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3 years ago

Calculate pH A decrease of one unit on the pH scale means a solu-

Physics

1 answer:

kozerog [31]3 years ago

5 0

Answer:

1,000 times

Explanation:

Lower pH means that the solution is more acidic

A decrease of two units means that the new solution is 100 times more acidic than the original one:

$pH=-log[H_3O^+]}\\\\pH_2-pH_1=2\\\\-log[H_3O^+]_2-(-log[H_3O^+]_1})=2\\\\-log[H_3O^+]_2+log[H_3O^+]_1})=2\\\\\\\log\dfrac{[H_3O^+]_2}{[H_3O^+]_1}=2\\ \\ \\ \dfrac{[H_3O^+]_2}{[H_3O^+]_1}=10^2\\ \\\\ \dfrac{[H_3O^+]_2}{[H_3O^+]_1}=100$

The final equality means that the when the pH decreases two units, the new solution is 100 times more acidic.

Use the same when the pH decreases from 7.0 to 4.0, which is three units of decrease:

$pH_2-pH_1=7.0-4.0\\\\-log[H_3O^+]_2-(-log[H_3O^+]_1})=3.0\\\\-log[H_3O^+]_2+log[H_3O^+]_1})=3.0\\\\\\\log\dfrac{[H_3O^+]_2}{[H_3O^+]_1}=3.0\\ \\ \\ \dfrac{[H_3O^+]_2}{[H_3O^+]_1}=10^3\\ \\\\ \dfrac{[H_3O^+]_2}{[H_3O^+]_1}=1000$

That means that the acid precipiation (pH = 4.0) is 1,000 times more acidic than pure water (pH = 7.0)

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yanalaym [24]

Answer:

5,000J

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3 years ago

A long, straight, horizontal wire carries a left-to-right current of 40 A. If the wire is placed in a uniform magnetic field of

sladkih [1.3K]

Answer:

The magnitude of the resultant of the magnetic field is $4.11\times10^{-5}\ T$

Explanation:

Given that,

Current = 40 A

Magnetic field $B=3.7\times10^{-5}\ T$

Distance = 22 cm

We need to calculate the magnetic field

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$B'=\dfrac{\mu_{0}I}{2\pi r}$

Where, r = distance

I = current

Put the value into the formula

$B'=\dfrac{4\pi\times10^{-7}\times20}{2\pi\times0.22}$

$B'=1.8\times10^{-5}\ T$

We need to calculate the magnitude of the resultant of the magnetic field

Using formula of resultant

$B''=\sqrt{B^2+B'^2}$

Put the value into the formula

$B''=\sqrt{(3.7\times10^{-5})^2+(1.8\times10^{-5})^2}$

$B''=4.11\times10^{-5}\ T$

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3 years ago

Complete the following:

masha68 [24]

When light is incident parallel to the principal axis and then strikes a lens, the light will refract through the focal point on the opposite side of the lens.

To find the answer, we have to know about the rules followed by drawing ray-diagram.

<h3>What are the rules obeyed by light rays?</h3>

If the incident ray is parallel to the principal axis, the refracted ray will pass through the opposite side's focus.
The refracted ray becomes parallel to the major axis if the incident ray passes through the focus.
The refracted ray follows the same path if the incident light passes through the center of the curve.

Thus, we can conclude that, when light is incident parallel to the principal axis and then strikes a lens, the light will refract through the focal point on the opposite side of the lens.

Learn more about refraction by a lens here:

brainly.com/question/13095658

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2 years ago

Explain whether the unit of work is a fundamental or derived unit

klasskru [66]

Answer:

answer here

Explanation:

the unit of work is fundamental unit because it doesn't depend on other units.

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3 years ago

Read 2 more answers

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olga nikolaevna [1]

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3 years ago