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3 years ago

What does an atom become when it gains an electron in an ionic bond?

1 answer:

7 0

It becomes a acceptor because in an ionic bonding the element who gives out is a donor while the atom which accept is a acceptor

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A chemist titrates 220.0 mL of a 0.1917M propionic acid (HC2H5CO2) solution with 0.1787 M KOH solution at 25Â°C. Calculate the p

natima [27]

Answer : The pH at equivalence is, 9.08

Explanation : Given,

Concentration of $HC_2H_5CO_2$ = 0.1917 M

Volume of $HC_2H_5CO_2$ = 220.0 mL = 0.220 L (1 L = 1000 mL)

First we have to calculate the moles of $HC_2H_5CO_2$

$\text{Moles of }HC_2H_5CO_2=\text{Concentration of }HC_2H_5CO_2\times \text{Volume of }HC_2H_5CO_2$

$\text{Moles of }HC_2H_5CO_2=0.1917M\times 0.220L=0.0422$

As we known that at equivalent point, the moles of $HC_2H_5CO_2$ and KOH are equal.

So, Moles of KOH = Moles of $HC_2H_5CO_2$ = 0.0422 mol

Now we have to calculate the volume of KOH.

$\text{Volume of }KOH=\frac{\text{Moles of }KOH}{\text{Concentration of }KOH}$

$\text{Volume of }KOH=\frac{0.0422mol}{0.1787M}$

$\text{Volume of }KOH=0.00754$

Total volume of solution = 0.220 L + 0.00754 L = 0.22754 L

Now we have to calculate the concentration of KCN.

The balanced equilibrium reaction will be:

$HC_2H_5CO_2+KOH\rightleftharpoons C_2H_5CO_2K+H_2O$

Moles of $C_2H_5CO_2K$ = 0.0422 mol

$\text{Concentration of }C_2H_5CO_2K=\frac{0.0422mol}{0.22754L}=0.1855M$

At equivalent point,

$pH=\frac{1}{2}[pK_w+pK_a+\log C]$

Given:

$pK_w=14\\\\pK_a=4.89\\\\C=0.1855M$

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

$pH=\frac{1}{2}[14+4.89+\log (0.1855)]$

$pH=9.08$

Therefore, the pH at equivalence is, 9.08

6 0

3 years ago

In a solution, what is the substance that does the dissolving called?

Soloha48 [4]

Answer and Explanation:

The substance that does the dissolving (or dissolves in the solution) is the solute.

- The solute is the substance that is being dissolved

The substance that makes the solute dissolve is called the solvent.

#teamtrees #PAW (Plant And Water)

I hope this helps!

5 0

3 years ago

The Law of Conservation of Mass states that mass is neither created nor destroyed during cher

dmitriy555 [2]

The answer is true:)))))))))))))))

8 0

3 years ago

Read 2 more answers

PLEASE HELP!CHEMISTRY QUESTION

ozzi

Answer: The partial pressure of nitrogen on Venus is 81 mmHg

Explanation:

To calculate the partial pressure of the gas, we use the equation given by Raoult's law, which is:

$p_{A}=p_T\times \chi_{A}$

where,

$p_A$ = partial pressure of nitrogen gas = ?

$p_T$ = total pressure = 2700 mmHg

$\chi_A$ = mole fraction of nitrogen gas = 3.0 % = 0.03

Putting values in above equation, we get:

$p_{N_2}=2700mmHg\times 0.03\\\\p_{N_2}=81mmHg$

Hence, the partial pressure of nitrogen on Venus is 81 mmHg

8 0

3 years ago

The reaction H2(g)+F2(g)?2HF(g) is spontaneous at all temperatures. A classmate calculates the entropy change for this reaction

Pachacha [2.7K]

Answer:

The correct answer is there is a mistake in the calculation. The second law of thermodynamics state that in any spontaneous process there is an increase in the entropy of the universe.

Explanation:

According to the second law a reaction will occur in a system spontaneously if the total entropy of both system and surrounding increases during the reaction.That means in case of spontaneous reaction entropy change is always positive.

But according to the question the reaction H2+F2=2HF is spontaneous in all temperature.So according to the second law of thermodynamics i can say that my classmate made a mistake in calculation that"s why his result for entropy change comes negative.

6 0

3 years ago