What is the pH of a solution of 0. 25M K3PO4, potassium phosphate? Given

Ka1 = 7. 5*10^-3

Ka2 = 6. 2*10^-8

Ka3 = 4. 2*10^-13

I know there is another post here with the same question but nobody explained anything. Where does the K3 go? Why does everyone I see solve this just ignore it and go to H3PO4?

Explanation:

which one of the following a correct way of finding current?

Using a 0.100 M solution of magnesium hydroxide instead of the 0.100 M solution of sodium hydroxide affects the experiment by reducing the pH of the solution.

When you use a 0.100 M solution of magnesium hydroxide instead of the 0.100 M solution of sodium hydroxide, this affects the experiment by reducing the pH of the solution.

The neutralization reaction between HCl (acid) and NaOH (base) is: HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

The reaction of hydrochloric acid with magnesium hydroxide produces magnesium chloride and water. Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H2O(l)

Therefore, in the presence of a magnesium hydroxide solution, the reaction will be:

Mg(OH)2(aq) + 2HCl(aq) → MgCl2(aq) + 2H2O(l)It is noted that magnesium hydroxide is a weak base, and therefore, the pH of the solution will not be neutral.

Instead, magnesium hydroxide will result in a lower pH solution, i.e., it is more acidic, compared to sodium hydroxide, which produces a more basic solution.

Hence, using a 0.100 M solution of magnesium hydroxide instead of the 0.100 M solution of sodium hydroxide affects the experiment by reducing the pH of the solution.

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The correct option is B-2.  2 water molecules are produced in the reaction.

According to the given chemical reaction i.e.

2O2 + CH4 —> (x)H2O + CO2 we have to find the number of molecules of water so that all the elements in the reaction get balanced out.

Carbon atoms are equal on both sides so we have to equalize hydrogen atoms first. If we have 4 atoms of hydrogen on the left side it should be equal to the right side.

If we add two molecules of H20 the equation can be balanced.

After balancing we get,

2O2 + CH4 —> 2H2O + CO2

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The sequence goes 9, 16, 25, 36, and so on. Even though the sequence does not follow a constant difference or ratio, it still follows a clear pattern that is easily recognizable as perfect squares

The pattern given has neither a constant difference nor a constant ratio. However, upon observing the numbers, we can notice that they are all perfect squares.

Starting with 3² = 9, each subsequent number in the sequence is the next consecutive perfect square. The pattern can be described as a sequence of perfect squares, with each term being the next consecutive square after the previous term.

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If the atmospheric pressure is 14. 4 psi then the absolute pressure in the tank is 42.4 psi.

B. The manometer reading of 28 inches of mercury is equivalent to a pressure of 28 inches of mercury (1 atmosphere) plus the atmospheric pressure of 14.4 psia. Thus, the absolute pressure in the tank equals 28 inches of mercury plus 14.4 psia which is equivalent to 42.4 psia.

To calculate this, first convert the atmospheric pressure from psi to inches of mercury by multiplying by the pressure conversion factor of 0.491. This gives us 7.1 inches of mercury. Then, add this to the manometer reading of 28 inches of mercury, giving us a total of 35.1 inches of mercury.

Finally, convert this back to psia by dividing by the pressure conversion factor of 0.491, which gives us a total of 71.7 psi, or 42.4 psia absolute pressure in the tank.

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To determine if the ring is made of gold, we can calculate the expected heat transfer based on the specific heat of gold and compare it to the actual heat transfer observed in the experiment.

The heat transfer equation is given by:

q = m * c * ΔT

Where:

q = heat transfer

m = mass of the object

c = specific heat capacity

ΔT = change in temperature

Given:

m = 6.00 g

c (specific heat of gold) = 0.128 J/g°C

ΔT = 75°C - 25°C = 50°C

Calculating the expected heat transfer using the specific heat of gold:

q_expected = m * c * ΔT

= 6.00 g * 0.128 J/g°C * 50°C

= 38.40 J

The expected heat transfer based on the specific heat of gold is 38.40 J.

Comparing this with the actual heat transfer observed in the experiment, which is 38.7 J, we see that they are very close. This suggests that the ring is likely made of gold, as the measured heat transfer aligns with the expected heat transfer based on the specific heat of gold.

Therefore, based on this experiment, it is likely that the ring is indeed made of gold.

