pH is the concentration of the hydrogen ion in the solution. The value of Ka for hydrogen fluoride is 2.7688.
What is pH?pH is the potential of the hydrogen or the hydronium ion in the solution that depicts the acidic or the basic character of the solution.
Given,
pH = 2.3
Concentration of hydrogen fluoride = 0.25 M
The concentration of hydrogen ion is calculated as:
[tex]\begin{aligned} \rm pH & = \rm - log [H^{+}]\\\\2.3 &= \rm - log [H^{+}]\\\\&= 0.832\;\rm M\end{aligned}[/tex]
Ka is calculated as:
[tex]\begin{aligned} \rm Ka &= \rm \dfrac{[H^{+}]F^{-}]}{[HF]}\\\\&= \dfrac{0.832 \times 0.832}{0.25}\\\\&= 2.7688\end{aligned}[/tex]
Therefore, 2.7688 is the Ka for hydrogen fluoride.
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What is the concentration of cu2 in the other half-cell? (assume the concentration in the unknown cell to be the lower of the two concentrations. )
The concentration of the copper half cell with 0.22 V is [tex]\rm \bold{5.7\;\times\;10^{-11}\;M}[/tex].
What is half cell?In the electrochemical cell, the reduction and oxidation takes place in different electrodes, and thereby it is termed as half cell. The standard cell potential of the given cell is 0 V.
The reduction potential of one half cell cathode is considered to be given as 1.6 mM. The cell potential is 0.22 V.
The potential of the half cell is given as:
[tex]\rm E=E^\circ_{cell}-\dfrac{0.059}{n}\;log\dfrac{anode}{cathode}\\\\0.22\;V=0-\dfrac{0.059}{2}\;log\dfrac{anode}{1.6\;\times\;10^-^3\;M}\\\\Anode\;conc.=5.7\;\times\;10^{-11}\;M[/tex]
The concentration of the copper half cell with 0.22 V is [tex]\rm \bold{5.7\;\times\;10^{-11}\;M}[/tex].
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How many ml of 0. 10 m naoh should the student add to 20 ml of 0. 10 m hf or if she wished to prepare a buffer with a ph of 3. 55, the same as in problem 4
The required volume of 0.10M NaOH solution that student will add is 20 mL.
How do we calculate the volume?Volume of any solution which is required to prepare buffer will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of NaOH solution.M₂ & V₂ are the molarity and volume of HF solution.On putting values, we get
V₁ = (0.1)(20) / (0.1) = 20mL
Hence required volume of NaOH solution is 20mL.
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Which compound, on the basis of its name, has a carbon-carbon double bond?
chlorobutane
butene
butane
butyne
The compound that a carbon-carbon double bond is Butene.
AlkeneAlkene is a hydrocarbon containing at least a carbon–carbon double bond. Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.
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A gas has a volume of 72.1 liters at 58.3 atm. The final volume is 101.0L, what is the new pressure?
Answer:
X is an element in period 3 with two electrons in the outer shell
How many moles of solute are in 125 mL of a 2.0 M hydrochloric acid (HCI) solution?
if answer 1 point . plsss fast daddddy
[tex]\sf\large \green{\underbrace{\red{Answer⋆}}}:[/tex]
0.250 moles
Explanation:
First we will convert quantity of solution into liters
[tex] \implies \sf 125 \: ml \times {10}^{ - 3} = 0.125 \: l[/tex]
Now we will use morality formula
[tex] \sf molarity = \frac{no \: of \: moles}{volume} \\ \\ \sf no \: of \: moles = molarity \times volume[/tex]
Here volume(quantity) = 0.125 l
AND no. of moles(given) = 2.0M
[tex] \sf \implies no \: of \: moles = 2 \times 0.125 \\ \\ \sf \implies no \: of \: moles = 0.250 \: moles \: of \: HCl[/tex]
[tex]~~~~~~w = \dfrac{SVM}{1000}\\\\\\\implies nM = \dfrac{SVM}{1000}\\\\\\\implies n= \dfrac{SV}{1000}\\\\\\\implies n = \dfrac{125 ~ \text{mL}\times 2.0~ \text{M}}{1000}\\\\\\\implies n = \dfrac{250}{1000}\\\\\\\implies n = 0.25~ \text{mol.}\\\\\text{The number of moles is 0.25.}[/tex]
What is the pressure (in atm) in a 5. 00 l tank with 37. 50 grams of oxygen gas at 350 k?
