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3 years ago

What does the term density mean?

Chemistry

2 answers:

Natasha2012 [34]3 years ago

7 0

Answer:

The degree of compactness of a substance.

Explanation:

You can look at the dictionary

Alekssandra [29.7K]3 years ago

3 0

Answer - the degree of compactness of a substance.

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How many moles of solid NaF would have to be added to 1.0 L of 0.115 M HF solution to achieve a buffer of pH 3.46? Assume there

astra-53 [7]

Answer : The moles of solid NaF is, 1.09 mole.

Explanation : Given,

pH = 3.46

$K_a=7.2\times 10^{-4}$

Concentration of HF = 0.115 M

Volume of solution = 1.0 L

First we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (7.2\times 10^{-4})$

$pK_a=4-\log (7.2)$

$pK_a=3.14$

Now we have to calculate the moles of HF.

$\text{Moles of }HF=\text{Concentration of }HF\times \text{Volume of solution}$

$\text{Moles of }HF=0.115M\times 1.0L=0.115mol$

Now we have to calculate the moles of NaF.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{\text{Moles of NaF}}{\text{Moles of HF}}$

Now put all the given values in this expression, we get:

$3.46=3.14+\log (\frac{\text{Moles of NaF}}{0.115})$

$\text{Moles of NaF}=1.09mol$

Thus, the moles of solid NaF is, 1.09 mole.

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3 years ago

You have 5.00 L of 6.0 M KNO3. What volume does the solution need to be diluted to

mr Goodwill [35]

The answer to the question above is 3

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3 years ago

What is the name of the functional group that is attached to this hydrocarbon? The first and last of a chain of three carbons ar

disa [49]

Answer:

Ketone

Explanation:

As you are stating here, we have a carbonated chain of three carbons, and the first and last has 3 Hydrogens, then this means that we have CH₃ . The center carbon is a carbon double bonded to oxygen.

In general terms this belongs to the carbonyl group. However, this alone does not represent a functional group, but when it's in a chain with other radycals or chains, it becomes a functional group.

In this case, the molecule you are talking here is the following:

CH₃ - CO - CH₃

This molecule is known as the Acetone, and has the general form of:

R - CO - R'

Which belongs to a ketone as a functional group.

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raketka [301]

Radiation

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