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Answer:

Together, the number of protons and the number of neutrons determine an element's mass number. Since an element's isotopes have slightly different mass numbers, the atomic mass is calculated by obtaining the mean of the mass numbers for its isotopes.

Answer:

Translated < what is the maximum number of electrons in the sublevel 4s?

answer 32 electrons

Answer:

I think the answer is chemical energy

Explanation:

When investigating whether or not the substance dibromoethane (ethylene dibromide) is carcinogenic, we follow the survival history of 161 white employees of 2 factories who were exposed to dibromoethane.

Among them, we observe 7 cancer deaths in the period 1940-1975. On the other hand, the mean number of cases over that period in that general population is expected to be 5.8. Do those 7 cases provide a reason to consider the substance as .Yes, the seven cases provide a reason to consider the substance dibromoethane as carcinogenic.

Since the number of cancer deaths observed in the 161 white employees exposed to dibromoethane is 7 which is greater than the expected cancer deaths in the general population, which is 5.8. Therefore, the excess cases may suggest that dibromoethane has some carcinogenic potential.

Hence, we can consider dibromoethane as carcinogenic.

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Answer:

the molecular structure of y shows that it is solid

Explanation:

because in solid state atoms are tightly packed and they are attached to them closely

Answer:

Ca(2+)

Explanation:

Sodium (Na) only have one valence electron and will lose it in order to gain a full octet. There will be an unbalance of electrons and protons where there are more protons there electrons. The correct ion formula for sodium is Na (1+).

Nitrogen has 5 valence electrons and will gain three more to gain a full octet. There will be an unbalance where there are more electrons then protons. Nitrogen will form the ion N (3-).

Calcium has two valence electrons and will lose them in order to gain a full octet. There will be an unbalance where there are more protons then electrons. Calcium will form the ion Ca 2+

Therefore, Ca2+ is the ion with the correct charge.

7.71×10¹¹g of Sodium Chloride are present in 8 x 10³³ particles. Sodium chloride (NaCl) is indeed an ionic compound.

Sodium chloride (NaCl) is indeed an ionic compound with the chemical name (NaCl), signifying a 1:1 ratio of sodium and chlorine ions. Sodium chloride is the salt chiefly responsible for seawater saltiness and the interstitial matrix of numerous multicellular organisms.

In its edible form, table salt, it is extensively employed as a condiment as well as food preservative. Massive volumes of NaCl are employed in a variety of industrial processes and serve as a primary source of salt and chlorine compounds used as feedstocks in subsequent chemical synthesis.

mole = number of atoms/  6.022×10²³

        =8 x 10³³/ 6.022×10²³

       =1.32×10¹⁰mole

mass =1.32×10¹⁰×58.44

         =7.71×10¹¹g

Therefore, 7.71×10¹¹g of Sodium Chloride are present in 8 x 10³³ particles.

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The molarity of the H₂O₂ in the reaction mixture will be 0.063 M

The molarity of the KI in the reaction mixture will be 0.071 M

Volume of H₂O = 55 ml

Volume of H₂O₂ (V1) = 5.0 ml

Volume of KI = 10.0 (V1) ml

Molarity of H₂O₂ (initial M1) = 0.88 M

Molarity of KI (initial M1) = 0.50 M

Molarity of H₂O₂ (final M2) = ?

Molarity of KI (final M2) = ?

Calculate the total volume V2

    V2 = 55.0 ml + 5.0 ml + 10.0 ml

    V2 = 70.0 ml

Calculate the molarity of H₂O₂ by using the following equation:

    M1 × V1 = M2 × V2

Rearrange it for M2

    M2 = M1 × V1 / V2

Put the values

    M2 = 0.88M × 5ml / 70ml

    M2 = 0.063M

Calculate the molarity of KI by using the following equation:

    M1 × V1 = M2 × V2

Rearrange it for M2

    M2 = M1 × V1 / V2

Put the values

    M2 = 0.5 M × 10 ml / 70ml

    M2 = 0.071 M

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The given chemical reaction is: HCl + NaOH → NaCl + H2O. It is a neutralization reaction and also double displacement reaction. Option b.

The reaction given is a neutralization reaction as this reaction is between an acid and a base and the end result of the reaction is to form salt and water. As, Hydrochloric acid (HCI) is an acid and Sodium hydroxide (NaOH) is a base, it will produce water and a salt, sodium chloride (NaCI) when they react with each other. Hence, option B is correct. Neutralization and double displacement are the two ways through which the given reaction can be classified.