The pressure (in atm) in a 5 L tank with 37.50 grams of oxygen gas at 350 K is 6.715 atm.
How do we calculate the pressure of gas?Pressure of gas will be calculated by using the ideal gas equation as:
PV = nRT, where
P = pressure = ?
V = volume = 5 L
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 350 K
n is the moles of gas and it will be calculated as:
n = W/M, where
W = given mass = 37.50 g
M = molar mass of oxygen = 32g/mol
n = 37.50/32 = 1.17 mol
On putting all these values, we get
P = (1.17)(0.082)(350) / (5) = 6.715 atm
Hence resultant pressure of the oxygen gas is 6.715 atm.
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What would be the properties of the 5th state of matter? (bosse-instein condensate)
Answer:
a state of matter created when particles, called bosons, are cooled to near absolute zero (-273.15 degrees Celsius, or -460 degrees Fahrenheit).
Explanation:
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A 1.0 g mixture of magnesium chloride and sodium nitrate is dissolved in water. then an excess of silver nitrate solution is added and a precipitate is collected and dried. the mass of the precipitate is 1.43 g. what is the percentage of magnesium chloride in the original mixture
The percentage of magnesium chloride in the original mixture is 25.529 %.
What is silver nitrate?Silver nitrate is an organic compound. It is used in treating wounds and infection of the skin.
A 1.0 g mixture of magnesium chloride and sodium nitrate.
The mass of the precipitate is 1.43 g.
Thus, the percentage of magnesium chloride in the original mixture is 25.529 %.
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is the earth getting hotter
rank the following pressures from highest to lowest a)736 mmHg b)0.928 atm c
)1.12*10^5 Pa d)728 torr
The rank of the pressure from highest to lowest are c, 1.22 x 10⁵ Pa < a, 736 mm hg < b, 0.928 < d, 728 torrs.
What is pressure?The force applied perpendicular to any object is the pressure.
First, we convert all the quantities into atm.
1. 1 mmHg = 0.00131579atm/mmHg
736mmHg = 0.96843 atm
2. 1 torr = 0.00131578947 atm/ torr
728 torr = 0.9579 atm
3. 1 pascal = 9.87 x 10⁻⁶
1.12 x 00000pa = 1.105 atm
So given value in atm are-a) 96843 atm b) 0.98atm c) 0.9579 aim d) 1105 atm.
SO, the order will be c<a< b<d.
Thus, the order will be c<a<b<d.
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A solution is made by dissolving 50. g of ethyl alcohol in 336 g of water. what is the percent by mass of ethyl alcohol in the solution? (round your answer to 2 sig figs)
Answer:
13 %
Explanation:
(50 g) / (50 + 336 g) = .1295 or 13 %
Question 1 (1 point)
The term insoluble refers to substances that readily dissolve
True
False
Question 2 (1 point)
Ionic solids will most likely dissolve in
a liquid water, which is a nonpolar solvent
b liquid water, which is a polar solvent
c liquid carbon tetrachloride, which is a nonpolar solvent
Question 3 (1 point)
Carbon dioxide gas is most soluble in water under conditions of
a high pressure and low temperature
b high pressure and high temperature
c low pressure and low temperature
d low pressure and high temperature
Question 4 (1 point)
The amount of a salt that will dissolve in a given volume of water depends primarily on the
a surface area of the salt crystals
b temperature of the water
c rate at which the salt and water are stirred
d pressure on the surface of the water
Question 5 (1 point)
The attraction between water molecules and an Na+ ion or a Cl– ion occurs because water molecules are
a linear
b symmetrical
c polar
d nonpolar
Answer:
Substances that dissolve most readily in water include ionic compounds and polar covalent compounds. aqueous solution. water that contains dissolved substances. solvent. the dissolving medium in a solution.
