April 28, 2024, 12:00:40 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: What is the percent purity?  (Read 6521 times)

0 Members and 1 Guest are viewing this topic.

Offline FLgirl

  • Regular Member
  • ***
  • Posts: 25
  • Mole Snacks: +0/-4
What is the percent purity?
« on: October 05, 2012, 04:22:39 AM »
A 0.85 g sample of commercial lye (containing NaOH and other inert ingredients) is dissolved in water and titrated with 37.00 ml of 0.525 M HCl. What is the percent purity (mass of NaH/mass of sample x 100) of the lye sample?

Please just help me answer so I can turn in my lab report.. I will learn how to calculate it when I am not so stressed in my personal life. (hopefully soon) I can't focus on schoolwork without feeling super anxious so yes I'm doing the irresonsible thing and want the answer to 1 question so I don't fail lab.
Logged

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27665
  • Mole Snacks: +1801/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: What is the percent purity?
« Reply #1 on: October 05, 2012, 04:31:14 AM »
What is the reaction equation?

See http://www.titrations.info/titration-calculation for the explanation of how to find amount if titrated substance. Then it is just converting moles to mass and plugging it into the formula given.
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline Dan

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 4716
  • Mole Snacks: +469/-72
  • Gender: Male
  • Organic Chemist
    • My research
Re: What is the percent purity?
« Reply #2 on: October 05, 2012, 04:31:36 AM »
Start by writing a balanced equation for the titration reaction. From that, can you see how to calculate the amount of NaOH present in the sample?
Logged
My research: Google Scholar and Researchgate
Pages: [1]   Go Up
« previous next »
Sponsored Links