Answer:
Explanation:
Hello,
In this case, considering the given information the redox reaction is:
Which properly balanced turns out:
In such a way, one sees a 6 to 1 molar relationship between the standard iron (II) solution and the dichromate, therefore, by using the following equation it is possible to determine the oxygen as shown below:
Thus, the moles of iron (II) solution are:
Moreover, the moles of dichormate result:
Thereby, the volume of the sample is:
Finally, the chemical oxygen demand result:
Best regards.