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Copy of Final Chemistry Paint Project

Paint Project Final

Kimberly Escarcega

on 28 November 2012

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Transcript of Copy of Final Chemistry Paint Project

Purpose Questions Hypothesis Paints Further Investigation Background A precipitate is the formation of a solid in a solution or inside another solid during a chemical reaction. In order to synthesize an inorganic pigment, a precipitate is needed. This is created by mixing two substances together to create an insoluble precipitate. Once formed, it must be filtered out of its original solution and dried. Once dried, the pigment can be crushed and mixed with a binder in order to create a paint. The purpose of this experiment was to synthesize an inorganic pigment to be used to create the best possible paint. How do you synthesize a precipitate?

What is the best combination of precipitate and binder to create the best possible paint?

It is important to know how to synthesize a precipitate because creating a paint would be impossible without one. Making the best possible paint is important because paints are used in every day life. Chemistry Lab Paint Final If we mix Copper(II) Nitrate and Potassium Carbonate together and run it through a filter, then we will be left with a blue precipitate
If we mix the precipitate with 4 different binders such as linseed oil, acetone, hexane and egg yolk then the egg yolk and linseed oil mixture will create the best paint based on spread ability, appearance, scratch resistance, and sun resistance. Paint #1: 2 mL egg yolk
Paint #2: 2 mL linseed oil
Paint #3: 1 ml Acetone, 1mL linseed oil
Paint #4: 1 mlHexane, 1mL linseed oil
Paint #5: 1.5mL Hexane, .5mL linseed oil
Paint #6: .5 mLHexane, 1.5mL linseed oil Next time, the problem can be investigated further simply by running more tests of different substances to create different types of pigments. Then of course adding different materials to test the paint on. BY:Courtney, Kimberly, Tyler, Natalia Spread Ability The first thing observed was each paint’s ability to be painted to a white sheet of paper.
Paint #1: Hard to spread, very clumpy
Paint #2: Easy to spread, not many clumps,
Paint #3: Some clumps, does not spread very easily
Paint #4: Some clumps, does not spread very easily
Paint #5: Not clumpy, easy to spread
Paint #6: A few clumps, easy to spread Appearance Another important aspect of paint are its aesthetic qualities and how it appears on a piece of paper
Paint #1: Green in color, appears thick and clumpy
Paint #2: Turquoise in color, surrounded by oil that has escaped the paint
Paint #3: Weak turquoise color, somewhat grainy
Paint #4: Weak turquoise color, otherwise grainy
Paint #5: Turquoise in color, smooth, good quality
Paint #6: Turquoise in color, grainy, surrounded by excess oil Scratch Resistance A paint’s ability to resist scratches is important because the surfaces paints are on are most likely prone to scratches and abuse
Paint #1: Easily scratched off the paper using a nail.
Paints #2-#6: Paints #2-#6 were all scratch resistant and did not scratch off the paper Sun Resistance A paint should be resistant to the sun and should not fade in color with exposure to the sunlight
Paint #1: Paint #1 did not fade with exposure to sunlight
Paint #2-#6: Paints #2-#6 all faded from a turquoise color to a green color with exposure to sunlight. Evaluation of Paint Paint #1
-made with egg yolk
-not easily spread, clumpy appearance, scratches easily, resistant to sunlight
Paint #2
-made with linseed oil
-easily spread, appears very oily (oil is seen on paper), resistant to scratches, color fades in sun Evaluation of Paint Paint #3
Made with 1:1 ratio of acetone and linseed oil
Not easily spread, smooth appearance, resistant to scratches, fades in sunlight
Not easily spread, grainy appearance, resistant to scratches, fades in sunlight
Paint #4:
-1:1 mixture of hexane and linseed oil
-not easily spread, grainy appearance, resistant to scratches, fades in sun

Paint #4 appears to be the best paint of these first 4 paints, therefore two more paints were made with a combination of hexane and linseed oil Evaluation of Paint Paint #5
-2:1 mixture of hexane and linseed oil
-spread easily, smooth appearance, scratch resistant, fades in sunlight
Paint #6:
-1:2 mixture of hexane and linseed oil
-easily spread, oily appearance, scratch resistant, fades in sunlight Best Paint Paint #5, the 2:1 mixture of hexane and linseed oil is the best paint because it isn't clumpy and it was easy to spread. It had a nice turquoise color with a great, smooth quality.It was also scratch resistant. The only negative is that it faded in the sun but most of the paints tested did.The tests and results of our paint shows that Paint#5 was the most successful based on the quality tests explained. Improvement Some things that could have improved our experiment are:
-Having more pigment in order to run more tests
-Utilizing more materials to test the paint on to check quality
-Adding more paint quality tests to ensure that we are choosing the correct paint Experimental Design From the chemicals provided in the lab, copper
nitrate and potassium carbonate were selected as the
reactants in the precipitate reaction.

• The following equation was balanced and CuCO3 was
identified as the precipitate and potential pigment
Cu(NO3)+K2CO3 ---> CuCO3+2KNO3
• The mole ratios and stoichiometry were then used to
calculate the amount(in grams) of reactants needed to
yield 0.3g of pigment. To ensure enough pigment was
synthesized for thorough testing, the calulations were
made to yield 0.5 grams of pigment. Experimental Design Continued Week 1 Procedure:

– Reactants were measured using the electronic balance
– A beaker was filled with approximately 150 mL of distilled
– The reactants were added to the water and stirred using a
plastic spatula until dissolved and allowed to sit for a few
minutes until a forming precipitate was clearly seen.
– A vacuum filtration system was set up and used to filter
the precipitate from the liquid.
– Precipitate was left in the lab to dry until the following
week Experimental Design Week 2 Procedure
– The dried pigment was ground into powder using
a mortar and pestle
– The pigment was then mixed with different
binders to create five different paints
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