For a buffer that was prepared contain 0.50 M formic acid (HCOOH) and 0.50 M sodium formate (NaCOOH). the pH is mathematically given as
pH=3.95
What is the pH after 0.010 mol of NaOH(s) is added to 100.0 mL of the buffer?Generally, the equation for the Hendersons equation is mathematically given as
pH=pKa+log(SALT)/(ACID)
Where
moles of (NaCOOH)=100*0.05/1000
moles of (NaCOOH)=0.05moles
and formic acid
moles of formic acid=100*0.05/1000
moles of formic acid=0.05moles
Therefore
pKa=-logka
pKa=1.4*10*3.77
pH=3.77+log{0.06/0.04}
pH=3.95
In conclusion, the pH is
pH=3.95
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Find the grams in 6.25 moles of HC2H302.
use this formula m=n×M
Your n would be 6.25mols
Your Molar mass would be the number you get after adding the molar mass of your equation: HC2H302. Find your periodic table and look there.
And you plug in the molar number in the formula and you multiply n×M
I would help but I don't have the periodic table with me right now
Question
How does physical states of a pharmaceutical dosage
form
(Solid,liquid or gas) influence the overall stability and
Storage of the formulated pharmaceutical
product
Answer:
it,s is so many people do you want to go then
you are not study then stage change of it
Complete the balanced dissociation equation , help please!
Answer:
Al3Br1 -> Al1Br3
Explanation:
I believe you just swap it but I’m not 100%
Help me please, Im giving brainliest answer.
Answer:
Sodium nitride is exothermic reaction and hydrochloric acid is endothermic reaction.
I2 is produced by the reaction of 0.4235 mol of CuCl2 according to the following equation: 2CuCl2+4KI⟶2CuI+4KCl+I2. What volume of I2 gas is produced at STP?
Answer: 4.7432 L
Explanation:
Use stoichiometry: .4235 mol CuCl2 (1 mol I2 / 2 mol CuCl2)(22.4 L / 1 mol I2) = 4.7432 L :)
SO2 + H2O +_ H2SO3
I need to know how to balance simple direct combination reactions
1. The molecule of Aspirin C_{9}*H_{8} * O_{4} contains 9C atomsatoms, and 4 Oxygen atomsHow are we using the molecular formula to write a conversion factor and use them in the calculation of the weight of compounds ?
The mass can be obtained from the molar mass when the number of moles is known.
What is molecular formular?The molecular formlar is the formula of the compound that shows the number of atoms of each element that is present in the molecule. Asprin is a moecule that has the molecular formula C9H8O4.
To use the molecular formula to determine weight, we have to know the number of moles involved.
Mass = number of moles * molar mass.
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How many moles of sodium hydrogen carbonate are present in 2.61 grams of this compound?
Molar mass of NaHCO_3
23+1+12+3(16)36+4884g/molNow
[tex]\\ \sf\longrightarrow No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \sf\longrightarrow No\:of\; moles=\dfrac{2.61}{84}[/tex]
[tex]\\ \sf\longrightarrow No\:of\:moles=0.0312mol[/tex]
(2) 8.1.3 Write down the structural formula of alcohol used in this reaction.
Answer:
-OH
Explanation:
Alcohols generally have the structural formula OH
for example, ethanols structural formula is C2H5OH
Which of the following molecules contains a covalent bond?
Answer:
m
Explanation:
Answer:
CN is your answer.
Explanation:
Hope this helps!!!
I need help. Thank you
Based on the fgiven K_{a} values of the acids, the equilibrim concentrations of[tex]HC_{2}H_{2}O_{2}[/tex] and [tex]NH_{4}^{+}[/tex] is dtermined using ICE tables.
What are acid dissociatio constants [tex]K_{a}[/tex]?An acid dissociation constant, [tex]K_{a}[/tex] of an acid is a measure of the strength of the acid in solution. The larger the [tex]K_{a}[/tex] value of an acid, the stronger the acid, therefore, acid dissociation constants are usually apply to only weak acids because strong acids have exceedingly large [tex]K_{a}[/tex] values.
