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4 years ago

What is h20????????????????????

Chemistry

2 answers:

Minchanka [31]4 years ago

6 0

Answer:

it is water, the formula that makes it up. hygrogen and oxygen

blsea [12.9K]4 years ago

3 0

Answer:

H2O is the chemical formula for water or in simple language its is water

Explanation:

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suppose that two hydroxides, moh and m′ (oh)2, both have a ksp of 1.39 × 10−12 and that initially both cations are present in a

11Alexandr11 [23.1K]

When base is added in order to increase the pH of a solution, it results in MOH salt <u>precipitating first.</u>

Equation :

MOH (s) ⇄ M⁺ (aq) ₊ OH⁻(aq)

K $sp$ = [M⁺] [OH⁻]

K $sp$ = 1.39×10⁻¹² and [M⁺] = 0.001M

∴ 1.39×10⁻¹² = (0.001M) [OH⁻]

[OH⁻] = 1.004×10⁻¹⁹M

pOH = -log [OH⁻] = 11.9

pH = 14 - pOH

= 14 - 11.9

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8 0

2 years ago

The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error

JulijaS [17]

Answer:

$1.35\times 10^{-4} M$ was the concentration of the original solution.

Explanation:

$M_1V_1=M_2V_2$ (Dilution)

where,

$M_1\text{ and }V_1$ are molarity and volume of non diluted sample.

$M_2\text{ and }V_2$ are molarity and volume of diluted sample.

$M_1=?$

$V_1=100.0 \mu L=0.1 mL$

(1μL=0.001 mL)

$M_2=6.41\times 10^{-6} M$

$V_2=2.00 mL + 100.0 \mu L=2.00 mL+0.1 mL=2.1 mL$

Substituting all values :

$M_1\times 0.1 mL=6.41\times 10^{-6} M\times 2.1 mL$

$M_1=\frac{6.41\times 10^{-6} M\times 2.1 mL}{0.1 mL}=1.35\times 10^{-4} M$

$1.35\times 10^{-4} M$ was the concentration of the original solution.

5 0

3 years ago

What type of ignition occurs when a mixture of fuel and oxygen encounter an external heat source with sufficient heat?

mars1129 [50]

The ignition occurs when a mixture of fuel & oxygen encounter an external heat source with sufficient heat<u> Piloted ignition.</u>

<h3>What is Piloted ignition?</h3>

When a volatile fuel is close to a nearby local energy source (pilot) and reaches its lower limit of flammability in air, piloted ignition may be possible. The flame that originates in the premixed system spreads outward from the pilot. The first law of thermodynamics for systems with fixed mass only describes the energetics of this process.

<h3>Definition of thermodynamics </h3>

The science of thermodynamics examines how heat, work, temperature, and energy are related. The general topic of thermodynamics is the transfer of energy from one location or form to another. The fundamental idea is that heat is a type of energy that is equivalent to a specific quantity of mechanical labor.

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4 0

2 years ago

If 10.00 mL of the solution prepared in question 4 is used to make another 125.00 mL solution of NaCl, what is the new concentra

choli [55]

The new concentration of the solution is 0.016 M

<h3>Dilution</h3>

From the question, we are to determine the concentration of the new solution prepared from question 4.

NOTE: Question is provided below

From question 4, the concentration of the sodium chloride solution is 0.200M

Now, to determine the new concentration,

Using the dilution law

C₁V₁ = C₂V₂

Where

C₁ is the initial concentration

V₁ is the initial volume

C₂ if the final concentration

and V₂ is the final volume

Then,

C₁ = 0.200 M

V₁ = 10.00 mL
C₂ = ?

V₂ = 125.00 mL

Then,

0.200 × 10.00 = C₂ × 125.00

$C_{2}= \frac{0.200 \times 10}{125.00}$

C₂ = 0.016 M

Hence, the new concentration of the solution is 0.016 M

Question 4:

Calculate the amount of solid sodium chloride needed to make 200.00 mL of a 0.200 M solution

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2 years ago

please help asap will give brainiest What is the independent variable in an experiment? A) The variable that remains the same th

iogann1982 [59]

A because if it remains through the whole expídeme y the same the it doesn’t depend on anything else to change it and I got it correct

5 0

3 years ago