Explanation:
Which place has the best conditions for using solar energy?
A.
Somewhere with long days that is always cloudy
B.
A place that has long days with the sun out all day
C.
Somewhere with short days with the sun out all day
D.
A place that has short days and is mostly overcast
SEP math! Each day, the average person's
kidneys filter around 200 quarts of blood.
About 2 quarts of urine is produced in the
process. How many quarts of blood will the
average person's kidneys filter in one year?
How many quarts of urine will the average
Derson's kidneys produce in the same amount
of time?
Answer:
Quarts of blood = 72000
Quarts of urine = 720
Explanation:
Given;Each day, the average person'skidneys filter around 200 quarts of blood.About 2 quarts of urine is produced in theprocess. To Find;In one year the average person's kidney filter quarts of blood and quarts of urine.Here, we know that
1 year = 365 days
For blood
200 × 365 = 72000
For urine
2 × 365 = 720
Thus, The average person's kidney filters 72000 quarts of blood and 720 quarts of urine.
Question 1-6
What is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?
1. 0.029 molal
c. 0.11 molal
b. 29 molal
d. 1.1 x 10 4 molal
Answer:
Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent.
Tommy told the class that his science fair project proved that drinking three cans of soda each day will make you taller. Tommy explained that he measured his height at the beginning of the experiment and then drank three sodas each day for the next four weeks. At the end of the four weeks Tommy claimed he had grown 10 centimeters. What is needed to show that Tommy’s findings are valid?
his experiment being printed in a science journal
his procedure being reviewed by a group of his peers
his procedure being repeated with the same or similar outcome
his procedure read by scientists not involved in the experiment
Answer:
his procedure being repeated with the same or similar outcome
Explanation:
For findings to be valid, they must be reproducible. Thus, if others perform the same experiment and they get the same results, then soda might increase your height.
It's like if I claim that by saying bloody mary 3 times in mirror and I saw the ghost. For this to be valid, you and other need to do it and see if you do indeed see the ghost.
True or false. Wet objects allow electricity to pass through them easily
Answer:
true
Explanation:
Because water has a ability to flow electricity through it
What final product is formed when thorium-230 undergoes a series of two alpha (α) emissions?
The result of two alpha decay of Thorium 230 is Radon-222.
What is alpha decay?
The radioactive decay results in the release of the subatomic particles resulting in reduction in the mass number by 4, and the atomic number by 2.
The result of alpha decay of thorium 230 is given as:
First decay:[tex]\rm ^{230}_{90}Th\;\rightarrow\;^{226}_{88}Ra\;+\;^{4}_{2}\alpha[/tex]
Second decay:[tex]\rm ^{226}_{88}Ra\;\rightarrow\;^{222}_{86}Rn\;+\;^{4}_{2}\alpha[/tex]
The result of two alpha decay of Thorium 230 is Radon-222.
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The chemical formula for glucose (sugar) is C6H12O6. What are the individual numbers called in a chemical formula?
Subscript
Superscript
Coefficient
Exponent
The individual numbers which are present in chemical formula is subscript.
What is chemical formula?Chemical formula of any compound of chemistry consist more than one atoms in it and gives idea about the number of atoms present in that compound.
Given chemical formula of glucose is C₆H₁₂O₆.
In the given chemical formula of glucose, number which shows the amount of carbon, hydrogen and oxygen are known as subscripts.
Hence, individual number are subscript.
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[OH-] = 9.8 x 10^-11M
Is this acidic or basic?
Answer:
Acidic
Explanation:
pOH = - log (9.8 x 10^-11)
pOH = 10
pOH + pH = 14
pH = 14-10
pH = 4
Anything below pH of 7 is acidic.
Water waves in the sea are observed to have a wavelength of 300 m and a frequency of 0. 07 hz. The speed of these waves is:
The speed of water waves in the sea, which have wavelength 300 m is 21 m/s.
