The pH can be defined as the measure of the acidity or the basicity of the solution. The ratio of hydrogen ion concentration and hydroxide ion concentration at pH 7 is 1.
What is hydrogen ion concentration?The hydrogen ion concentration can be given as the amount of hydrogen percent in the sample solution.
The pH has been the negative logarithmic value measurement of the hydrogen ion in the sample. The sum of the hydrogen ion and the hydroxide ion in the sample has been a constant 14.
[tex]\rm pH+pOH=14[/tex]
The pH can be given as:
[tex]\rm pH=-log[H^+][/tex]
At pH 7 neutral pH the concentration of Hydrogen ion and hydroxide are equal i.e.
[tex]\rm 7=-log[H^+]\\H^+=10^{-7}\;M[/tex]
The hydroxide ion concentration has been given as:
[tex]\rm pOH=-log[OH^-]\\7=-log[OH^-]\\OH^-=10^{-7}\;M[/tex]
The concentration of hydrogen and hydroxide are equal at pH 7. Thus, the ratio of the concentration has been 1.
This states the sample to be neutral.
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What mass of kcl is required to make 52 ml of a 0. 24 m kcl solution? report your answer to three places past the decimal point.
Answer:
Explanation:
La molaridad son los moles que hay por litro de solución.
En este caso tenemos 0,24 moles de KCL por 1000 ml de solución. El problema nos plantea que hay que preparar una solución de 54ml para poder sacar los moles hacemos una regla de tres.
1000 ml -----------0,24mol
54ml----------------X=(54ml*0,24mol)/1000ml
moles necesarios=0.0129 moles de KCl
Ahora para expresarlo en gramos utilizaremos la masa molar del compuesto, esto se hace buscando en la tabla periódica cada componente del compuesto y sumarlos.
En este caso tenemos el potasio (K) con una masa molar de 39 y el cloro (Cl) de 35,45 gramos lo
masa KCL=35,45+39=74,45 Gramos/mol
como tenemos 0.0129 moles haremos otra vez una regla de 3
1mol----------74,45 gramos
0.0129 mol-----0,960 gramos
espero que te sirva la respuesta! no te olvides de calificar :)
Mass can be calculated by using moles which can be further calculated from multiplication of Molarity to volume. The mass of KCl to make this solution is 0.960gram.
What is molarity?
Molarity can be calculated by dividing number of moles of solute by volume of solution in liter. Molarity is affected by temperature. Its unit is mole/litre. It measure the concentration of any solute in a solution.
Other concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution.
Mathematically,
Molarity= number of moles of solute/volume of solution in litre
Where,
moles= given weight ÷ molecular weight
= w/ 74.55
Substituting values in equation 1
0. 24=(w/ 74.55 )/(52/1000)
w=0.960gram
Thus the mass of KCl is 0.960gram.
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A compound is known to have a molar mass of 391.5 g/mol. Find the molecular formula of the compound, given the results of an analysis of a 310.8-g sample that revealed that the sample contains only boron and iodine. The mass of the iodine in the sample is found to be 302.2 g
Going by the result of the analysis as stated in the illustration, the molecular formula of the compound will be [tex]BI_3[/tex]
Molecular formulaMolecular formula = n[empirical formula]
Where n = molar mass/empirical mass
Empirical formula
B = 8.6/10.8
= 0.8
I = 302.2/126.9
= 2.38
Dividing by the smallest:
B = 0.8/0.8 = 1
I = 2.38/0.8 = 3
Empirical formula = [tex]BI_3[/tex]
Empirical formula mass = 10.811 + 126.9x3
= 391.5
n = 391.5/391.5 = 1
Thus, the molecular formula of the compound = empirical formula = [tex]BI_3[/tex]
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I got more(science)please help I’m to lazy-
Answer:
D :DDDDDDDDDDD
Flourine atom. Drag a valence electron from the left atom to the right atom. What happens?
Why is glass useful for making eyeglasses
Answer:
because it's the glass that goes on eyeglasses
Answer:
Because it is transparent
the current in the first circuit is 0.4 A. A second identical bulb is added in series. What will the current in the second circuit be?
pls answer quickly as possible i have an examination tomorrow so I am preparing for the tests
thanks
The current in the second circuit in series with the first circuit is 0.4 A.
Current in series circuit
The current flowing in series circuit is the same across all the component of the circuit.
The total voltage drop in a series circuit is given as;
V = IR₁ + IR₂ + IR₃
V = I(R₁ + R₂ + R₃)
If the current in first circuit is 0.4 A, when second identical bulb is added in series, the current in the second circuit will be 0.4 A.
