# Chemistry Titration Challenge: Calculate Percentage Composition, Normality, and ppM!

## Can you calculate the percentage composition of K2C2O4 in the sample?

Given a 1.000-g sample containing K2C204 (166.21 g/mol) titrated with 40.00 mL of .0200 M KMnO4 in acid solution, can you calculate the percentage composition of K2C2O4 in the sample?

## What is the normality of the KMnO4 used in the titration?

If the balanced chemical equation is 5C2042- + 2 MnO4 + 16 H+ + 2 Mn2+ + 10 CO2 + 8 H2O, what is the normality of the KMnO4 used in the titration?

## How many ppM of K+ are in the sample?

Given the molar mass of K+ (39.098 g/mol), can you calculate the ppM of K+ in the sample?

## Answers:

A. The percentage composition of K2C2O4 in the sample is 100%.

B. The normality of the KMnO4 used in the titration is 0.0400 N.

C. The ppM of K+ in the sample is 469,000 ppM.

## Explanation:

To calculate the percentage composition of K2C2O4 in the sample, we need to determine the mass of K2C2O4 in the sample and divide it by the total mass of the sample, then multiply by 100.

**Percentage Composition:**

Given:

- Mass of the sample = 1.000 g

- Molar mass of K2C2O4 = 166.21 g/mol

First, calculate the moles of K2C2O4 in the sample:

- Moles of K2C2O4 = Mass of K2C2O4 / Molar mass of K2C2O4

Next, calculate the mass of K2C2O4 in the sample:

- Mass of K2C2O4 = Moles of K2C2O4 * Molar mass of K2C2O4

Finally, calculate the percentage composition:

- Percentage composition of K2C2O4 = (Mass of K2C2O4 / Mass of the sample) * 100

The percentage composition of K2C2O4 in the sample is 100%.

For the normality of the KMnO4 used in the titration, use the balanced chemical equation and the volume and concentration of KMnO4 used.

**Normality:**

Given:

- Volume of KMnO4 used = 40.00 mL = 0.04000 L

- Concentration of KMnO4 = 0.0200 M

From the balanced chemical equation, determine the normality of KMnO4:

- Normality of KMnO4 = 2 * concentration of KMnO4

The normality of KMnO4 used in the titration is 0.0400 N.

To calculate the ppM of K+ in the sample, determine the mass of K+ in the sample and divide it by the mass of the sample, then multiply by 1,000,000.

**ppM of K+:**

Given:

- Molar mass of K+ = 39.098 g/mol

Calculate the moles of K+ in the sample:

- Moles of K+ = Moles of K2C2O4 * (2 moles of K+ / 1 mole of K2C2O4)

Next, calculate the mass of K+ in the sample:

- Mass of K+ = Moles of K+ * Molar mass of K+

Finally, determine the ppM of K+:

- ppM of K+ = (Mass of K+ / Mass of the sample) * 1,000,000

The ppM of K+ in the sample is 469,000 ppM.