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C8 columns refer to chromatography columns that contain a stationary phase consisting of hydrocarbon chains with eight carbon atoms. c8 columns means none of the given options. The correct answer is (d) None of the above.

C8 columns refer to chromatography columns that contain a stationary phase consisting of hydrocarbon chains with eight carbon atoms. These carbon chains are typically covalently bonded to a solid support material.

The C8 designation represents the length and composition of the hydrocarbon chains in the stationary phase.

These columns are commonly used in chromatography techniques, such as reversed-phase liquid chromatography, where nonpolar compounds are separated based on their interactions with the hydrophobic stationary phase.

The C8 stationary phase provides moderate retention for analytes with different polarities, allowing for effective separation.

The statement about ionic bonding or the presence of a phenyl group is not applicable to C8 columns.

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A temperature reversal is a layer in the air where air temperature increments with level. The lower part of a cap has an inversion. The cap is a layer of relatively warm air above. In the winter, a long, clear night is ideal for temperature inversion.

It ensures that the heat that escapes is greater than the heat that enters. Nevertheless, air should not be mixed vertically at lower levels. The earth is cooler than the air above it in the early morning hours because the day's heat is reflected off during the night. Temperature inversion is typical over polar regions.

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Answer:

19g

Explanation:

Given parameters;

Amount of energy  = 6346J

Unknown:

Mass of water frozen = ?

Solution:

This is a phase change and a latent heat was involve;

        H  = mL

H is the quantity of heat

m is the mass

L is the latent heat of fusion of water  = 335J/g

So;

        6346  = mass x  335

    Mass = 19g

Answer:

Temperature of gas C: 57

Height of column: 6.9

Temperature of gas K: 330

Volume of gas: 0.87

Answer:

It is C (water) and E (carbon dioxide)

Have a nice day!

Explanation:

Answer:

0.00505

Explanation:

You can google the answer or try to learn how to convert it

Answer:

potential energy into heat and kinetic energy.

Explanation:

The movement transforms one type of energy into two other forms. The potential energy into heat and kinetic energy describes the way that most of the energy is transformed. Therefore, option D is correct.

Kinetic energy is the energy associated with an object's motion. Kinetic energy is present in a speeding bullet, a walking person, and electromagnetic radiation such as light.

The energy associated with the constant, random bouncing of atoms or molecules is another example of kinetic energy.

Thermal potential energy is potential energy at the atomic and molecular levels when particles have the ability to convert to kinetic energy. Thermal kinetic energy, on the other hand, occurs when atoms and molecules begin to move as a result of heat and temperature.

Thus, option D is correct.

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Answer:

D: Chlorine( I may be wrong my chemistry year was a nightmare)

The awnser is chlorine (Cl) trust me

C. If  blood pressure decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises blood pressure.

The maintenance of blood pressure is defined as the high use of sodium in your diet and the low use of potassium in your diet can cause hypertension. It is also important to use those foods which are free from fats. It is also important that we should use fruits, vegetables, and grains in excessive amounts for the maintenance of blood pressure and for a healthy diet.

High blood pressure 190/110 mm Hg can cause the main vital organs of the body like the brain, heart, and kidney too. There are three factors that contribute to blood pressure which are resistance, blood viscosity, and blood vessel diameter.

So we can conclude that blood pressure is the pressure of circulating blood against the walls of the blood vessels.

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Which of the following statements are true of the maintenance

of blood pressure (BP)? (Read carefully and select all of the correct statements.)

A. Norepinephrine stimulates vasoconstriction in skin, viscera, and skeletal muscles, all of which lower BP.

B. Aldosterone stimulates the reabsorption of Na+ ions by the kidneys, which lowers BP.

C. If BP decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.

E. If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.

F. The hormone ANP increases the excretion of K+ ions by the kidneys, which helps conserve water and raise BP.

G. The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.

H. The elasticity of the large arteries helps decrease diastolic BP.

Answer:

i think its c somebody correct me if im wrong. but hope this help

Explanation:

Answer:

Steel often melts at around 1370 degrees C (2500°F)."

Explanation:

your welcome

Answer:

Steel often melts at around 1370 degrees C (2500°F)."

Explanation: