For a 21.2 mL sample of a 0.411 M aqueous hydrofluoric acid solution, the pH after 17.6 mL of barium hydroxide has been added is mathematically given as
pH=3.332
What is the pH after 17.6 mL of barium hydroxide has been added?Generally, the equation for the mole of HF is mathematically given as
mole of HF=molarity*volume
Therefore
mole of HF=0.361*19.2
mole of HF=6.931mmol
The chemical equation
HF+kOH⇆KF+H2O
Therefore
pH=pKa+log(Kf/HF)
pH=3.15+log(6.931*53.6/53.6*4.558)
pH=3.332
In conclusion, The pH
pH=3.332
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Example 2- If a weather balloon initially has a volume of 25000mL, but then rises up in the air and its new
pressure is 5atm, and its new volume is 15L, what was its initial pressure?
pressure
Binder
Answer:
3 ATM = INITIAL PRESSURE
Explanation:
P1V1 = P2V2
P1 * 25 = 5 * 15
P1 = 3 ATM
HELP PLS ASAP
how many liters of CO2 are produced when 32.6 liters of propane gas C3H8 reacts with excess oxygen at STP?
C3H8 + 5O2 > 4H2O + 3CO2
Your car breaks down. As your friends help
you puch it, it begins to move and speed
up.
try stopping putting the car in park before fixing
3. Arrange the following according to increasing acid strength
(i) Ka= 2.5 + 10-15
(ii) Ka= 9.0 + 10-9
(iii) pKa= 7.5
(iv) % dissociation =100
(a) iv, iii, ii, i
(b) ii, I, iii, iv
(c) i, iii, iv, ii
(d) i, ii, iii, iv
(e) iii, iv, ii, i
Answer:
3. Arrange the following according to increasing acid strength (i) Ka=2.5x 10-10 (ii) Ka=9.0x108 (iii)pKa= 7.5 (iv)% dissociation -100 (a) iv, iii, ii, i (b) ii, 1, iii, iv (c) i, iii, iv, ii (d)i, ii, iii, iv (e) iii, iv, ii, i
5. Consider the buffer NH/NH.Cl. If one wants to prepare 250.0mL of this buffer at pH 4.0. Is it possible to achieve one's sim? (a) yes (b) no 6. If the pH of the buffer in (5) above would be 9.0, the ratio of NH/NH.Cl required for the preparation, considering I Liter of buffer, is (a) 1.80 (b) 0.56 (c) 4.26 (d) 1.82 x 10: (e) K, (NH -1.8x109)
Explanation:
can u help me with this
Answer:
c
Explanation:
the reason is because your a homosiejenenddj
Write an equation that represents the action in water of hypoiodous acid ( HOI ) as a Brønsted–Lowry acid.
Taking into account the Brønsted-Lowry acid-base theory, the reaction between hypoiodous acid and water is:
HOI + H₂O ⇄ OI⁻ + H₃O⁺
Brønsted-Lowry acid-base theoryThe Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.
According to this theory, acids are proton donors while bases are proton acceptors. That is, an acid is a species that donates an H⁺ proton while a base is a chemical species that accepts an H⁺ proton from the acid.
So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.
Reaction between hypoiodous acid and waterIn this case, the reaction between hypoiodous acid and water is:
HOI + H₂O ⇄ OI⁻ + H₃O⁺
where HOI acts as an acid because it donates a potron, while water acts as a base because it accepts the proton donated by HOI.
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A student is investigating the affect of different salts on melting points. Four patches of ice of equal size are roped off and a different type of salt is poured on each, one receives table salt (NaCl), one receives Calcium Chloride (CaCl2), one receives Potassium Carbonate (KCO3) and the fourth receives inert sand instead. Each patch receives an equal amount of salt or sand. What could the student investigate?
A. The air temperature near each ice patch.
B. How quickly the ice patches melt.
C. Amount of sand absorbed.
D. The amount of oxygen released as each ice patch melts.
Answer:
B
Explanation:
By finding how quickly the ice pathes melt you are able to tell how well the salt dissolves in water (ice is the solid form of H2O). Different types of salts will melt the ice at different speeds.
This is also the only answer choice that correlates with melting points so :)
2.0 L of Carbon dioxide is heated from -25.0 °C to Standard Temperature.
What is the final volume of the gas?
The final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L.
How to calculate volume?The volume of a given gas can be calculated using the Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperatureV1 = 2LV2 = ?T1 = -25°C + 273 = 248KT2 = 273K2/248 = V2/273
273 × 2 = 248V2
546 = 248V2
V2 = 546/248
V2 = 2.2L
Therefore, the final volume of the gas that was heated from -25.0 °C to standard temperature is 2.2L
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Identify the false statement from the following.
A. London dispersion forces exist in all polar molecules.
B. Temporary charge imbalances in the molecules lead to London dispersion forces.
C. Hydrogen bond is type of dipole – dipole interaction.
D. London dispersion is the weakest among the intermolecular forces.
The false statement from the above is that: Temporary charge imbalances in the molecules lead to London dispersion forces.