It is written as a qoutient of the equilibrium concentrations of the aqueous species in the acid solution.
[tex]K_{a} = \frac{[H^{+}] [A^-{}]}{HA}[/tex]For the weak acids such as [tex]HC_{2}H_{2}O_{2}[/tex] and [tex]NH_{4}^{+}[/tex], their equilibrim concentrations are determined using their [tex]K_{a}[/tex] values and an ICE table.
The pH of solutions are estimated using indicators such as methyl orange, methyl red and phenolphthalein. The colors of indicators change according to the pH of the solution
Acidic solutions have pH less than 7 while alkaline solutions have pH greater than 7.
Therefore, acids have low pH and weak acids have low [tex]K_{a}[/tex] values.
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Please help me
Phylum ___________ contains organisms that have a cutic|e; a f|exible protective covering.
Answer:
B Nematoda
Explanation:
Which is true of magnetic fields?
A.
They are strongest at each pole, where the field lines are closest together.
B.
They are strongest at the north pole, where the field lines are closest together.
C.
They are strongest at the center of the magnet, where the field lines are farthest apart.
D.
They are strongest at each pole, where the field lines are farthest apart.
Magnetic lines of force are are strongest at each pole, where the field lines are closest together.
What are magnetic fields?A magnetic field is the region around a magnet where the influence of the magnet can be felt. The magnetic line of force show the intensity as well as the direction of the magnetic field.
The fact that is true for all magnetic fields is that they are strongest at each pole, where the field lines are closest together.
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Calculate the number of moles in 625mL of a 3.0 M NaOH solution
If 30 grams of KCl is dissolved at 10°C, how many additional grams would be needed to make the solution saturated at 60°C? * Captionless Image 45g 20g 15g 75g
If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.
What is a saturated solution?A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve. Its concentration is the same as the solubility at that temperature.
Step 1. Calculate the mass of water.At 10 °C, the solubility is 31.2 g KCl/100 g H₂O.
30 g KCl × 100 g H₂O/31.2 g KCl = 96 g H₂O
Step 2. Calculate the mass of KCl required to prepare a saturated solution at 60 °C.At 60 °C, the solubility is 45.8 g KCl/100 g H₂O.
96 g H₂O × 45.8 g KCl/100 g H₂O = 44 g KCl
Step 3. Calculate the mass of KCl that must be added.44 g - 30 g = 14 g
If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.
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Fe(NO3)3
Percent composition
Answer:
Fe: 23.1%
N: 17.4%
O: 59.5%
Explanation:
You take the grams that each weigh on the periodic table and add it all up. Afterward you create fractions of each over the whole. (Example: Fe/Fe+N+O) then you divide and turn that decimal into a percentage.
Where are the most greenhouse gases generated during the production of electricity?
Answer: city w
Explanation:
cities w,y,z all use renewable energy (sun, water, wind) which offput any greenhouse emmissions,
city w uses coal which produces greenhouse gases when used (burnt).
hope this helped! ♡
Balance the following equation. (20 pts)
Answer:
2Cl (aq) + Pb (aq) -> PbCl² (s)
Explanation:
What is the measurement of 2 polar bears
Answer:
An adult male is between 2.4-3m (8-10 feet) in size and weighs between 350-680kg (775-1500lbs). Females are slightly smaller at around 1.8-2.4m (6-8 feet) and weigh between 150-250kg (330-550lbs).
how can the ph of antiacid table de determine in laboratory
Answer:
Antacids are bases that react stoichiometrically with acid. The number of moles of acid that can be neutralized by a single tablet of a commercial antacid will be determined by back titration.
Correct me if i'm wrong, Hope This helps
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______ contributes to the nitrogen cycle by removing nitrogen from the air and converting it into a form that is usable by plants.
A. earthworms
B. bacteria
C. fungi
D. plants
Answer:
bacteria
Explanation:
Bacteria removes nitrogen from the air and converts it into a form that is usable by plants.
Answer:
Bacteria
Explanation:
I took the test and got it right
A patient who is scheduled for an x-ray expresses concerns about being exposed to radiation because he witnessed the effects of radiation on his father, who died of cancer. How should the dental assistant respond to this patient’s concerns?
