Other
CHEM2032A LABA4
- Institution
- University Of The Witwatersrand (wits)
CHEM LAB A4
[Show more]
Content preview
NAME: NOSIBUSISEKOZULU
STUDENT NO: 2448387
MODULE: CHEM2032A
TITLE: DETERMINING
THE CONCETRATION OF
SULPHATE IN EPSOM
SALT.
, Objective
To determine the number of moles of water associated with one mole of magnesium sulphate,
MgSO4, in Epsom salt.
AIM
The aim of this experiment is to obtain the concentration of sulphate in the Epsom salt using
gravimetric method.
1. INTRODUCTION.
Epsom salts are hydrated magnesium sulphate, and their formula is sometimes written as
MgSO4.xH2O. When Epsom salts are heated, their water of crystallisation is driven off, leaving
anhydrous magnesium sulphate. Epsom salt was used because BaSO4 is not soluble in water. If the
amount of BaCl2 added to the sample is known, determining the mass of the barium sulphate
precipitate permits calculation of the amount of sulphate in the solution which can, them be related
to the concentration of MgSO4.7H2O (Epsom salt).
By weighing the hydrated and anhydrous magnesium sulphate before and after heating, it is possible
to find the mass of MgSO4 and the mass of H2O in a sample of Epsom salts. From these masses, the
number of moles of water associate with one mole of MgSO4 can be determined. This laboratory
experiment is carried out with a purpose of attaining how much concentration of sulphate does the
Epsom salt contain. The sulphate concentration of the Epsom salt was analysed gravimetrically by
converting the sulphate in the weighed Epsom salt to barium sulphate. The precipitate barium
sulphate is carefully filtered, washed with hot water, ignited at red heat, and weighed as barium
sulphate.
Ba2+(aq) + SO4(aq) BaSO4(s)……. (1)
This experiment was done using gravimetric analysis. It is of paramount importance to obtain the
concentration of sulphates. Gravimetric method is by the quantitative determination of the mass of
anhydrous Barium Sulphate precipitate. Barium sulphate precipitate is form when Barium Chloride is
added excessively to a hot given Sulphate solution slightly acidified with concentrated Hydrochloride
acid.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller aphiwemvubu25. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R133,00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
52928 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now