Chemistry Middle School

What is the hydrogen ion concentration of a solution with pH = 8.75 ?

Answers

Answer 1

Answer:

The answer is 1.778*10^-9

Explanation:

Using the formula

pH = -log[H^+]

Since the pH of the solution has been given to be 8.75,

Therefore,

8.75= -log [H^+]

Let's take H^+ to be x

8.75= -log x

Let's look for x, since the log is in base 10

X = 10^-8.75

X = 1.778 * 10^ -9

Therefore, H^+ =1.778 *10^-9

Related Questions

Of 0.605 g of magnesium hydroxide reacts with 0.800 g of sulfuric acid, what is the mass of magnesium sulfate produced? Steps would be appreciated! Thanks (:

Answers

Answer:

Mass = 0.963 g

Explanation:

Given data:

Mass of Mg(OH)₂ = 0.605 g

Mass of H₂SO₄ = 0.800 g

Mass of MgSO₄ = ?

Solution:

Chemical equation:

Mg(OH)₂  +  H₂SO₄   →    MgSO₄ + 2H₂O

First of all we will calculate the number of moles of each reactant.

Number of moles of Mg(OH)₂:

Number of moles = mass / molar mass

Number of moles = 0.605 g / 58.32 g/mol

Number of moles = 0.01 mol

Number of moles of H₂SO₄ :

Number of moles = mass / molar mass

Number of moles = 0.800g / 98.08 g/mol

Number of moles = 0.008 mol

Now we will compare the moles of MgSO₄ with  Mg(OH)₂ and  H₂SO₄  

         Mg(OH)₂         :           MgSO₄    

               1                 :               1

              0.01            :            0.01

   

             H₂SO₄             :           MgSO₄    

               1                      :               1

              0.008                :            0.008

The number of moles of magnesium sulfate produced by sulfuric acid are less so it will be a limiting reactant.

Mass of magnesium sulfate:

Mass = number of moles × molar mass

Mass = 0.008 mol × 120.37 g/mol

Mass = 0.963 g

Question 4 of 15 2 Points
If 100 joules of heat are added to a gas in an isochoric process, what is the
change in its internal energy?
O A. -100
O B. 300 j
.2003
O D. 100

Answers

Answer:D. 100 j

Explanation:

Answer:

100 J

Explanation:

I've just answered this on a quiz

For a different reaction, Kc = 1.39, kf=12.6s−1 , and kr= 9.08 s−1 . Adding a catalyst increases the forward rate constant to 4.28×103 s−1 . What is the new value of the reverse reaction constant, kr, after adding catalyst?

Answers

Answer:

       

Explanation:

The equilibrium constant is equal to the quotient of the forward rate to the reverse rate.

         

Adding a catalyst increases both the forward rate and the reverse rate in the same proportion without net effect on the equilibrium position.

Then, the equilibrium constant before and after adding the catalyst is the same.

Thus, knowing the forward rate constant and the equilibrium constant you can determine the reverse rate constant:

               

1. Which is not an example of a physical change to a wooden stick? A) slicing wood shavings from the stick
B) bending the stick back and forth
C) burning the stick
D) chopping the stick in half

Answers

The answer is C. burning the stick. This is because burning the stick will change the chemical properties of the wood, and it will not be wood anymore, it will be ash and the rest will be heart or gas.

Answer:

C) Buring the stick

Explanation:

Oh no! The thermometer punctured a hole in the bottom of the coffee cup, and water is spilling out.
Check all actions you would take.
Throw the broken pieces away.
Use the punctured cup as the outside cup,
not the inside cup.
0 Replace the cup
O Clean the area
| Mention the spill to the teacher.
O Call 9-1-1

Answers

Answer:Throw the broken pieces away, Replace the cup, Clean the area, Mention the spill to the teacher.

Explanation:

Answer:

1,3,4,5

Explanation:

A chemistry teacher adds 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution? Use M subscript i V subscript i equals M subscript f V subscript f..
0.300 M
0.375 M
6.00 M
7.50 M

Answers

Answer:

Explanation:

This question tests for concentration after dilution of the solution. is added to 200ml of water.

The formula for concentration correlation is given as , where the latter relates to the final solution mix.

Therefore the concentration is 0.300M

Answer:

a on edge

Explanation:

Lab Report: Factors Affecting Solution Formation 1. On the basis of your results, what is the relationship between the temperature of the solvent and the solubility of KCl and KClO3 (Show the both graphs)?


2. Provide the two unknowns A and B and describe how you determined the identity using your data.


3. Explain three factors the affect how fast substances dissolve.


PLEASE HELP ME WITH THESE QUESTIONS

Answers

Answer:

Maybe the number of atoms, Numbers of ions formed, and strength of the various bonds.

Explanation:

Bicycles- How do different forms of transportation meet people’s transportation needs?

Answers

Answer: Different ways of transportation mean getting to one place by multiple different transportation it actually all  depends on were you need to go

Explanation:

Some forms of transportation are meant for small rides or trips while other forms are meant for long far away rides

Which example of transportation most likely involves the widest variety of vehicles? A. Blood is rushed from a blood bank to a local hospital.
B. Fresh vegetables are transported from a farm to a nearby city.
C. science textbook is transported from a printer in China to your school, and then to your home.
D. Gravel from a gravel pit is transported to construction sites across the state.

