Solving Potassium Dichromate Homework Problem

In summary, to find the number of grams of potassium dichromate present in a 1 L N/10 solution in acid medium, we use the equation gram eq = NV = g/E = xg/M, where N is the normality of the solution, V is the volume in liters, E is the equivalent weight, and M is the molecular weight. Using this, we can calculate the gram equivalent to be 0.1, and then use the equation g = gram eq * mol wt / valence factor to find that there are 2.1 grams of potassium dichromate present. To proceed further, we use the equation gram eq = no. of grams / Equ. wt to find the equivalent weight, E
  • #1
Quantum Mind
72
0

Homework Statement


How many grams of potassium di chromate (K2Cr2O7) are present in 1 lit of its N/10 solution in acid medium?

Homework Equations



gram eq = NV = g/E = xg/M

The Attempt at a Solution



gram eq = NV = 0.1 * 1 = 0.1

g = gram eq * mol wt / valence factor (The valence factor I have taken as 14 because there are 7 oxygen atoms in potassium dichromate, which means in acidic solution there would be 14 H+ atoms)

0.1 * 294 / 14 = 2.1

How to proceed beyond this? The answer is one of the four:4.9, 49, 0.49, 3.9.
 
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  • #2
OK, got it.

gram eq = no. of grams / Equ. wt

E = mol. wt/val factor = 294.2 / 6 = 49

g.e * E = 4.9.

Is this the answer?
 
  • #3
Looks OK to me.
 

FAQ: Solving Potassium Dichromate Homework Problem

1. What is Potassium Dichromate?

Potassium Dichromate (K2Cr2O7) is a chemical compound commonly used as an oxidizing agent in various industrial processes. It is a bright orange, crystalline solid and is highly soluble in water.

2. What is the purpose of solving Potassium Dichromate homework problems?

Solving Potassium Dichromate homework problems helps students understand the principles of chemical reactions and stoichiometry. It also helps them practice their problem-solving and critical thinking skills.

3. What are the steps involved in solving a Potassium Dichromate homework problem?

The steps involved in solving a Potassium Dichromate homework problem include writing out the balanced chemical equation, determining the limiting reagent, calculating the moles of reactants and products, and converting between units as needed.

4. What are the common mistakes made when solving Potassium Dichromate homework problems?

Common mistakes when solving Potassium Dichromate homework problems include incorrect balancing of the chemical equation, miscalculating the number of moles, and forgetting to convert between units.

5. How can I improve my problem-solving skills for Potassium Dichromate homework problems?

To improve your problem-solving skills for Potassium Dichromate homework problems, it is important to practice regularly and seek help from your teacher or peers when needed. You can also review the basic principles of stoichiometry and familiarize yourself with common mistakes to avoid them in the future.

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