Answer:
pH = 2.98
Explanation:
pKa of HNO2 is 3.35
HNO2 reacts with NaOH as follows:
HNO2 + NaOH → NaNO2 + H2O
Where moles of NaOH added are equal to NaNO2 produced
And initial moles of HNO2 - Moles NaOH = Moles HNO2
Initial moles HNO2:
0.0200L * (0.10mol/L) = 0.00200moles HNO2
Moles NaOH = Moles NaNO2:
0.0100L * (0.10mol/L) = 0.00100 moles NaOH = Moles NaNO2
Moles HNO2:
0.00200moles - 0.00100moles = 0.00100 moles HNO2
Then, the added HCl reacts with NaNO2 producing HNO2:
HCl + NaNO2 → HNO2 + NaCl
Where moles added of HCl are moles of HNO2 produced and initial moles of NaNO2 - moles of HCl = Moles NaNO2
Moles HCl:
4x10⁻⁵L * (10.0mol / L) = 0.00040moles HCl = Moles of HNO2 produced
Moles HNO2:
0.00100moles + 0.0004moles = 0.0014moles HNO2
Moles NaNO2:
0.00100moles - 0.0004moles = 0.0006moles NaNO2
With these moles and H-H equation we can solve for the pH of the buffer:
pH = pKa + log [NaNO2] / [HNO2]
Where pH is pH of the buffer
pKa is pKa of HNO2: 3.35
[] are moles of each species:
Replacing:
pH = 3.35 + log [0.0006moles NaNO2] / [0.0014moles HNO2]
pH = 2.98
Why would Magnesium Phosphate (Mg3(PO4)2) not make an aqueous solution?
Please help!
Answer:
[tex]\boxed {\boxed {\sf Almost \ all \ phosphates \ are \ insoluble}}[/tex]
Explanation:
For magnesium phosphate to make an aqueous solution, it must be soluble in water.
Let's check the solubility rules. There are many different lists and versions, but it should mention a rule about phosphates.
All phosphates are insoluble except Na₃PO4 (sodium phosphate), K₃PO4 (potassium phosphate), and H₁₂N₃PO₄ (ammonium phosphate).Magnesium phosphate is included in "all phosphates" so it is insoluble and can't become an aqueous solution.
Magnesium Phosphate (Mg₃(PO₄)₂) would not make an aqueous solution because it is insoluble in water.
A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
solvent: the substance in which a solute dissolves to produce a homogeneous mixture.solute: the substance that dissolves in a solvent to produce a homogeneous mixture.According to the solubility rule, all phosphates are insoluble in water except sodium and potassium phosphates and thus magnesium phosphate does not form an aqueous.
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Which of the following is an example of how the need to maintain
homeostasis can cause an organism to change its behavior?
please answer quickly!!!!
(examples in the photo)
Answer:
C. A human shivers when exposed to cold weather.
Explanation:
Homeostasis simply refers to balance, which is desirable in the context of an organism. In this problem, the only one that demonstrates this is a human shivers when exposed to cold weather. By using kinetic energy, heat is generated, maintaining a balance, so to speak.
(btw you may find it more helpful to post these types of problems under biology in the future.)
1. A force of 30N is applied to a screwdriver to pry the lid off of a can of paint. The
screwdriver applies 90N of force to the lid. What is the MA of the screwdriver?
Answer:
I would guess that the MA of the screwdriver is 120N.
Explanation:
I think this because you are adding 30 and 90, since there are two forces being acted on the same place in the same direction.
#teamtrees #WAP (Water And Plant)
organic chemical used to preserve biological specimens is organic compound or hydrocarbons
Answer:
hydrocarbons
Explanation:
hope this is right.. if not sorry:)
how does increasing the height of an object affect its mechanical energy
Answer:
The amount of work required to raise the TV from point A to point B is equal to the amount of gravitational potential energy the TV gains from its height above the ground. This is generally true for any object ...
which of the following turns blue with a universal indicator (Litmus paper)
1. all
2. salt
3. base
3. acid
base
This is the answer
What is the molarity of a solution of 4.50 g
of NH4Br in enough H2O to make 213 mL of
solution?
Answer in units of M.
Answer:
M = 0.23 M
Explanation:
Given data:
Molarity of solution = ?
Mass of NH₄Br = 4.50 g
Volume of solution = 213 mL (213 mL× 1L /1000 mL = 0.213 L)
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of NH₄Br:
Number of moles = mass/molar mass
Number of moles = 4.50 g / 97.94 g/mol
Number of moles = 0.05 mol
Molarity:
M = 0.05 mol/ 0.213 L
M = 0.23 M
c. If the average basal rate of oxygen consumption for an adult is 15 L/hour, then calculate how many hours of oxygen use will you get from the 4.7 L tank?