Thus, the current in the second circuit in series with the first circuit is 0.4 A.
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in this image of a volcano, which letter represents lava
Answer:
d
Explanation:
How many moles are 3. 01 x 1022 atoms of magnesium?
Answer:
0.05 moles
Explanation:
There are about 6.02 * 10^23 atoms in a mole, so in the given sample, there are (3.01*10^22)/(6.02*10^23)=(1/2)(1/10)=0.05 moles.
Which question could be answered using the process of scientific inquiry?
Do cute mice find food quicker than less cute mice?
O How do mice know that they have to find food?
O Do mice like soda?
O How does caffeine affect a mouse's ability to find food in a maze?
Answer:
1st one
Explanation:
4. What causes local winds to form?
Answer:
unequal heating and cooling of the landmass.
Answer:
Local winds are caused by unequal heating of Earth's surface within a small area. Local winds form only when large-scale winds are weak. A sea breeze is a local wind that blows from an ocean or a lake.
Which of these reactions are redox reactions? Check all that apply. Cd HCl → CdCl2 H2 CuCl2 Na2S → 2NaCl CuS CaCO3 → CaO CO2 2ZnS 3O2 → 2ZnO 2SO2 CH4 2O2 → CO2 2H2O.
Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction.
What is redox reaction?Redox reactions are those reactions in which oxidation and reduction process takes place simultaneously.
Cd + 2HCl → CdCl₂ + H₂Above balanced equation is a redox reaction as in this reaction oxidation of Cadmium takes place from 0 to+2 state and reduction of hydrogen takes place from +1 to 0 state.
CuCl₂ + Na₂S → 2NaCl + CuSCaCO₃ → CaO + CO₂Above two balanced reaction are not the redox reaction as their is no oxidation or reduction takes place.
2ZnS + 3O₂ → 2ZnO + 2SO₂Above balanced equation is a redox reaction as in this reaction oxidation of sulfur takes place from -2 to+4 state and reduction of oxygen takes place from 0 to -2 state.
CH₄ + 2O₂ → CO₂ + 2H₂OAbove balanced equation is a redox reaction as in this reaction oxidation of carbon takes place from -4 to+4 state and reduction of oxygen takes place from 0 to -2 state.
Hence, Cd + 2HCl → CdCl₂ + H₂, 2ZnS + 3O₂ → 2ZnO + 2SO₂ and CH₄ + 2O₂ → CO₂ + 2H₂O reactions are redox reaction
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Answer:
1,4,5
Explanation:
How many moles are in 23 grams of CCl4?
Answer:
0.1494 moles
Explanation:
moles = mass/mm
mm of carbon tetrachloride is 154
so moles = 23÷154= 0.1494 moles.
4. The reaction of solid copper (II) oxide with hydrogen gas to form copper metal and
liquid water.
Type:
5. Calcium hydroxide solution and carbon dioxide gas yields solid calcium carbonate and
liquid water.
Type:
6. Solid calcium carbonate and a solution of sodium chloride are made when aqueous
calcium chloride and a solution of sodium carbonate react together.
Type:
Answer:
Explanation:
4. Reduction reaction as Cu++ is reduced to Cu.
5. Double displacement reaction as the CO3-- replaces 2x OH-
6. Precipitation as two solutions combine to form a precipitate and a secondary product.
4. How many moles of KBr are found in 3 Liters of 0.4 M solution?
A.7.1moles
B. 43.9moles
C. 2.6moles
D 1.2 moles
There are 1.2 moles of KBr found in 3 Liters of 0.4 M solution.
HOW TO CALCULATE NUMBER OF MOLES?The number of moles of a substance can be calculated by multiplying the molarity by the volume.
No. of moles = Molarity × volume
According to this question, 3L of a KBr solution are contained in a 0.4M.
no. of moles = 3L × 0.4M = 1.2moles
Therefore, there are 1.2 moles of KBr found in 3 Liters of 0.4 M solution.
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Determine the mass percent of metal and its atomic mass.
Answer:
To calculate the mass percent of an element in a compound, we divide the mass of the element in 1 mole of the compound by the compound's molar mass and multiply the result by 100.
A 90.0 g sample of an unknown metal absorbed 25.6 J of heat as its temperature increased 1.18 degrees C. What is the specific heat of the metal
The specific heat of the metal is 241.05 J/kg°C
What is specific heat capacity?Specific heat capacity can be defined as the amount of heat required to raise a unit mass of metal through 1 °C
To calculate the specific heat capacity of the metal, we use the formula below.
