Laboratory reports

Páginas: 8 (1801 palabras) Publicado: 12 de septiembre de 2012
Chemistry I Name: Gretel Reyes Schuldes__________ ID: 323684____________
Lab 2 Date: _12/09/12_____________ Room: _1107_________
“Acid Rain effect over Calcium Carbonate”
Knowledge Objectives:
-To determine the effect of Acid over Calcium carbonate.
-Analyze the effect of Acid Rain on a simulated calcium structure.

Experimentation Objectives:
-Manipulate: Handlean object with bare hands or any other instrument.
-Variable identification: Identifies clearly Dependant, Independent and Controlled Variables.
-Data processing: Transforms Original Data through procedures, formulas, algorithms, etc., and presents them in tables and graphs, interpreting them and getting conclusions .

During this experiment the object we try to achieve is tosee is there is an effect of acid rain over calcium carbonate and analyze what is the effect of acid rain on a simulated carbonate structure. To see this we are going to use a chalk which is made from calcium carbonate and we are going to put 3 in acid and 3 in water and see if there is any physical or chemical change and also we are going to measure the weight.
To do this experiment we need toknow what is acid rain, how it is made of, which are the different types of acid rain, etc. This is why before we made any experiment we investigated more deeply to know of what we are talking about.

Key concepts:
* Definition of Acid Rain
* Chemical Reactions involved
* Different types of Acid Rain
* Problem Definition
Variations of Acid Rain depending on the geographicalRegions.

When sulfurous, sulfuric, and nitric acids in polluted air react with the calcite in marble and limestone, the calcite dissolves.

Investigation Question

Will this happen when a piece of chalk is submerged into a nitric acid solution?

Materials and reactants

dissection tweezers
6 250 mL beakers
1 mL pipette
1 wash bottle
6 watchglass or filter paper

Nitric acid 10% v/v
Distillated water
3 piece of chalk

1 100 ml Volumetric Cylinder
1 Digital Scale

Safety equipment:
Safety goggles
Laboratory coat
Experimental Variables:
Independent variable (x) Is the variable we determine to change to observe the result in the experimentation.

Dependent variable (y) Is the variable we record as theresult of the experimentation affected by certain conditions.

Which are the the variables involved in this experiment.

Independent variable (x) = __time elapsed in minutes______________

Dependent variable (y) = ___weight of the chalk in grams___________

There are variables in the need to be controlled for the results not to be affected by others than our dependent and independent .Remember in an experiment everything must be controlled; only the independent variable is set to change.

List the controlled variables in the experiment:
a) ___Amount of water________________________
b) __Person who measures the weight___________
c) __Same substances_________________________

Write a Hypothesis:

Nitric acid will make the chalk thinner and lose weight while the water won’tmake any effect in the chalk.


1. Mark each beaker to identify them as: water 1, water 2, water 3, acid 1, acid 2 and acid 3.
2. Split each piece of chalk in two halves
3. For beakers marked as water 1 , water 2 and water 3 follow the next procedure:
a. Weight one half piece of chalk; register the data in table 1 on minute 0.
b. Slide each piece of chalk inits corresponding beaker.
c. Repeat this for the other pieces of chalk.
4. For beakers marked as acid 1 , acid 2 and acid 3 follow the next procedure:
a. Weight one half piece of chalk, register the data in table 1 on minute 0
b. Slide each piece of chalk in its corresponding beaker
c. Repeat this for the other pieces of chalk
5. You should have a total of 6 beakers...
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