Answer:
1.30
Explanation:
The neutralization reaction involved in the titration is:
HClO₄(aq) + KOH(aq) → KClO₄(aq) + H₂O(l)
According to the chemical equation,
1 mol of HClO₄ reacts with 1 mol of KOH (1 equivalent of acid with 1 equivalent of base). The moles are calculated from the product of the molar concentration (M) and the volume in liters.
We have the following moles of acid (HClO₄):
40.0 mL x 1 L/1000 mL = 0.04 L 0.200 mol/L x 0.04 L = 8 x 10⁻³ moles HClO₄
Since HClO₄ is a strong acid (completely dissociated into H⁺ and ClO₄⁻ ions), the moles of HClO₄ are equal to the moles of H⁺.
Then, we can calculate the initial pH:[H⁺] = 0.200 M → pH = -log [H⁺] = -log (0.200) = 0.70
Now, we calculate the pH after the addition of KOH. Since KOH is a strong base, the concentration of KOH is equal to the concentration of OH⁻ ions.
a) 0.0 mLNo KOH is added, so the pH is the initial pH:
0.70
b) 80.0 mL KOH80.0 mL x 1 L/1000 mL = 0.08 L0.100 mol/L x 0.08 L = 8 x 10⁻³ moles KOH = 8 x 10⁻³ moles OH⁻
After neutralization we have: 8 x 10⁻³ moles H⁺ - 8 x 10⁻³ moles OH⁻ = 0The neutralization reaction is complete and there is no remaining H⁺ from the acid.
The concentration of H⁺ is equal to the concentration of H⁺ of water:
[H⁺] = 1 x 10⁻⁷ M → pH = -log [H⁺] = -log (1 x 10⁻⁷) = 7.0
c) 10.0 mL KOH10.0 mL x 1 L/1000 mL = 0.01 L0.100 mol/L x 0.01 L = 1 x 10⁻³ moles KOH = 1 x 10⁻³ moles OH⁻
After neutralization we have: 8 x 10⁻³ moles H⁺ - 1 x 10⁻³ moles OH⁻ = 7 x 10⁻³ moles H⁺
The total volume is:
V = 40.0 mL + 10.0 mL = 50 mL = 0.05 L[H⁺] = 7 x 10⁻³ moles/0.05 L = 0.14 → pH = -log [H⁺] = -log (0.14) = 0.85
d) 100.0 mL KOH100.0 mL x 1 L/1000 mL = 0.1 L0.100 mol/L x 0.1 L = 0.01 moles KOH = 1 x 10⁻² moles OH⁻
After neutralization we have:
1 x 10⁻² moles OH⁻ - 8 x 10⁻³ moles H⁺ = 2 x 10⁻³ moles OH⁻
The total volume is:
V = 40.0 mL + 100.0 mL = 140 mL = 0.14 L[OH⁻] = 2 x 10⁻³ moles/0.14 L = 0.014 → pOH = -log [OH⁻] = -log (0.014) = 1.84pH + pOH = 14 → pH = 14 - pOH = 14 - 1.84 = 12.15
e) 40.0 mL KOH40.0 mL x 1 L/1000 mL = 0.04 L0.100 mol/L x 0.04 L = 4 x 10⁻³ moles KOH = 4 x 10⁻³ moles OH⁻
After neutralization we have: 8 x 10⁻³ moles H⁺ - 4 x 10⁻³ moles OH⁻ = 4 x 10⁻³ moles H⁺
The total volume is:
V = 40.0 mL + 40.0 mL = 80.0 mL = 0.08 L[OH⁻] = 4 x 10⁻³ moles/0.08 L = 0.05 M → pH = -log [H⁺] = -log (0.05)
= 1.30
Highly permeable soil that is capable of storing water is called a(n)___________.
A. aquifer
B. water table
C. irrigated system
D. groundwater reserve
Answer:
The answer is A. Aquifer
Explanation:
It stores groundwater.
Bonding with intermolecular forces:
1.) is CH3CI a hydrogen bonding? yes or no?
2.) is CH3CI dipole-dipole interactions? Yes or no?
3.) is CH3CI a london dispersion forces? Yes or no?
Answer:
1. yes
2. yes
3. No
Hope this helps!!
A solution has a pOH of 2.40. Find out its pH
A solution has a pOH of 2.40. And it's pH is -11.6.
What is pH and how it calculated from pOH?It pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.In order to calculate the pOH, take the negative log of the hydroxide ion concentration. To find the pH, simply subtract pOH from 14.A solution has a pOH of 2.40. And it's pH is -11.6.
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If 500ml of H₂ gas at 600mmHg and 400ml of CO₂ gas at 700mmHg are mixed in a 1 lit vessel, find the total pressure of mixture of gases at constant temperature..
Answer:
Total pressure increased
Explanation:
When gas C is added in the vessel then number of mole increases and number of collision depends on the number of molecules present in the vessel and on adding gas C ,mole also increases hence number of collision increases therefore pressure also increases because number of collision increases.
Total pressure increases.
Use the following scenario to answer the question.Taj and Micah chose to go bowling. Taj rolled the ball toward the pins first, knocking them all down.Which of the following is affecting these objects?(1 point)Inertia is affecting these objects. Inertia is affecting these objects. A balanced force is affecting the objects.A balanced force is affecting the objects.An unbalanced force is affecting the objects. An unbalanced force is affecting the objects. Gravity is affecting these objects.
An unbalanced force is affecting the objects and is therefore denoted as option C in this scenario.
What are Unbalanced forces?These are the type of forces which cause an object on which it is acting to accelerate or change its position.
The unbalanced force is responsible for the movement of the ball and the pins being knocked down due to unequal forces on the same side.
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state three chemical properties of hydrochloric acid
Explanation:
Hcl is the one of the strongest acids as it disassociates almost everything. Its Chemical formula is HClIt has a unique pungent smell. it is commonly used in laboratories used for both in its aqueous and gaseous formHope it helps...
Answer:
H2o,hydrogen,carbonoxide
Arrange these elements according to atomic radius.
Largest radius
Smallest radius
Answer Bank
K
Ca
Mg
Be
Rb
Answer:
straight to the point:
Explanation:
atomic radius of :
k = 280 pm
Ca = 231 pm
Mg = 173 pm
Be = 153 pm
Rb = 248 pm
pm means "picometers".
so knowing this we will have :(largest to smallest),
k
Rb
Ca
Mg and
Be.
hope this helps .
Use logarithmic properties to solve the following equation log3 5x+ log3 7= 4 leave your answer in fraction form please
Explanation:
Adding logs of same base is equivalent to multiplying the arguments. You get:
[tex] log_{3}(35x) = 4[/tex]
Use the definition of the log to turn this into an exponential function:
[tex] {3}^{4} = 35x[/tex]
[tex]81 = 35x[/tex]
[tex]x = \frac{81}{35} [/tex]
What is the mass, in grams, of 5.90 mol C8H18?
[tex]\huge\mathbb{✒ANSWER}[/tex]
HI BRAINLY USER!!
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》Mass = 5.90 x 114 = 672.6g.This can be rounded to 673g
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#CARRY ON LEARNINGPlease I need the answer asap
The specific heat of water is 4.184 J/g·K. How much energy must be added to 100.0 g of water to raise the temperature of water from 22.0 ºC to 90.0 ºC?
a. 2.84 kJ
b. 136 J
c. 28.4 kJ
d. 6800 J
The energy needed to raise the temperature of water from 22.0ºC to 90.0ºC is c. 28.4 kJ.
What is specific heat?The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.
By the formula [tex]Q = mc\Delta T[/tex]
Q is the heat
m is the mass
c is the specific heat
Now, c = 4.184 J/g.K
The change in temperature is 22.0 ºC to 90.0 ºC
Putting the value in the equation
[tex]Q = 100 \times 4.184 \times (90.0 - 22.0)\\\\Q = 4.184 \times 68.0\\ \\Q= 284.5 \;J[/tex]
Thus, the energy needed to raise the temperature of water from 22.0ºC to 90.0ºC is 28.4 kJ
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The question is in the photo
The required moles of AgBr precipitate produced by given moles of silver nitrate is 0.0123.
How do we calculate moles from molarity?Molarity of any solution is define as the moles of solute present in per liter of the solution and it will be represented as:
M = n/V
Given that, molarity of AgNO₃ = 0.250M
Volume of AgNO₃ = 49.5mL = 0.0495L
Moles of AgNO₃ = (0.25)(0.0495) = 0.0123mol
Given chemical reaction is:
2AgNO₃(aq) + CaBr(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)
As it is mention that CaBr is present in excess quantity and AgNO₃ is the limiting reagent so the formation of precipitate will depend on the AgNO₃.
From the stoichiometry of the reaction, it is clear that:
2 moles of AgNO₃ = produces 2 moles of AgBr
0.0123 moles of AgNO₃ = produces 2/2×0.0123=0.0123 moles of AgBr
Hence 0.0123 is the required moles of precipitate.
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What happens if you ignite flint and steel around obsidian?
Answer:
Nothing.
Explanation:
Onsidians reaction point is 1,830'f.
The formula relating mass and weight is W=
Answer:
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg.
Explanation:
W=F=M x GThe measurement of the effect of gravity on an object's mass is called weight. While mass m is a measurement of the object's amount of matter. W=mg provides the weight.
What is the formula relating to mass and weight?The formula W (weight) = m (mass) times g (gravity, on Earth typically measured at 9.8 N/kg) allows you to determine something's weight from its mass and vice versa.
The common weight calculation formula is W = mg (N/kg). Here, "g" stands for the acceleration brought on by gravity. The value of g on earth is 9.8 m/s2. Other names for it include the gravitational constant.
A body's mass, which is a measurement of how much matter it contains, is equal to its weight when multiplied by the acceleration caused by gravity. The SI unit of weight is the Newton, and the SI unit of mass is the kilogramme (kg) (N).
Thus,The formula relating mass and weight is W=mg.
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How much energy is gained when a 10.0g sample of liquid water increases in temperature from 13°C to 18°C?
A 10.0 g-sample of liquid water absorbs 50 cal of energy when its temperature increases from 13 °C to 18 °C.
What is heat?Heat is a form of energy resulting from the difference in temperature between two bodies.
A sample of water initially at 13 °C, absorbs energy in the form of heat and its temperature increases to 18 °C.
We can calculate the amount of heat absorbed using the following expression.
Q = c × m × ΔT
Q = 1.0 cal/g°C × 10.0 g × (18 °C - 13 °C) = 50 cal
where,
Q is the heat absorbed.c is the specific heat of water.m is the mass of water.ΔT is the change in the temperature.A 10.0 g-sample of liquid water absorbs 50 cal of energy when its temperature increases from 13 °C to 18 °C.
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Explain why the ionic radii for S^-2 is larger than O^-2?
Answer:
When comparing two ions, gaining the same electrons, atomic radii, you can follow the same general rule as regular ionic radius.
Explanation:
In general, Sulfur has a larger atomic radius than Oxygen, as it is lower on the periodic table. Since they both are gaining the same amount of electrons, the trend still applies
How much energy is released when 2.72 kg of diethyl ether (C4H10O) freezes? The heat of fusion of diethyl ether is 7.27 kJ/ mol
Answer:
2672 kj
Explanation:
C4H10 O mole wt = 48 + 10 + 16 =~ 74 gm
27200 gm / 74 gm/mole = 367.57 moles
367.57 moles * 7.27 kj/mole =
What temperature is necessary for 50 g of Potassium Chlorate to dissolve in
100 g of water?
Answer:
75°C
Explanation:
Answer: 75°C because KCL at 75°C goes into 50g in Solubility in 100g water. TRUST ME ITS RIGHT.
Give an example of another metal
Answer:
Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.
Explanation: This is was makes a metal a metal: it needs to be:
high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
Prepare 100. ml of 0.1 N H2SO4 by diluting from original H2SO4.
Eq. wt. of H,SO4 = 98/2=49 .
d H2SO4= 1.08
Purity =98%
Density for 98% = 1.84 g/mL
V M = # mol
0.1 L x 1 M = 0.1 mol
0.1 mol x 98 g/mol = 9.8 g
m =%CDV
9.8 g = 0.98 x 1.84V
V = 5.43 mL
take this volume and carefully (acid to ater) dilute till 100 mL
5. How many grams of potassium bromide will dissolve in 450g of water at 80°C?
HELPPPPPPP A certain reaction is endothermic in the forward direction. The reaction has less moles of gas on the product side. Which of the following stresses would increase the yield of the products (shift right)? (5 points)
Group of answer choices
Increasing the pressure
Decreasing the temperature
Increasing the volume
Decreasing the reactant concentration
Answer: Option A
Explanation:
Increase in temperature will increase the yield of the product and cause a shift to the right.
What is an Endothermic reaction?