Answer:
0.3hrs
Explanation:
Given parameters:
Average basal rate = 15L/hr
Volume of oxygen = 4.7L
Unknown:
Hours of oxygen use = ?
Solution:
Now to solve this rate problem, we need to find the time;
Hours of oxygen use = [tex]\frac{volume of oxygen }{average basal rate}[/tex]
Hours of oxygen use = [tex]\frac{4.7}{15}[/tex] = 0.3hrs
If you have 10 grams of Aluminum and a 500 gram Aluminum bottle with different volumes. Explain why the density will be the same.
What volume of H2so4 Solution Cspecific gravity=-1.28 and strength =24.7% by mass) will be required to react completely with 125g ZnC032?
The volume = 309.04 ml
Further explanationGiven
Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄
mass 125g of ZnC0₃
Required
The volume of H₂SO₄ Solution
Solution
Reaction
ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O
mol of ZnCO₃(MW=125.4 g/mol) :
[tex]\tt mol=\dfrac{125}{125.4}=0.997[/tex]
From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997
mass of H₂SO₄ (MW=98 g/mol) :
[tex]\tt mass=mol\times MW=0.997\times 98=97.706~g[/tex]
mass of solution :
[tex]\tt \dfrac{100}{24.7}\times 97.706=395.57~g[/tex]
Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)
[tex]\tt V=\dfrac{395.57}{1.28}=309.04~ml[/tex]
6. According to the ideas of Democritus and Dalton, which of the following
statements is true about a piece of copper wire that s cut into the smallest
possible pieces? *
the copper will change properties and become a new element
the smallest piece of copper is no longer copper
the wire is still copper and does not change by cutting it
Answer: The wire is still copper and does not change by cutting it
Explanation:
Democritus postulated that all materials were composed of these tiny particles called as "atomos".
Daltons postulates are:.
1. All matter is made of very tiny particles called atoms.
2. Atoms is indivisible.
3. Atoms of a given element are identical in mass and chemical properties.
4. Atoms of different elements have different masses and chemical properties.
5. Atoms combine in the ratio of small whole numbers to form compounds.
6. The relative number and kinds of atoms are constant in a given compound.
Thus when copper wire is cut into the smallest possible pieces, the atoms were intact as they are indivisible and all atoms have same mass and chemical properties.Thus the wire is still copper and does not change by cutting it
PLEASE HURRY IM BEING TIMED time: 1:55:40
Which number belongsin the space labeled X?
O5
O7
O8
O 10
Answer:
a.) x = 5
Explanation:
If I have 80 grams of H2 how many molecules of H2 do I have?
Answer:
2 molecules
Explanation:
I don't know how to explain it
The chemical formula of water is H₂O. Then 1 mole of water weighs 18 gram. Hence, 80 gram of water is equal to 4.4 mole.
What is chemical formula ?
Chemical element symbols, numbers, and occasionally other symbols like parentheses, dashes, brackets, commas, and plus and minus signs are used in a chemical formula to represent information about the chemical proportions of the atoms that make up a certain chemical compound or molecule.
It displays the constituent elements and how many atoms of each element are found in a single complex molecule. It also represents the compound's molecular weight.
Water has the chemical formula H₂O. Water weights 18 grams per mole. 80 grams of water are therefore equivalent to 4.4 moles.
Thus, The chemical formula of water is H₂O. 80 grams of H₂ contain 4.4 molecules of water.
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A reading before and after was taken from a burette, as shown.
What is the reading of the burette on the left, in mL? Do not type in units.
Im having a hard time reading the numbers on the left picture
Answer:
Reading on left looks like 1.4
Explanation:
what is the mass in grams of 9.3 moles of C2H4
Answer:
18.6 ( had to be 20 letter :/)
Explanation:
Whats the difference between an atom and an ion?
An atom is the fundamental unit of matter and it contains an equal number of protons and electrons in its nucleus which makes it electrically neutral. An ion however, is an atom containing an unequal number of protons and electrons which means it will either carry a net positive charge or negative charge depending on whether there are more electrons or protons.
Answer:
atoms are neutral or they have equal number of proton and electron but ions can be cation(positively charged) or anion(negatively charged) based on the number of electron the atom lose and gain respectively
What happens at the cathode in an electrolytic cell?
(Answer is reduction)
Answer:
At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.
Explanation:
Since positive ions pick up electrons at the negatively charged cathode, reduction takes place there.
What is reduction?The process of obtaining electrons or a decrease in an element's oxidation state in such a chemical reaction would be known as reduction, which is the movement of electrons among species. An increase in the number of electrons connected to a single or a collection of atoms is the result of a reduction chemical process.
