A word equation summarizing the souring of wine is: grain alcohol(C_2H_5OH) + ox

Question

A word equation summarizing the souring of wine is: grain alcohol(C_2H_5OH) + oxygen rightarrow acetic acid + water. Please convert this word equation to a balanced chemical equation. The chemical equations in question 1 summarize aerobic bacterial oxidation of grain alcohol. Use this information to explain why it is possible to prevent wine in a corked bottle from turning to vinegar by: keeping the bottle on its side adding brandy to the wine (known as a fortified wine)? Different vinegars may have different percentages of acetic acid. Is vinegar a mixture, compound, or an element? If you had titrated standard NaOH, in the flask, against vinegar, in the buret, instead of the way you actually performed the titration, how would you have recognized the end-point with phenolphthalein indicator? Would carrying out the titration in this manner change your calculated results or conclusions? Why is it a good idea to rinse the buret with the NaOH solution, instead of with water, before filling it at the start of the titration?

Explanation / Answer

Solution :-

1)Balanced reaction equation is as follows

C2H5OH(l) + O2(g) -------- > CH3COOH(l) + H2O(l)

2)a) Keeping the bottle on its side causes no air contact of the alcohol so it do not allow the reaction of alcohol with O2 so that it can convert to acetic acid and water therefore keeping wine in corked bottle prevents the turing of alcohol into the vinegar

b)fortified wine means adding the brandy which is the additional alcohol to to wine this also do not allow the react the alcohol content of the wine to react with oxygen so it prevets the conversion of the alcohol into the vinegar.

3) vinegar is the homogeneous mixture of the acetic acid and water. The usual content of the vinegar is about 5 to 6 % solution.

4) If we titrate the NaOH in the flask and acetic acid that is vinegar from the burrete the NaOH solution will give the pink color when indicator is added to it and when we do the titration of the this pink colored solution with vinegar solution then it will cause the color of the solution to disappear so the end point of the titration is pink to colorless. Carrying titration this way do not change the results of the titration. The calculated percentage or amount of the vinegar solution would remain same.

5) It is good to rinse the burrete with the NaOH solution because if any moisture is present in the burrete then it can change the concentration of the NaOH solution. Also if any previously used solution traces remain in the burrete will also be removed by the rinsing with NaOH which will give the more accurate result for the titration and gives correct concentrations of the unknown which would be determined by the titration.

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