Answer to Question #158493 in Inorganic Chemistry for Nawid Sayed

Question #158493

Please solve these questions, I try a lot to answer all of them but I couldn’t answer it.


Thanks in advance.

 

Propanoic acid (C2H5COOH) is described as a weak acid. Define the term weak acid.


 

Write a balanced chemical equation to show the dissociation of propanoic acid (C2H5COOH). Physical states must be included.


 

A solution of propanoic acid and sodium propanoate (C2H5COONa) behaves as a buffer. Describe the term buffer solution. No chemical equations are needed.


 

Write a balanced chemical equation to show the dissociation of sodium propanoate (C2H5COONa). Physical states must be included.

 

Explain how a solution containing propanoic acid and sodium propanoate can function as a buffer solution. Your answer must include balanced chemical equations, physical states included.


1
Expert's answer
2021-02-05T03:26:13-0500

Carboxylic acids are weak acids because they only partially ionise in solution. Their solutions do not contain many hydrogen ions compared to a solution of a strong acid at the same concentration. In a solution of strong acid, the molecules are fully ionised. In a weak acid, few of the molecules are ionised.

CH3CH2COOH + H2O <--> CH3CH2OO− + H3O+

Because propanoic acid is weak -- and therefore does not completely dissociate in water -- the formula is written with a forward/ reverse arrow to indicate that there is no particular favour of the products in equilibrium.

A buffer solution is a solution that only changes slightly when an acid or a base is added to it. For an acid-buffer solution, it consists of a week acid and its conjugate base. The added acid or base is neutralized.

C2H5COONa =C2H5COO^- + Na^+

Basically the first make is given by saying that C2H5COOH dissociates into C2H5COO- and H+ from which the H+ ion reacts with an OH- ion when present producing H2O and keeping the pH of the solution the same.


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Comments

Assignment Expert
01.02.21, 14:25

Dear Nawid Sayed, Questions in this section are answered for free. We can't fulfill them all and there is no guarantee of answering certain question but we are doing our best. And if answer is published it means it was attentively checked by experts. You can try it yourself by publishing your question. Although if you have serious assignment that requires large amount of work and hence cannot be done for free you can submit it as assignment and our experts will surely assist you.

Nawid Sayed
27.01.21, 01:13

Dear Sir/Madam Hope you are fine and safe. I posted the above Question and still, I'm waiting for the answer. please please help me with these questions. I tried to solve the question but as I have a lack of information I couldn't answer it. Many Thanks in Advance

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