# Patrick wants to measure the oxalic acid contents in 20 mL of a solution. To this end, he adds...

## Question:

Patrick wants to measure the oxalic acid contents in 20 mL of a solution. To this end, he adds 100 mmol sodium dichromate to the solution. Then he titrates the remainder of the dichromate with a {eq}Fe^{2+} {/eq} solution of 1 mM, of which he needed 11 mL. What was the concentration of oxalic acid in the original solution?

## Redox Titration:

A redox titration experiment involves a transfer of one or more valence electrons between a standardized oxidizing/reducing titrant reactant and an unknown reducing/oxidizing analyte reactant. This redox reaction is represented by a balanced overall equation whose form will vary depending on the acidic or basic reaction environment present. The equivalence point of the redox titration is when the molar quantities of the two reactants match the molar ratio of this balanced overall equation. It is often referred to as the "endpoint" when using an indicator chemical during the titration, but this is technically not exactly the same as the equivalence point.

## Answer and Explanation: 1

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We begin at the **last** step where there is a redox reaction between the chromium in the remaining dichromate ion with iron (II). The **overall** reaction...

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Chapter 3 / Lesson 18Identify the concentration of a common household chemical, hydrogen peroxide. Using a known concentration of potassium permanganate, you'll be able to perform a titration experiment to discover the unknown concentration of hydrogen peroxide.

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