Chem Empirical Formula of a Hydrate Formal Lab
Student:
Glavin Wiechert
Group Member: Victoria Coe
Due Date: May 2, 2011
Teacher: Louth, Ellen Mary
Class: Chemistry 11 Ad
Introduction:
An empirical formula of a chemical compound is the ratio of atoms in simplest wholenumber terms of each present element in the compound. For example, Glucose is
C
H
O
; it’s empirical formula is CH
O.
6
12
6
2
A hydrate is a compound that is chemically combined with water molecules. In contrast, an anhydrate does not contain water, and has had all of its water removed. Purpose:
The purpose of this experiment is to identify the unknown hydrate, selected by your teacher. Apparatus:
Evaporating dish
Hot plate
Scale
Gauze mat
Tongs
Scoopula
Materials: barium chloride (BaCl
) → hydrate crystals
2
Procedure: 1. First, preheat your evaporating dish on a hot plate for two to three minutes. Your dish should be clean and dry before use.
2.
3.
4.
5.
6.
7.
8.
After your evaporating dish is heated, let it cool for at least three minutes. Use your tongs to move the dish to a suitable cooldown location. Once you dish has cooled down enough for touch put it on a scale.
a. Find the mass to the nearest 0.01g. Obtain about 2 grams of a sample hydrate (e.i. barium chloride). Make observations and then carefully transfer the crystals to your crucible or evaporating dish. Mass and record the dish with the hydrate crystals (BaCl
) to the nearest 0.01g.
2
Place the evaporating dish on the hot plate and heat gently until the water has been driven off (Heat until there is no more popping or spattering). Allow the dish to cool. When the dish is cool enough to touch, transfer it to a scale and find the mass. To make sure all the water is driven off, heat the dish another time (Repeat step 6 & 7).
a. (Step 7) Cool and find the mass. If the results do not agree within
Glavin Wiechert
Group Member: Victoria Coe
Due Date: May 2, 2011
Teacher: Louth, Ellen Mary
Class: Chemistry 11 Ad
Introduction:
An empirical formula of a chemical compound is the ratio of atoms in simplest wholenumber terms of each present element in the compound. For example, Glucose is
C
H
O
; it’s empirical formula is CH
O.
6
12
6
2
A hydrate is a compound that is chemically combined with water molecules. In contrast, an anhydrate does not contain water, and has had all of its water removed. Purpose:
The purpose of this experiment is to identify the unknown hydrate, selected by your teacher. Apparatus:
Evaporating dish
Hot plate
Scale
Gauze mat
Tongs
Scoopula
Materials: barium chloride (BaCl
) → hydrate crystals
2
Procedure: 1. First, preheat your evaporating dish on a hot plate for two to three minutes. Your dish should be clean and dry before use.
2.
3.
4.
5.
6.
7.
8.
After your evaporating dish is heated, let it cool for at least three minutes. Use your tongs to move the dish to a suitable cooldown location. Once you dish has cooled down enough for touch put it on a scale.
a. Find the mass to the nearest 0.01g. Obtain about 2 grams of a sample hydrate (e.i. barium chloride). Make observations and then carefully transfer the crystals to your crucible or evaporating dish. Mass and record the dish with the hydrate crystals (BaCl
) to the nearest 0.01g.
2
Place the evaporating dish on the hot plate and heat gently until the water has been driven off (Heat until there is no more popping or spattering). Allow the dish to cool. When the dish is cool enough to touch, transfer it to a scale and find the mass. To make sure all the water is driven off, heat the dish another time (Repeat step 6 & 7).
a. (Step 7) Cool and find the mass. If the results do not agree within