What are the factors that affect London dispersion forces?Generally, the factors which affects the London dispersion forces a dispersion force are as follows:
Shape of the moleculesDistance between moleculesPolarizability of the moleculesHowever, London dispersion forces simply refers to a sort of temporary attractive force formed when electrons in two adjacent atoms occupy positions that make the atoms form dipoles.
So therefore, temporary charge imbalances in the molecules lead to London dispersion forces is a false statement
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What state of matter has the most kinetic energy?
A gas
B liquid
C solid
Answer:
gaseous state.
Explanation:
that's the answer
what is the pH of a solution that has a [H+]=1.75x10^-11
[tex]pH = - \log[\text{H}^{+}] = -\log \left(1.75 \times 10^{-11} \right) = 10.757[/tex]
Identify the molecule with the highest boiling point. A(.C 6H 6 B(. NH 3 C(. OF 2 D(. CHCl 3
Answer:
C6H6
Explanation:
benzene (C6H6) is 80.1°C. ammonia (NH3) is -33.3°Coxygen difluoride (OF2) is -144.7°C.chloroform (CHCI 3) is 61.2°C.A science teacher asked her students to calculate the density of a toy cube. The mass of the cube was 120 grams and the height of the cube was 4 centimeters.
What was the density of the cube in cubic centimeters? (**At least 2 decimal places)
Explanation:
density=> ro=m/V
m=0,12kg
V=0,04m³=6,4.10^-5
=>0,12/6,4.10^-5=1875 kg/m³
The wet adiabatic lapse rate (or saturated adiabatic lapse rate) varies with temperature, is 0.5°C/100 m (5°C/km or 3.3°F/1,000 ft), and happens when the air is completely __________ with water vapor at its dew point.
This happens when the air is completely Saturated with water vapor at its dew point
What is wet adiabatic lapse rate ?Wet adiabatic lapse rate is the rate at which a saturated wet air cools down with increase in altitude through an adiabatic process. This is process is also known as saturated adiabatic lapse rate.
Hence we can conclude that This happens when the air is completely Saturated with water vapor at its dew point.
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Answer: saturated
Explanation:
- If you have bottle filled with Sulfur Hexafluoride and there are 1.00 L of the liquid with a density of 1.60 g/mL, how many moles of the liquid are present?
Answer:
About 11.0 moles.
Explanation:
We are given a bottle filled with 1.00 L of sulfur hexafluoride (SF₆) and we want to determine the number of moles of the liquid that is present.
First, determine its mass with the given density:
[tex]\displaystyle \begin{aligned}\rho & = \frac{m}{V} \\ \\ m & = \rho V \\ \\ & = \left(\frac{1.60\text{ g}}{\text{mL}}\right)(1.00\text{ L})\left(\frac{1000\text{ mL}}{1\text{ L}}\right) \\ \\ & = 1.60\times 10^3 \text{ g}\end{aligned}[/tex]
The molecular weight of SF₆ is 146.07 g/mol. Hence:
[tex]\displaystyle 1.60\times 10^3\text{ g SF$_6$} \cdot \frac{1\text{ mol SF$_6$}}{146.07\text{ g SF$_6$}} = 11.0\text{ mol SF$_6$}[/tex]
Therefore, about 11.0 moles of sulfur hexafluoride is present.
i need help
please help by looking at the link
Answer:
the image is not clear....
match the following
Answer:
1 FOSSIL FUEL WITH A2 COMBUSTION WITH D3 PETROL WITH C4 GOBAR GAS WITH E5 FIRE EXTINGUISHER WITH B
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
........................
Answer:
no questions
it's just all dots here
what does SPDF Blocks represent on the periodic table?
Answer:
SPDF blocks represents the last electron of particular element entering into valance subshell.
example: oxygen is p block element because (1s2, 2s2 2p4) its last electron is in p block
A block of the periodic table is unified by the atomic orbitals in which valence electrons lie in.
What is the block in the periodic table?A block can be described as a set of elements in which the valence electrons lie in atomic orbitals. Each block in the periodic table is named after its characteristic orbital: s-block, p-block, d-block, and f-block.
The block names (s, p, d, and f) are derived from the value of an electron's azimuthal quantum number: sharp (0), principal (1), diffuse (2), and fundamental (3).
The s-block, where 's' stands for "sharp" and azimuthal quantum number 0, is on the left side of the periodic table. The p-block, where 'p' stands for "principal" and azimuthal quantum number 1, is on the right side of the modern periodic table and elements in groups 13 to 18.
The d-block, where 'd' stands for "diffuse" and azimuthal quantum number 2, is in the middle of the periodic table and elements from groups 3 to 12.
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This is my question
Answer:
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refer the three attached images for the respective answers.
hope helpful ~
How many moles of gas are present in the sample of gas occupies that 4.32 L at 1.45 atm pressure and -18oC? (Include your formula used and the set-up.)
The amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
Ideal Gas LawThe Ideal gas law states "that pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature of gas. It is expressed;
[tex]PV = nRT[/tex]
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant( [tex]R = 0.08206 Latm/molK[/tex]
Given the data in the question;
Volume; [tex]V = 4.32L[/tex]
Pressure; [tex]P = 1.45atm[/tex]
Temperature; [tex]T = -18^oC = 255.15K[/tex]
Amount of gas; [tex]n =\ ?[/tex]
To determine the moles of gas, we substitute our given values into the expression above.
[tex]PV = nRT\\\\1.45atm * 4.32L = n * 0.08206Latm/molK * 255.15K\\\\6.264Latm = n * 20.937609Latm/mol\\\\n = \frac{6.264Latm}{20.937609Latm/mol} \\\\n = 0.3mol[/tex]
Therefore, the amount of gas present in the sample which occupied the given volume at the given pressure and temperature is 0.3mol.
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Which of the following conditions would lead to a small population size? a. a low birth to death ratio b. a high birth to death ratio c. immigration d. large number of resources Please select the best answer from the choices provided A B C D Mark this and return
Answer:
Choice A.
A low birth to death ratio
Explanation:
A low birth to death ratio means that people are dying faster than they are being born. This leads to a decreasing population size.
Answer:
It's A
Explanation:
A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize. What was the molarity of the hydrochloric acid (M)? (Start by writing and balancing the reaction.)
A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize, then the molarity of HCl is 0.471 M.
How do we calculate molarity?Molarity will be calculated by using the below equation as:
M = n/V, where
V = volume of solvent
n is the moles of solute and it will be calculated by using the below equation:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Moles of Ca(OH)₂ = 0.506g / 74.093g/mol = 0.0068 mol
From the stoichiometry of the reaction:
0.0068 moles of Ca(OH)₂ = reacts with 2×0.0068 = 0.0136 moles of HCl
Given volume of HCl = 28.85mL = 0.02885 L
On putting values on the molarity equation, we get
M = 0.0136 / 0.02885 = 0.471 M
Hence required molarity of HCl is 0.471 M.
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what can you say about the acceleration when the pressure decreases from left to right
When the pressure decreases from left to right, the acceleration also decreases.
What is Acceleration?This is defined as the rate at which velocity changes with time and it has a direct relationship with pressure.
This however means that when pressure decreases there will be a corresponding decrease in acceleration and vice versa.
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Write a balanced equation for the precipitation reaction that was used to separate Ba2+ from Ca2+ and Mg2+.
Answer:
[tex]{\rm Ba^{2+}} \, (aq) + {\rm {SO_4}^{2-}}\, (aq) \to {\rm BaSO_{4}}\, (s)[/tex].
Explanation:
Make use of the fact that calcium sulfate [tex]{\rm CaSO_{4}}[/tex] and magnesium sulfate [tex]{\rm MgSO_{4}}[/tex] are much more soluble in water than barium sulfate [tex]{\rm BaSO_{4}}[/tex].
When sulfate ions [tex]{\rm {SO_{4}}^{2-}}[/tex] are added to dilute solutions containing [tex]{\rm Ba^{2+}}\, (aq)[/tex], [tex]{\rm Ca^{2+}}\, (aq)[/tex], and [tex]{\rm Mg^{2+}}\, (aq)[/tex], precipitation would be visible only in the solution with [tex]{\rm Ba^{2+}}\, (aq)\![/tex]. Barium sulfate would be the precipitate.
[tex]{\rm Ba^{2+}} \, (aq) + {\rm {SO_4}^{2-}}\, (aq) \to {\rm BaSO_{4}}\, (s)[/tex].
This ionic equation is balanced as it conserves both the atoms and the charges on the ions.
What is required in addition to oxygen to create a high
temperature flame?
Answer:
Oxygen enrichment of combustion air to increase flame temperatures by reducing the proportion of nitrogen used in the combustion process is of particular value to operators of high-temperature furnaces.
what would you expect to happen if you put a red blood cell in a glass pure water distilled water g
A sample 0.5 mole sample of NO2 gas occupies a 0.620 L container at 25 °C. What is the pressure of this gas?
The pressure of the sample of the gas in the container at 25 °C occupying 0.62 L is 19.73 atm
Data obtained from the question Volume (V) = 0.62 L Temperature (T) = 25 °C = 25 + 273 = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) = 0.5 mole Pressure (P) = ?Using the ideal gas equation, the pressure of the gas can be obtained as follow:
PV = nRT
Divide both side by V
P = nRT / V
P = (0.5 × 0.0821 × 298) / 0.62
P = 19.73 atm
Thus, the pressure of the gas is 19.73 atm
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What is the numbers of molecules for 65.8g of CO2?
Answer:
One gram of carbon dioxide contains 13.6 x 10²¹ number of molecules.
Explanation:
Answer:
1.50 moles
Explanation:
use dinemential analysis
find the molar mass
How are Jupiter, Saturn, and Uranus similiar? How are Jupiter, Saturn, and Uranus similiar?
Question 5 options:
a They are all large, gaseous planetary bodies.
b They are all planets that are the exact same size.
c They are all the same distance from the sun.
d They all have the exact same surface temperature.
Answer:
a
Explanation:
because they all are gasses
