# Chemistry

I'm doing an Equivalent Weight and Normality experiment and I got very confused on the discussion questions.[ the unknown is titrated with the KMnO4]

1) In this experiment MnO4- is reduced to Mn2+ by the unknown. What is the equivalent weight of MnO4- for this experiment.

Given: Molarity of KMnO4 : 0.079812M
amount of unknown: 1mL
Change in volume of titration: 26.01mL

1. 👍 0
2. 👎 0
3. 👁 43
1. The equivalent weight is the molar mass (molecular weight) divided by the change in the number of electrons in the titration. The molar mass of KMnO4 is approximately 158 (You need to check it out to get an exact number) and the change in the number of electrons is 5. Mn in MnO4^- is +7 and in Mn^+2 it is +2. From 7 to 2 is 5. One thing confusing about equivalent weights is that a substance can have more than one; for example, KMnO4 can have an equivalent weight = 158/5 in this reaction but if it was carried out in a neutral or basic solution, KMnO4 goes to MnO2 which is a change from +7 to +4 and the equivalent weight is 158/3.

1. 👍 0
2. 👎 0
posted by DrBob222
2. If 2 moles of electrons are required to oxidize 1 mole of unknown, what is the molarity of the unknown solution??

is the molarity reduce to half??

1. 👍 0
2. 👎 0
posted by Confused

## Similar Questions

1. ### chem

(5) In this experiment MnO4-is reduced to Mn 2+ by the unknown. What is the equivalent weight of MnO4- for this experiment? 52.68 (6) How many equivalents of electrons were transferred from the unknown solution? (7) What is the

asked by bry on October 27, 2011
2. ### science

20 g of K3PO4 dissolved in 350 ml water,to come up with 500 ml solution. calculate : molecular weight Equivalent weight molarity normality molality

asked by doa'a on February 27, 2015
3. ### Normality headache

I do not fully grasp the idea of Normality. What are the normality and the molarity of a sulfuric acid solution if 30mL of it are required to completely neutralize 24mL of 0.02N NaOH? (one of them, N or M, is never equation

asked by Kizner (chem) on June 16, 2006
4. ### chemistry - (Dr. Bob222)

A student attempted to synthesize malonic acid which has a molecular weight of 104 g/mol by the same method used to synthesize aspirin. A titration was performed to find the equivalent weight. 0.125 g of malonic acid product was

asked by Ana on April 21, 2014
5. ### Chemistry

I wanted to calculate the normality of the acid and base solutions for a lab. But I'm extremely confused. I know normality is number of equivalents divided by volume in liters. But are we suppose to be given the number of

asked by Priscilla on March 3, 2012
6. ### Chemistry

A sample of a curium isotope was roasted. It was determined that the product( curium oxide) contained 11,59% of oxygen.¿ What is the equivalent weight of the isotope in the oxide? ¿ What is the mass of the curium isotope? I have

asked by Francis on June 18, 2017
7. ### Chemistry

I wanted to calculate the average equivalent weight of an unknown acid for an acid-base titration experiment. The mass of the unknown that I had to obtain is 0.2 g and the equivalents of the acid is .001046 L x N. But is this

asked by Priscilla on March 5, 2012
8. ### Chemistry

HELP!! I'm doing an experiment to do with phosphorus and plant food and MgNH4P04 6H20 my air dry weight of MgNH4P04 6H20 was 1.31 g grams of P in plant food was .165 g % P in plant food is 13.87% % P205 equivalent to % P above is

asked by Alyssa on April 25, 2014
9. ### chemistry

To prepare the titrant fo amonia nitrogen analysis an analyst weight out 1.20 grams of concentration 98% sulfuric acid and brings to 1000 ml in lab pure water. if the molecular weight is 98 calculate the normality of the solution

asked by Faye on March 26, 2011
10. ### RepostedLiterature question

I asked this question a couple of days ago, and wanted to post what my text states.Several agreed (B) was the best answer to the question. After sharing a book with a group of children, the teacher should always: A. determine if

asked by Anonymous on September 11, 2007

More Similar Questions