, HC₂H₃O₂ solution is 0.244 M
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What useful functions do oxidation numbers serve?
Explanation:
Oxidation Numbers. It is often useful to follow chemical reactions by looking at changes in the oxidation numbers of the atoms in each compound during the reaction. Oxidation numbers also play an important role in the systematic nomenclature of chemical compounds.
brainliest please
how many nitrogen atoms should appear on the right side of this equation 2AgNO3+Cu=?
Answer:
One.
Explanation:
Both sides of the equation need 2 Silver atoms, 1 Nitrogen, 3 Oxygen and 1 Copper to be balanced which is the same as the side of reactants.
___AsCl3+____H2S-->___As2S3+___HCI
Answer:
2 AsCl₃ + 3 H₂S → As₂S₃ + 6 HCl
Explanation:
When we balance a chemical equation, what we are trying to do is to achieve the same number of atoms for each element on both sides of the arrow. On the right of the arrow is where we can find the products, while the reactants are found on the left of the arrow.
We usually balance O and H atoms last.
AsCl₃ + H₂S → As₂S₃ +HCl
reactants
As --- 1
Cl --- 3
H --- 2
S --- 1
products
As --- 2
Cl --- 1
H --- 1
S --- 3
2 AsCl₃ + H₂S → As₂S₃ +HCl
reactants
As --- 2
Cl --- 6
H --- 2
S --- 1
products
As --- 2
Cl --- 1
H --- 1
S --- 3
The number of As atoms is now balanced.
2 AsCl₃ + 3 H₂S → As₂S₃ +HCl
reactants
As --- 2
Cl --- 6
H --- 6
S --- 3
products
As --- 2
Cl --- 1
H --- 1
S --- 3
The number of S atoms is now equal on both sides.
2 AsCl₃ + 3 H₂S → As₂S₃ + 6 HCl
reactants
As --- 2
Cl --- 6
H --- 6
S --- 3
products
As --- 2
Cl --- 6
H --- 6
S --- 3
The equation is now balanced.
Identify the correct description for each part labeled on the diagram
A
B
C
D
E
F
Answer:
No Specific question
Explanation:
Answer:
A: heating solid
B: melting
C: heating liquid
D: boiling
E: heating gas
F: melting point
Explanation: got it right
Balancing Chemical Equation
C=H2=CH4
Answer:
C + 2H2 ⇒ CH4
Explanation:
In order to balance a chemical equation you need to make sure that the number of atoms on both sides are equal
C + H2 = CH4
C = 1
H = 2
Products:
C = 1
H = 4
H2 = 2 × 2 = 4
C + 2H2 ⇒ CH4
Hope this helps.
Which statement is true about electronegativity?
A. Electronegativity generally decreases from left to right across a period.
B. Electronegativity is the ability of an anion to attract another anion.
C. Electronegativity generally is higher for metals than for nonmetals.
D. Electronegativity generally increases as you go from bottom to top in a group.
Answer:
electronegativity generally increase as you go from bottom to top group
describe las moléculas
Answer:
A little portion of a substance that has all of the substance's physical and chemical properties. If a molecule has more than one atom, the atoms might be identical (a molecule of oxygen contains two atoms of oxygen) or distinct (a molecule of water contains two atoms of hydrogen and one atom of oxygen).
Explanation:
What is the science behind procrastination? Most descriptive and accurate answer will receive brainliest.
Answer:
Explanation:
Procrastination is a plague to which we are all susceptible. Essentially, procrastination is the avoidance of work or necessary tasks by focusing on more satisfying activities. It’s easy to chalk procrastination up to a lack of self-motivation, lazy habits or incompetence. But in reality, procrastination is chemical; there’s a science to why we prefer relaxing activities to the required.
Procrastination boils down to a battle between the limbic system and the prefrontal cortex. The limbic system is a set of brain structures containing the pleasure center, while the prefrontal cortex controls planning and decision making. The prefrontal cortex is less developed and thus weaker, so often times the limbic system wins out, leading to procrastination.
Part B
Decide which molecules in the simulation will represent the substances from the actual reaction. Include a strategy to deal with the difference in structure between the actual reaction N2 + 3H2 ⇌ 2NH3 and the simulated reaction. Not all molecules need to be used.
Simulation of a reaction is a chemical reaction modeling or demonstration tool, using various software to better understand the molecular structure and the physical and chemical properties of the molecule. Here the actual reaction is N2 + 3H2 -----> 2NH3. In the simulation reactions, the nitrogen and hydrogen molecules in the actual reaction are described by different colored circles or dots and the bonds are produced using a single, double or triple line that touches each molecule and gives an appearance like the reactants and the products' ball and stick model. Example: Molecule of nitrogen as o---triple line---o. A molecule of hydrogen as O———O. Chemical symbols such as N and H are expressed in Actual Chemical Reaction, N2 and H2 and the bonds are represented by single, double or triple lines that do not impact the atoms in the molecule as follows: Nitrogen Molecule: N -triple Bond- N. Hydrogen Molecule: H - H. Hope it helps ya
In the simulation reactions, the nitrogen and hydrogen molecules in the actual chemical equation are described by different colored circles or dots and the bonds are produced using a single, double or triple line that touches each molecule.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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To what temperature must an ideal gas at 27°C be cool to reduce its volume by 1/3
What form of energy does the swinging pendulum represent?
