Featured in PASCO’s College Chemistry Instructor Guide

College Chemistry Instructor Guide

(PS-3803A)

College Instructor edition with 36 experiments covering introductory and general chemistry topics.

Determination of Precipitate

Lab Summary

Use a stainless steel temperature sensor with gravimetric analysis to determine the amount of sulfate in a sample of an unknown alkali sulfate.

Theory

In this activity, students use gravimetric analysis to determine the amount of sulfate in a sample of an unknown alkali sulfate.

Method

Students gain experience conducting the following procedures:

  • Isolating sulfate from an unknown sample by precipitation with barium chloride.
  • Collecting, drying, and obtaining the mass of the precipitate.
  • Calculating the amount of sulfate in the unknown from collected data.

Sensors / Equipment Used:

PASPORT Chemistry Sensor

(PS-2170)

Allows students to measure Temperature, pH/ISE/ORP, Absolute Pressure & Voltage in one sensor. For use with PASPORT Interfaces.

Materials Used:

Ring stand with ring 
Clamp, utility 
Clamp, buret 
Crucible with lid 
Tongs 
Beaker, glass, 400-mL 
Beaker, glass, 250-mL 
Beaker, 25-mL - 3
Beaker or flask, 400-mL, 
Graduated cylinder, 100-mL 
Graduated cylinder, 10-mL 
Buret, 50 mL 
Funnel 
Dropper 
Hot plate 
Bunsen burner 
Clay triangle 
0.5 M Barium chloride (BaCl2) - 30 mL
0.1 M Silver nitrate (AgNO3) - 5 mL
6 M Hydrochloric acid (HCl) - 5 mL
Unknown alkali sulfate (use K2SO4 and Na2SO4) - 0.35 g
Filter paper, Whatman® Ashless, #42 
Rubber policeman and stirring rod 
Watch glass, 100-mm 
Distilled water 100 mL
Wash bottle with distilled water 

The Associated Bundle:

Advanced Chemistry Standard Sensor Bundle

(PS-2928A)

Contains the probeware for completing experiments in the College Chemistry lab manual.

Interface Required

This experiment may require software and an interface for data collection.