The dental assistant should respond to this patient’s concerns by telling him that the amount of x-ray is very minimal and can't cause any negative effect.
What is X-ray?This is a penetrating form of electromagnetic radiation which produces images of the structures inside your body.
Exposure to large amounts of radiation could increase risk of cancer which is why minimal amounts which is safe is adopted.
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Which of the following is the primary use of land in the United States?
Question 1 options:
Pasture/range
Forest
Cropland
Urban
Answer:
pasture/range
Explanation:
this is because more than 1/3 of the country's land is being used for this mean alone.
Answer: Forest
Explanation: The largest percentage of land use in the United States is for forests.
How would Bohr model show the protons in a carbon atom
Answer:
The Bohr model show the protons in a carbon atom using the model; "Electrons move in fixed orbits around a nucleus of protons and neutrons."
According to Bohr's model of the atoms, the Rutherford model is basically correct. This implies that Bohr model accepts the idea of a nucleus containing nucleons(protons and neutrons).
In addition, the model also postulates that electrons are found in fixed orbits. These fixed orbits are called energy levels or shells.
A graphic description of this is shown in the image attached to this answer.
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Explanation:
Which statement is true of all proteins? (1 point)
They are created by mutations in DNA.
They carry oxygen in human blood.
Their main function is to cause mutations.
Their structure is related to their function.
Answer:
Their structure is related to their function.
Explanation:
Protein structure is related to their function. Therefore, the correct option is option D among all the given options.
What is protein?Proteins are huge biomolecular and macromolecular structures made up of one or even more long amino acid residue chains. Proteins serve a wide range of roles inside animals, including catalyzing metabolic events, DNA replication, reacting to stimuli, provides support to organisms and cells including transporting chemicals.
Proteins differ largely in their amino acid sequence, which is determined by the genetic code from their genes and generally culminates with protein folding into such a particular 3D structure that dictates its function. Protein structure is related to their function.
Therefore, the correct option is option D.
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what are the states of matter for the following equation?
6Br⁻ + XeO₃ + 6H⁺ → 3Br₂ + Xe + 3H₂O
Answer:
Explanation:
On the reactant side, XeO3 is a strong oxidizing agent. It can be a solid or gas. Most likely it is in a solid state.
H+ and Br- combine to form HBr which is a weak acid. So H+ and Br- are in an aqueous state.
On the product side, both Br2 and Xe are not very soluble in water. They will be in gaseous state and H2O is water i.e. liquid state.
What is the correct formula that would
result from the combination of the two
ionic species?
K1+ and Cro 2-
Answer:
A
Explanation:
Is not my personal answer, but here is what I found.
"This entity has been manually annotated by the ChEBI Team. Potassium chromate is the inorganic compound with the formula (K2CrO4). This yellow solid is the potassium salt of the chromate anion"
Assume you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution. How would this affect the reaction rate?
The reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.
What happen when the vitamin C is added in lower amount?If you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution, the reaction rate is affected because of the lower amount of reactant for the chemical reaction. If the reactants are present in larger amount then the products are also produced in large concentration.
So we can conclude that the reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.
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Which compound is an alcohol?
CH3Br
CH4
CH3COCH3
CH3CH2OH
Answer:
[tex]ch3ch2oh \: is \: alcohol \\ because \: it \: havve \: an \: oh \: grp \: \\ thank \: you[/tex]
How many grams are in 1.23 x 1020 atoms of arsenic?
Given the data from the question, the mass of arsenic that contains 1.23×10²⁰ atoms is 0.0153 g
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of arsenic
But
1 mole of arsenic = 75 g
Thus, we can say that:
6.02×10²³ atoms = 75 g of arsenic
How to determine the mass that contains 1.23×10²⁰ atoms6.02×10²³ atoms = 75 g of arsenic
Therefore,
1.23×10²⁰ atoms = (1.23×10²⁰ × 75) / 6.02×10²³ atoms)
1.23×10²⁰ atoms = 0.0153 g of arsenic
Thus, 1.23×10²⁰ atoms is present in 0.0153 g of arsenic
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