All categories

4 years ago

What is the ph of a solution with [h ] = 1.25x10–10 m?

Chemistry

2 answers:

MissTica4 years ago

4 0

Ph= - log[H+] = - log[1.25 x 10^-10] = 9.9. Hope it helps

ira [324]4 years ago

4 0

Answer:

pH= 9.9 This pH is alkaline

Explanation:

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH can be measured in an aqueous solution using a numerical value scale that measures the acidic solutions (highest concentration of hydrogen ions) and the alkaline solutions (base, lowest concentration) of the substances.

The numerical scale that measures the pH of substances ranges from 0 to 14. The most acidic substances approach number 0, and the most alkaline (or basic) substances that approach number 14. And a pH value of 7 is neutral; This means that the substance or solution is neither acidic nor alkaline.

The pH is expressed as the negative logarithm (base 10) of the concentration of hydronium ions [H₃O⁺] or hydrogen ions [H⁺]. This is:

pH= -log₁₀ [H₃O+]= -log₁₀ [H⁺]

also expressed as

pH= -log [H₃O+]= -log [H⁺]

So, in this case, you know that [H⁺]=1.25*10⁻¹⁰ M

Replacing in the definition of pH:

pH= -log 1.25*10⁻¹⁰

You get:

<u><em>pH is alkaline</em></u>

You might be interested in

The emission spectrum of cesium contains two lines whose frequencies are (a)

Lady bird [3.3K]

The lines are violet and blue respectively.

<h3>What is the energy?</h3>

We know that the energy of the photon could be obtained by the use of the equation;

E = hf

E = energy

h = Plank's constant

f = frequency

For the first line;

E = 6.6 * 10^-34 Js * 3.45 x 10^14 Hz = 2.3 * 10^-19 J

Given that;

E = hc/λ

λ = hc/E

λ = 6.6 * 10^-34 * 3 * 10^8/2.3 * 10^-19

λ = 8.61 * 10^-7 m or 861 nm

The color is violet

For the second line;

E = 6.6 * 10^-34 Js * 6.53 xx 10^14 Hz

E = 4.3 * 10^-19 J

E = hc/λ

λ = hc/E

λ = 6.6 * 10^-34 * 3 * 10^8/4.3 * 10^-19

λ = 4.60 * 10^- 7 m or 460 nm

The color is blue

Learn more about emission spectrum:brainly.com/question/13537021

#SPJ1

8 0

2 years ago

Rank these photons in terms of increasing energy:<br> (a) blue (λ=453nm)

alexira [117]

The increasing order of photons in terms of energy is Er < Ey < Eb

A photon is a tiny particle of electromagnetic radiation and its energy is proportional to the frequency and rest mass as zero.

By using the formula:

E = h * ν

E = h * c / λ

h = planks constant

c = speed of light

Since h * c is constant

E is inversely proportional to wavelength λ

For blue:

λ = 453 nm

Eb= k / 453

where k is constant

For red:

λ = 660 nm

Er = k / 660

For yellow:

λ = 595 nm

Ey = k / 595

Therefore,

The increasing order of photons in terms of energy is

Er < Ey < Eb.

For more information click on the link below:

brainly.com/question/15946945

# SPJ4

Complete question:

Rank the following photons in terms of increasing energy: (a) blue (λ = 453 nm); (b) red (λ = 660 nm); (c) yellow (λ = 595 nm).

8 0

2 years ago

List three criteria used to identify a cold front.

zaharov [31]

Answer:

Explanation:

A cold front is a transition zone from warm air masses to cold air masses. We use weather elements to identify cold fronts.

Temperature: Since air moves from warm masses to cold masses, the air in a cold front is at different temperatures. The air behind a cold front is warm while the one ahead is cold. This implies that within a cold front is at different temperatures.
Precipitation: Prior to the passing of cold front, precipitation is usually rife with low showers. A coldfront in itself is usually accompanied by heavy rainfall full of thunderstorms and lightening. After a coldfront, the showers steadies and decreases.
Pressure changes: before a coldfront, the atmospheric pressure decreases steadily. When the front arrives, the pressure further lowers with a sharp increase thereafter. After the front, the pressure can continue to increase.

3 0

3 years ago

. What is the percentage error for a mass measurement of 17.7 g, given that the correct value is 21.2 g?

lakkis [162]

Answer: 16.5% First, determine the total error by subtracting the accepted value from the value you measured. e = 17.7 -21.2 = -3.5 Then

divide the error

Explanation:

7 0

3 years ago

Type the correct answer in the box. Calculate the molar mass of aluminum oxide (Al2O3). Express your answer to four significant

Zepler [3.9K]

Molar mass can be given as the mass of each constitutive element in the formula unit. The molar mass of aluminum oxide is 101.957 grams.

<h3>What is a formula unit?</h3>

Formula unit can be defined as the one unit of the molecular formula of the compound. It describes the number of atoms of each element present in the compound.

The formula unit for Aluminum oxide is $\rm Al_2O_3$ . The molar mass has been the sum of the mass of aluminum and oxygen.

The molar mass of aluminum oxide has been given as:

$\rm Molar\;mass=2\;\times\;Al+3\;\times\;O\\Molar\;mass=2\;\times\;26.98\;+\;3\;\times\;15.99\;grams\\Molar\;mass=101.957\;grams$

The molar mass of aluminum oxide is 101.957 grams.

Learn more about molar mass, here:

brainly.com/question/12127540

6 0

3 years ago