Answers

C. Science textbook is transported from a printer in China to your school, and then to your home.

In the equation below, identify the Brønsted-Lowry acid, Brønsted-Lowry base, conjugate acid, conjugate base. NH4+(aq) + NO-2 (aq) = HNO2(aq) +NH3(aq)

Answers

Answer:

HNO₂ is Bronsted- Lowery conjugate acid.

NH₃ is Bronsted- Lowery conjugate base.

NH₄⁺(aq)  is  Bronsted- Lowery acid.

NO₂⁻²is  Bronsted- Lowery base.

Explanation:

Bronsted- Lowery acid:

Bronsted- lowery acid is the specie which have capability to donate the proton.

Bronsted- Lowery conjugate base:

The Bronsted- Lowery conjugate base of Bronsted- Lowery acid is the specie which is formed after when an acid donate the proton.

Bronsted- Lowery base:

Bronsted- lowery base is the specie which have capability to accept the proton.

Bronsted- Lowery conjugate acid:

The Bronsted- Lowery conjugate acid of Bronsted- Lowery base is the specie which is formed after when an base accept the proton.

Chemical equation:

NH₄⁺(aq) + NO₂⁻²(aq) → HNO₂(aq) + NH₃(aq)

NH₄⁺(aq)  have an extra proton and can donate it so it is Bronsted- Lowery acid.

NO₂⁻² have negative charge and can accept the proton so it is  Bronsted- Lowery base.

HNO₂ is Bronsted- Lowery conjugate acid.

NH₃ is Bronsted- Lowery conjugate base.

Which of these factors make hydrogen fuel cells a better option than burning fossil fuels

Answers

Answer: Air

Explanation: Fossil fuels mess up the air while Hydrogen fuel cells keep the air clean

1 Point What is the temperature in kelvins of 23°C?
O A. 11.9K
O B. 6279K
OC. 296K
O D. 250k

Answers

Answer:

Option C. 296K

Explanation:

T°C = 23°C

To covert the above to Kelvin temperature, use the following equation

T(K) = T°C + 273

T(K) = 23 + 273

T(K) = 296K

How many grams are in 8.9 moles of CaCO3

Answers

Answer:

0.0046108957310483

Explanation: you will have to convert it to grams

Which set of products is most likely to result from the combustion reaction shown below? C4H8(l) + 6O2(g) A. 2C2H4O6(g) B. 4CO2(g) + 4H2O(g) C. 4CO3(g) + 4H2(g) D. 4C(s) + 4H2O(l)+ 4O2(g)

Answers

Answer:

Option B. 4CO2(g) + 4H2O(g)

Explanation:

Combustion reaction produces CO2 and H20. We need to write a balanced equation to determine the product formed. This is illustrated below:

C4H8 + 6O2 —> 4CO2 + 4H2O

How many atoms are present in 9 molecules of NH4CN?

Answers

Answer:

5.418x10^24 atoms

Explanation:

1mole of a substance contains 6.02x10^23 atoms.

From the above, it means that 1mole of NH4CN contains 6.02x10^23 atoms.

Therefore, 9 moles of NH4CN will contain = 9 x 6.02x10^23 = 5.418x10^24 atoms

What is the standard unit of frequency

Answers

Answer:

Hertz (I guess you can say love HERTZ)

Explanation:

The hertz (image: Hz) is the determined unit of recurrence in the International System of Units (SI) and is characterized as one cycle for every second. It is named after Heinrich Rudolf Hertz, the principal individual to give definitive evidence of the presence of electromagnetic waves.

How many grams of H3PO4 are produced when 10.0 moles of water react with an excess of P4O10? P4O10(s) + 6H2O(l) → 4H3PO4(aq)

Answers

Answer:

652.6 g of H₃PO₄ are formed

Explanation:

Reaction is:

P₄O₁₀(s) + 6H₂O(l) → 4H₃PO₄(aq)

As P₄O₁₀ is the reactant in excess, the limiting is water.

Ratio is 6:4. We make a rule of three:

6 moles of water produce 4 moles of phosphoric acid

Therefore, 10 moles of water may prodyce (10 .4) / 6 = 6.66 moles of H₃PO₄

We convert the moles to mass:

6.66 moles . 97.9 g / 1mol = 652.6 g

Answer:

652.6 g

Explanation:

trust

Which sources of energy are used by humans to produce electrical energy? (a) Plants, animals, and fossil fuels
(b) Wind, water, and fossil fuels
(c) Water, wood, and wind
(d) Wind, water, and soil

Answers

Answer:

(b) Wind, water, and fossil fuels

Explanation:

Answer:

b wind water and fossil fuels

What causes events such as earthquakes, volcanic eruptions, and the creation of mountains?

Answers

Answer:

Plate Techtonics

Explanation:

Answer:

The answer is C. Explosions occurring in magma chambers

Explanation:

I took the test and got a 100%!!!!

Earth's lithospheric plates A.
move only up and down.
B.
move only once.
C.
do not move.
D.
are constantly in motion.

Answers

The answer is - D. are constantly in motion

These plates move back and forth and sometimes even end up going one above other

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