Formula:
Q = cm(t'-t)............... Equation 1Where:
Q = Heat absorbed by the metalc = specific heat capacity of the metalm = mass of the metalΔt = increase in temperaturemake c the subject of the equation
c = Q/m(Δt)................. Equation 2From the question,
Given:
Q = 25.6 Jm = 90 g = 0.09 kgΔt = 1.18 °CSubstitute these values into equation 2
c = 25.6/(1.18×0.09)c = 241.05 J/kg°CHence, the specific heat capacity of the metal is 241.05 J/kg°C.
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Rainforests are not generally considered a source of _______.
a.
foods
b.
spices
c.
medicines
d.
none of the above
Please select the best answer from the choices provided
A
B
C
D
Rainforests are not generally considered a source of none of the above choices. You can get food from Rainforests, and also spices and medicines. In fact, Rainforests have a variety of plants that have medicinal properties. When you know how to find the right plant in the rainforests, you can access almost everything.
Hence, your answer is D. None of the above-------------------------------------------------------------------------------------------------------------
Thanks!
Answered by: FieryAnswererGT
#learnwithbrainly
Answer:
D. None of the above
Explanation:
trusttt
Which of the following would be a stable compound?
A.
NaS2
B.
MgF2
C.
KF3
D.
BeO2
Answer:
A...NaS2.............
all the bases are not alkali why
Answer:
=》All bases are not alkali.
=》We use the term 'alkali' to refer to soluble bases / bases that are soluble in a liquid.
=》Since, only a few bases are soluble & the rest are not, we can't call all bases as alkalies.
=》Examples of alkalies: Lithium, Pottasium etc. They form strong bases.
Hope it helps ⚜
What volume would 2.25 moles of Ne gas occupy at STP?
Answer:
The volume would be 56 L of gas
Explanation:
Answer:
50.37L or 50.4L
Explanation;
= ( 22.4 dm³ × 2.25 moles ) ÷ 1 mole
= 50.4 dm³ 1dm³ = 1 L
If 2H2SO4 is part of a chemical equation, how many oxygens atoms from sulfuric acid are involved in the chemical equation
Answer: 8
Explanation: k*4O=2*4O=8O
How many moles of each element are in one mole of be(oh)2.
Answer:
How many moles of each element are in one mole of Be (OH)2? 1 mole of beryllium, 1 mole of oxygen, 2 moles of hydrogen 1 mole of beryllium, 2 moles of oxygen, 2 moles of hydrogen CORRECT ANSWER 2 moles of beryllium, 2 moles of oxygen, 2 moles of hydrogen
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1 moles of beryllium, 2 moles of hydrogen and 2 moles of oxygen are in one mole of Be(OH)[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically, the formula for mole is given as
number of moles of element=given mass of element÷ molar mass of element
1 moles of beryllium, 2 moles of hydrogen and 2 moles of oxygen are in one mole of Be(OH)[tex]_2[/tex].
Therefore, 1 moles of beryllium, 2 moles of hydrogen and 2 moles of oxygen are in one mole of Be(OH)[tex]_2[/tex].
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What do covalent bonds usually form at room temperature?.
Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation.
Which of the following are common characteristics of nuclei of the same element?
Answer:
D
Explanation:
the Same number of proton
Is the production of nitrogen(II) oxide exothermic or endothermic?
____________ rays show areas where large quantities of energy are released.
Answer:
Gamma
Explanation:
Answer:
Gamma
Explanation:
2. What are two types of local winds?
Answer:
The two main types of local winds are:
1. Sea Breezes.
2. Land Breezes.
Answer:
Out of all the local winds, two of the main local wind types will be land breezes and sea breezes. Or katabatic and foehn winds, and Anabatic winds.
hope this helps
Substances known as fuels have energy stored as:
chemical energy
mechanical energy
electrical energy
kinetic energy
Answer:
Chemical energy
Explanation:
The energy stored in the bonds of atoms and molecules, is chemical energy .
Stay safe stay healthy and blessed.
Have a great day !
Thank you
Answer: Chemical energy. :]
Explanation:
If 25 ml of KBr is dissolved in 100 ml of water, what is the percent volume of the solution produced?
Answer:
4
Explanation:
You need divide 100/25 and that's it
How much in grams, does 5.68 x 1022 formula units of potassium dichromate weigh?
Answer:
Explanation:
The molecular formula for Potassium Dichromate is K2Cr2O7. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Potassium Dichromate, or 294.1846 grams.
Note that rounding errors may occur, so always check the results.