Mechanical energy
Radiant energy
Chemical energy
Electrical energy
----------------------------------------------------------------------
At which position is the potential energy of the pendulum the greatest?
Position C
Position A
Position B
Position D
Answer:
The answer for the first question is Mechanical energy and the second one is position A.
Can some help me please
How can fungi be used to be treat diseases?
The medicinal effects attributed to fungi, based mainly on uncharacterized substances or extracts, include antiviral, immunomodulatory, antitumor, antioxidant, radical scavenging, anti-inflammatory, antihyperlipidemic or antihypercholesterolemic, hepatoprotective, and antidiabetic effects.
Occurs because of pressure differences around the equator.
Answer:
Pressure Differences occur as result of heating differences
Explanation:
Pressure differences usually occur as a result of heating differences ... most heat is contained near the equator, where most of the heating occurs
1. ____ is the measure of the pull of gravity on an object.
2. ____ is the force of attraction between all objects.
3. The forces of gravity depends on the ___ of the objects & how ___ apart they are.
4. ____ can change because the pull of gravity is not the same everywhere.
5. The ____ of and object always remains the same, regardless of the ____
1. weight
2. gravity
3. mass, far(distance)
4. weight
5. mass, ?
Please Help (80 Points)
Describe two conditions needed for a molecule to be polar
Answer:
1. The molecule must possess polar covalent bonds in its structure
2. The molecule must have a NET DIPOLE moment
Explanation:
Polar molecules occur when two atoms do not share electrons equally in a covalent bond. A dipole forms, with part of the molecule carrying a slight positive charge and the other part carrying a slight negative charge. This happens when there is a difference between the electronegativity values of each atom.
Polar molecules have an asymmetrical form and polar covalent connections due to atoms' different electronegativities, resulting in an unequal electron density distribution and a net dipole moment.
To determine the polarity of a molecule, two conditions need to be satisfied:
The molecule must have an asymmetrical shape, and its electron density must be irregular. When the atoms that make up the molecule have different electronegativities, the electrons are drawn to one atom in the molecule more than they are drawn to another. Because of this excess electron density, one side of the molecule will become slightly negative (-), while the other side will become slightly positive (+).
Polar Bonds: In order for the molecule to function properly, it must contain polar covalent bonds. When two atoms with differing electronegativities share electrons in an unequal manner, a polar covalent bond is formed. This results in one atom having a partial positive charge and the other atom having a partial negative charge. When a molecule has multiple polar covalent connections and an asymmetrical shape, the dipole moment of the molecule is said to be polar.
Polarity can be attributed to the asymmetrical bent shape of water (H2O) as well as the covalent interactions between hydrogen and oxygen. Due to the fact that oxygen has a greater electronegative potential than hydrogen, electrons are drawn towards oxygen, which results in oxygen atoms having a partial negative charge whereas hydrogen atoms have a partial positive charge.
Because of the varying electronegativity of the atoms, a polar molecule needs to have an asymmetrical structure and polar covalent bonds in order to exist. As a result of these conditions, polar molecules possess an uneven distribution of their electron density as well as a net dipole moment.
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how to find the molar mass of two elements when given the molecular weight of the compound and the percent composition
Answer: To do this, you must divide the mass of each element by its molar mass. Use the periodic table to find the molar mass of each element. Calculate the number of moles of each component element in the compound. A compound is 2.00% H by mass, 32.7% S by mass, and 65.3% O by mass.
Explanation:
I am a gas with a mass number of 19.
Answer:
Element Fluorine
Explanation:
The chemical element fluorine is a gas that has a mass number of 19.
The gas with a mass number of 19 is potassium-39 (K-39).
Potassium-39 is an isotope of potassium, which is an alkali metal element found in Group 1 of the periodic table. The atomic number of potassium is 19, indicating the number of protons in its nucleus, while the mass number represents the total number of protons and neutrons in the atom.
Potassium-39 is the most abundant naturally occurring isotope of potassium, accounting for about 93% of its isotopic composition. It is stable and non-radioactive. Potassium as a whole is an essential element for many biological processes and is found in various foods. It plays a crucial role in nerve function, muscle contraction, and maintaining electrolyte balance in the body.
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Can someone help me please
Answer:
13) Carbon Dioxide and water
Explanation:
The fact is that during photosynthesis, Carbon Dioxide is needed by green plants to manufacture their food and water is also needed but also chloroplast which contained chlorophyll is also needed
hence, the options are somehow confusing
14) perhaps it should be all of the above