What is electrons?The electron would be a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, have been typically regarded to be elementary particles.
In an electrolytic cell, the cathode is where ions in the neighboring medium could be converted into atoms, which then plate out or precipitated onto the solid cathode. Both oxidation and reduction occur at the anode but also cathode, respectively.
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What the answer giving brainliest:) HELP
Answer:
I think it's tornado
Explanation:
Answer: should be d. then
(sorry if im wrong)
:(
i feel so stupi.d
(i changed my answer to d.)
What are two dangers associated with
nuclear fission?
Answer:
Nuclear energy produces radioactive waste
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years
Explanation:
A hypothesis is a
a. concise statement of behavior that is always the same under the same conditions
b. set of quantitative data
C. tentative explanation or predication based upon experimental observations
d. well-tested unifying principle that explains a body of facts
e. mathematical formula that models a pattern of behavior
concise statement of behavior that is always the same under the same conditions
Answer:
the answer is c or d
Explanation:
you can cross out e because it dont make any sense
b thats just data
a is the definition of law
What is electronegativity
Answer:
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.
3.5x10^5 x 4.81x10^-3
Answer:
there u go
Explanation:
Two nitrogen atoms form a diatomic molecule. Which type of bond is most likely to be formed in the case of a diatomic nitrogen molecule?
A. Single Bond
B.Double Bond
C.Triple Bond
D.Ionic Bond
Explanation:
It's a triple bond for nitrogen,double bond for oxygen(just saying)
As a cognitive effect of consuming violent media, what may the appetite effect cause one to believe?
A. A person witnessing aggressive behavior thinks it is unusual and rare.
B. Those who witness violence in the media see the world as threatening.
C. Witnessing violent behavior in the media causes the desire for more violent media.
D. This exposure causes others to react aggressively to potential conflicts.
The appetite effect cause one to believe is those who witness violence in the media see the world as threatening.
What is an appetite effect?The appetite effect is used as a slang here, if someone is consuming violent media.
If someone is consuming violent media, then his appetite effect will be threatening from the world.
Thus, the correct option is B. Those who witness violence in the media see the world as threatening.
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Answer:
b
Explanation:
edge 2022
Sodium hydrogen carbonate, on heating, produces sodium carbonate, water and carbon dioxide.
A recipe for chocolate chip cookies requires 1.5 dm' of carbon dioxide.
Calculate the mass of sodium hydrogen carbonate that should be used at R.T.P.
INa = 23; H = 1: C = 12; O = 16.]
[Note that 1 mole of gas occupies a volume of 24,000 cm at room temperature and pressure (RTP)]
The mass of sodium hydrogen carbonate : 10.5 g
Further explanationGiven
1.5 dm' of CO₂
1 mol gas= 24 L at RTP(25 °C, 1 atm)
Required
the mass of sodium hydrogen carbonate
Solution
Decomposition reaction of Sodium hydrogen carbonate :
2 NaHCO₃ (s) ⇒ Na₂ CO₃ (s) + H₂ O(g) + CO₂ (g)
mol CO₂ :
[tex]\tt mol=\dfrac{1.5}{24}=0.0625[/tex]
From the equation, mol ratio of NaHCO₃ : CO₂ (g) = 2 : 1, so mol NaHCO₃ :
[tex]\tt 2\times 0.0625=0.125[/tex]
Mass NaHCO₃(MW=23+1+12+3.16=84 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.125\times 84\\\\mass=10.5[/tex]
True or False: Bromine is a gas at – 60 °C
Answer:
False
Explanation:
A. An atom loses one electron. What is the overall charge now?
Answer:
it losses one neutrons that is hydrogen
Draw a simple transverse wave and label the wavelength.draw it on a piece of paper
Answer:
I need this too but nobody knows how :(
Explanation:
What is the wavelength (in nm) of
blue light that has a frequency of
6.69 x 1014 s=?? (c = 3.00 x 108 m/s)
Answer:
λ = 0.45×10⁻⁶ m
Explanation:
Given data:
Wavelength of blue light = ?
Frequency of blue light = 6.69×10¹⁴ s⁻¹
Solution:
Formula;
Speed of wave = wavelength × frequency
Speed of wave = 3.00×10⁸ m/s
by putting vales,
3.00×10⁸ m/s = λ × 6.69×10¹⁴ s⁻¹
λ = 3.00×10⁸ m/s / 6.69×10¹⁴ s⁻¹
λ = 0.45×10⁻⁶ m
please help!!!!!!!
according to the laws of conservation of mass how much zinc was present in the zinc carbonate
a. 40 g
b. 88 g
C. 104 g
d. 256 g