This is the type of reaction in which reactants absorb heat energy from the surroundings to form products.
This depicts that an increase in temperature will increase the yield of products thereby making option A the most appropriate choice.
Please help me!
Q1) heating materials
Q2) heat capacity specheat
8.5743 g of pure sample of Tmx(SO4)y produces2.6322 g of SO2. Determine the molecular formula and the name of the unknown thulium compound.
The name of the compound is thulium (iii) sulfate and it's molecular formula is:
[tex]Tm_2(SO_4)_3[/tex]
What is the molecular formula of the unknown compound?The molecular formula of a compound is the formula showing the ratio in which atoms of elements combine in 1 mole of the compound.
The oxidation state of thulium is +3 and the oxidation state of SO4 is +2.
By exchange of radicals, the molecular formula of the compound is as :
[tex]Tm_2(SO_4)_3[/tex]
The name of the compound is thulium (iii) sulfate.
Therefore, the compound is thulium (iii) sulfate.
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How many milliliters of this solution are required to prepare 1.00 L of 0.130 M K2Cr2O7 ?
Answer:
First you'll need to divide the mass of K2Cr2O7 by its molar mass and volume which should be easy but I'll do some of it to help you out
Explanation:
[tex]K_{2}Cr_{2}O_{7}[/tex]
[tex]2K = 39.098 = 2(39.098) = 78.196[/tex]
[tex]2Cr = 51.996 = 2(51.996) = 103.992[/tex]
and
[tex]7O = 15.999 = 7(15.999) = 111.993[/tex]
[tex]78.196 + 103.992 + 111.993 = 294.181[/tex]
so that's the mass of K2Cr2O7 and then you divide it by the molar mass and volume.
Hopefully you can do that on your own! Hope I helped a bit atleast and I have a good feeling about 0.438 but I don't want you to just guess
How many moles of NO2 will be produced from 15 moles of oxygen?
2 NO (g) + O2 (g) -------------> 2 NO2 (g)
Based on the mole ratio of the reaction, 30 moles of NO2 will be produced from 15 moles of oxygen.
What is mole ratio of a reaction?The mole ratio of a reaction is the ratio in which moles of reactants combine with themselves to form moles of products.
The equation of the reaction is given below:
[tex]2 NO (g) + O_2 (g) ---> 2 NO_2 (g)[/tex]
The mole ratio of NO2 to oxygen is 2 : 1
Molles of NO2 produced from 15 moles of O2 = 15 × 2 = 30 moles
Therefore, 30 moles of NO2 will be produced from 15 moles of oxygen.
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Why is the boiling of water a physical change if water changes from a liquid to a gas?
Answer:
because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
Explanation:
Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.
help pls
plspspslslslsl
Answer:
see below
Explanation:
K.E. = 1/2 * m * v^2
= 1/2 * 2 * 5^2 j
What type of weather front would be responsible for the following forecast: "a period of heavy rain within the next 24 hours followed by warmer temperatures. Thunderstorms and possibly thundershowers from the period of 24 to 30 hours from now with temperatures dropping by 20-25 degrees F and barometric pressure dropping by 15-20mb. Snow beginning 30-36 hours from now, accumulation of 10-13 inches possible. Cooler temperatures and clear skies in 2 days."
The kind of weather front that would be responsible for the forecast given above is:
"Cooler temperatures and clear skies in 2 days."
A weather front in Meteorology refers to the zone where transition occurs between two different air masses a the surface of the earth. That is, you have warm air (which usually results in low pressures, and of course rain) and cold air.
Warm air creates rain because a warm mass of air will hold moisture collected from a large geographical space. This air cools as it rises, then eventually transits into precipitation - rain.
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How are fusion and fission similar? Click the two answers that apply.
a
Both produce large amounts of energy.
b
Both occur in the stars.
c
Both are used to create electricity.
d
Both involve changes in the nucleus of atoms.
e
Both create radioactive waste.
Helium is a colourless, odorless used in bolloons. Calculate . the pressure Cin atm) exerted by 1.82 mous of gas in a steel vessel of volume 5.43 L at L 69.58°C
Answer:
9.59 atm
Explanation:
Use ideal gas law PV = n RT
V = 5.34 L n = 1.82 mole T = ( 69.58+ 273.15) = 342.73 K
R = .082057 L-Atm/(K - mole)
P = n RT / V = 9.59 Atm