What formula was used to find the answer

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Answer 1

Answer: Can you give more information?

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14) Describe the Cloud Model.

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Electron cloud is an informal term in physics. It is used to describe where electrons are when they go around the nucleus of an atom. The electron cloud model is different from the older Bohr atomic model by Niels Bohr. Bohr talked about electrons orbiting the nucleus.

Pls answer this question

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Answer:

A carbon dioxide and oxygen

A buffer solution is 0.413 M in HF and 0.237 M in KF. If Ka for HF is 7.2×10-4, what is the pH of this buffer solution?

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Answer:

2.90

Explanation:

Any buffer system can be described with the reaction:

$HA~->~H^+~+~A^-$

Where $HA$ is the acid and $A^-$ is the base. Additionally, the calculation of the pH of any buffer system can be made with the Henderson-Hasselbach equation:

$pH=pKa~+~Log([A^-])/([HA])$

With all this in mind, we can write the reaction for our buffer system:

$HF~->~H^+~+~F^-$

In this case, the acid is $HF$ with a concentration of 0.413 M and the base is $F^-$ with a concentration of 0.237 M. We can calculate the pKa value if we do the "-Log Ka", so:

$pKa~=~-Log(7.2X10^-^4)=~3.14$

Now, we can plug the values into the Henderson-Hasselbach

$pH=~3.14~+~Log(([0.237~M])/([0.413~M]))~=~2.90$

The pH value would be 2.90

I hope it helps!

An insulated container contains 0.3 kg of water at 20 degrees C. An alloy with a mass of 0.090 kg and an initial temperature of 55 degrees C is mixed with the water in the insulated container. When thermal equilibrium is reached, the temperature of the mixture is 25 degrees C. Assume that heat flows only between the alloy and the water. What is the specific heat of the alloy?