What is speed?
Speed is the distance travelled by an object in per unit time.
Given that, the wavelength of the waves is 300 m
The frequency of the waves is 0.07 hz
To find the speed
By the formula of speed
Speed = frequency × Wavelength
Putting the value in the equation
Speed = 300 × 0.07 = 21
Thus, the speed of these waves is 21 m/s
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Calculate the energy needed to vaporize 37.8 g of diethyl ether
The energy i.e. needed is 26.8 kJ of energy
The calculation is as follows:
the moles of diethyl ether is
= 1.01 moles
Since one mole of diethyl ether require heat = 26.8 kJ
Now the energy should be the same i.e. 26.8
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Water is an amphoteric substance, meaning it can serve as both an acid and a base,
True
False
Answer:
given statement is completely true
e.g . water H2O
Answer:
True
Explanation:
Water is amphoteric, which means it can act as both a Braonsted-Lowry acid and a Bronsted-Lowry base. Strong acids and bases ionize completely in aqueous solution, while weak acids and bases ionize only partially. The conjugate base of a Brønsted-Lowry acid is the species formed after an acid donates a proton.
Propose a reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 m ethyl 1 pentyne
A reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is proposed below.
What is synthesis reaction?The artificial execution of chemical reactions to obtain one or more products is known as chemical synthesis.
Physical and chemical manipulations, usually involving one or more reactions, are used to achieve this. The procedure is repeatable and reliable in current laboratory settings.Synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is shown in the image.
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If I have Oxygen gas at a pressure of 36.0 kPa, a volume of 38 L, and a temperature of 82 °C, how many moles of gas do I have? (Equation: K= 273+C),
PV=nRT
O 0.50 moles
O 0.40 moles
O 0.60 moles
O 0.46 moles
Answer:
.46 moles
Explanation:
PV = n RT make sure you use the correct R = 8.31446 L-kPa/(K-mol)
36 * 38 = n * 8.31446 * (273.15 + 82)
n = .463 moles
Can I get help in #5 ?
a. pressure increases
Gay Lussac's Law
When the volume constant, the gas pressure is proportional to its absolute temperature
[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]
Determine the molar concentration of cl- ions in a 1. 00 m solution of agcl2- with no excess silver ions
The molar concentration of Cl⁻ ions in a 1. 00 m solution of AgCl₂ with no excess silver ions is 0.020M.
How do we determine the molar concentration?Molar concentration of Chloride ions present in the silver chloride solution will be calculated by using the formation constant equation as:
Kf = [AgCl₂] / [Ag²⁺][Cl⁻]²
For AgCl₂ value of Kf is 2.5×10⁵.
Chemical reaction with ICE table is:
Ag²⁺(aq) + 2Cl⁻(aq) → AgCl₂
Initial: 0 0 1
Change: +x +2x -x
Equilibrium: x 2x 1-x
On putting all the values on the Kf equation, we get
2.5×10⁵ = (1-x) / (x)(2x)²
x is negligible as compared to 1 so the term 1-x becomes 1,
2.5×10⁵ = 1 / 4x³
x = 9.97 × 10⁻³ M
Concentration of chloride ions = 2x = 2(9.97 × 10⁻³) = 0.020M.
Hence the molar concentration of chloride ions is 0.020M.
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If I have 5.00g of solid CO₂ that is allowed to sublimate (turn to gas) in an empty balloon. How many moles of CO₂ are present in the balloon? If the gas has a temperature of 293. K at a pressure of 0.995 atm, what is the volume of the gas in the balloon?
56g is the coreect acsnw
Because it is a polar molecule, water has _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Answer: Cohesion
Explanation: Because cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another.
what is the specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0° C ?
Answer: 0.44
Explanation:
The specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C is 0.44J/g°C.
How to calculate specific heat capacity?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of the substancec = specific heat capacity∆T = change in temperature985 = 158.5 × c × (24°C - 10°C)
985 = 2219c
c = 985/2219
c = 0.44 J/g°C
Therefore, the specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C is 0.44J/g°C.
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