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kumpel [21]
3 years ago
7

Calculate the pH of a solution if the concentration of hydroxide ions (OH-) is 3.6 x 10-11M?

Chemistry
1 answer:
baherus [9]3 years ago
7 0

Answer:

3.56

Explanation:

pH refers to a measure of hydrogen ion concentration. It measures acidity or alkalinity of a solution. It usually ranges from 0 to 14.

If pH of aqueous solutions at 25°C is less than 7 then they are acidic, while  aqueous solutions with a pH greater than 7 are alkaline.

Concentration of hydroxide ions = 3.6\times 10^{-11}

pH = -log \left ( 3.6\times 10^{-11} \right )=10.44

pOH = 14 - pH = 14 - 10.44 = 3.56

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Answer:

Endergonic reaction or nonspontaneous reaction.

Explanation:

Gibbs free energy is a state function that determines the spontaneity or feasibility of the given reversible chemical reaction, at fixed pressure and temperature. It is given by the equation:

ΔG = ΔH - TΔS

Here, ΔG - change in Gibbs free energy

ΔH- The change in enthalpy of reaction

ΔS - The change in entropy

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When the <u>change in the Gibbs free energy for a given reaction is positive</u> (ΔG > 0), then that chemical reaction is known as an endergonic reaction or nonspontaneous reaction.

4 0
3 years ago
What are 2 of the characteristics of temporary physical change
Natali5045456 [20]

Answer:

Temporary in nature.

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Explanation:

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8 0
2 years ago
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How many grams of CO are needed to produce 209.7 g Fe?<br><br> Fe2O3+3CO⟶3CO2+2Fe
kirill115 [55]

Answer:

157.8 g

Explanation:

Step 1: Write the balanced equation

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Step 2: Calculate the moles corresponding to 209.7 g of Fe

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209.7 g × 1 mol/55.85 g = 3.755 mol

Step 3: Calculate the moles of CO needed to produce 3.755 moles of Fe

The molar ratio of CO to Fe is 3:2. The moles of CO needed are 3/2 × 3.755 = 5.633 mol

Step 4: Calculate the mass corresponding to 5.633 moles of CO

The molar mass of CO is 28.01 g/mol.

5.633 mol × 28.01 g/mol = 157.8 g

4 0
2 years ago
When using microscopes, what are the two variables that matter the most<br>i think its chemistry.​
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Answer:

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Explanation:

Two parameters are especially important in microscopy: magnification and resolution. Magnification is a measure of how much larger a microscope (or set of lenses within a microscope) causes an object to appear.

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2 years ago
A model of fossils formed on land, on the shore, and in water was set up in Ms. Bill’s classroom. One of the students commented
zubka84 [21]

Answer:

d.- The model does not provide information about the type of rock in which fossils form.

Explanation:

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