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2 years ago

A solution has a [OH-] of 1 x 10^-12 M. What is the [H3O+] of the solution?

1 answer:

4 0

First, lets find the pOH
pOH=-log[OH] ----> pOH=-log[1x10^-12] ----->pOH=12
Now we can find the pH
14-12=2
Now we can use the pH=-log[H3O] to find the hydrogen ion concentration
2=-log[H3O] ------>[H3O]=1.0 x 10^-2

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What is the final temperature of a sample of water if 12.15J of energy is added to 475g of water at an initial temperature of 20

VikaD [51]

Answer:

The final temperature of water is <u>20.5061 °C.</u>

Explanation:

Let the final temperature of water be 'x'.

Given:

Heat added to water is, $Q_{in}=12.15\ J$

Initial temperature of water is, $T=20.5\ \°C$

Mass of water is, $m=475\ g$

Now, heat is added to water and its temperature is increased. The temperature is increased because water absorbs all the heat.

Heat absorbed by water is given as:

$Q_{abs}=mc(x-T)$ where 'c' is specific heat capacity of water and its value is equal to 4.186 J/g °C.

Now, plug in the given values and simplify.

$Q_{abs}=475\times4.186\times(x-20.5)\\Q_{abs}=1988.35(x-20.5)$

Now, from law of conservation of energy, we know that:

Heat absorbed by water = Heat added to water

$Q_{abs}=Q_{in}\\1988.35(x-20.5)=12.15\\x-20.5=\frac{12.15}{1988.35}\\x-20.5=0.0061\\x=20.5+0.0061=20.5061\ \°C$

So, the final temperature of water is 20.5061 °C.

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3 years ago

How does acid base extraction work.

jarptica [38.1K]

Answer:

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2 years ago

Read 2 more answers

Determine the balanced chemical equation for this reaction. C8H18(g)+O2(g)→CO2(g)+H2O(g)

ankoles [38]

Answer: balanced reaction equation

C8H18(g) + 25/2 O2(g) ---------> 8CO2(g) + 9H2O(l)

Explanation:

Part A- coefficients

1, 25/2,8,9

Part B

Oxygen is the limiting reactant

Part C

If 1 mole of octane produced 9 moles of water from the balanced reaction equation

0.28 moles of octane will produce 0.28×9= 2.52 moles of water

Part D

If 12.5 moles of oxygen reacts with 1 mole of octane

0.63 moles of oxygen will react with 0.63/12.5=0.0504moles of octane

Amount of octane left= 0.280-0.0504=0.2296 moles

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3 years ago

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OleMash [197]

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3 years ago

What information did the scientists miss in 1948 and 1966 that caused them to

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Answer:

The information from Mariner 6 and Mariner 7

Explanation:

Because they had not been launched yet

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3 years ago