All categories

3 years ago

Calculate the ph and the poh of an aqueous solution that is 0.030 m in hcl(aq) and 0.070 m in hbr(aq) at 25°c.

Chemistry

1 answer:

pickupchik [31]3 years ago

7 0

Solution:

Since, both are strong acids. So both ionize 100% in solution.

Let us consider that we have 1 liter of the solution. In it, we have 0.030 moles of H+ (from the HCl) and 0.070 moles of H+ (from the HBr) for a total of 0.100 mole in 1 liter. Here we ignore the chloride ion and the bromide ion since both acids ionize 100%. The only important ion (for pH) is the H+.

In terms of just the H+, this is 0.100 M

pH = - log 0.100 = 1.000

And

pH + pOH = 14.000

-1.000+14.000=13.000

Therefore,

pOH = 13.000

You might be interested in

I have 3 questions i'm curious about *SCIENCE*

jekas [21]

Answer:

1. 100%

2. 25%

3. 75%

Explanation:

Hope this helps, sorry in advance if any of these were wrong :)

5 0

2 years ago

A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is 10.59 nm . What is the total w

Readme [11.4K]

Whenever objects are placed in a line with spaced in between them, the number of spaces is one less than the number of objects. For reference, you may hold up four fingers and count the spaced between your fingers.

Therefore, if there are 105 molecules, then there are 104 spaces present.

We also know that 1 mm = 1000 nm. So, we first convert the spacing to millimeters as the final answer is required in millimeters

spacing = 10.59/1000 = 0.01059 mm

Now, the width of the lattice will be (ignoring the size of the molecules):

104 * 0.01059

1.10 millimeters

8 0

3 years ago

Calculate moles of Fe in 5.22 X 10^22 atoms of Fe?

Setler [38]

Answer:

The amount of moles of Fe in 5.22*10²² atoms of Fe is 0.0867.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023*10²³ atoms are contained in 1 mole, 5.22*10²² atoms are contained in how many moles?

$amount of moles=\frac{5.22*10^{22}atoms * 1 mole}{6.023*10^{23}atoms}$

amount of moles= 0.0867

The amount of moles of Fe in 5.22*10²² atoms of Fe is 0.0867.

5 0

2 years ago

A chemistry student needs of acetic acid for an experiment. He has available of a w/w solution of acetic acid in acetone. Calcul

Volgvan

Answer:

49.4 g Solution

Explanation:

There is some info missing. I think this is the original question.

A chemistry student needs 20.0g of acetic acid for an experiment. He has 400.g available of a 40.5 % w/w solution of acetic acid in acetone.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button. Round your answer to 3 significant digits.

We have 400 g of solution and there are 40.5 g of solute (acetic acid) per 100 grams of solution. We can use this info to find the mass of acetic acid in the solution.

$400gSolution \times \frac{40.5gSolute}{100gSolution} = 162 g Solute$

Since we only need 20.0 g of acetic acid, there is enough of it in the solution. The mass of solution that contains 20.0 g of solute is:

$20.0gSolute \times \frac{100gSolution}{40.5gSolute} = 49.4g Solution$

4 0

3 years ago

Why are atoms considered the building blocks life?

dmitriy555 [2]

Because atoms can join together to form molecules, which in turn form most of the objects around us.

7 0

2 years ago