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Alkaline Substance: Sodium Hydroxide
Observations: The color changed dramatically at the first hint of NaOH addition, from a deep blue to a greenish yellow. When the NaOH was strirred vigourously (for 5 minutes) and heated, the color got lighter and lighter, finally turning yellow on the rims and edges, but remaining a deep blue in the center of the beaker. The smell of this mixture is overpowering. The stench grew as the temperature of the dyevat rose.
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pH turned: A very distinctive 14 almost immediately. (pH was measured in its primary solution state, with the NaOH suspended in water alone. This pH reading is prior to mixing with the indigo solution.)
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| Sample 2 |
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Alkaline Substance: Potash
Observations: The color did not change signifigantly, at first or even later, with the addition of potash. With the addition of heat, the mixed substance just simmered and sepreated, with the chunks of potash almost refusing to mix with the indigo and form any sort of chemical reaction. The smell of this mixture was not that overpowering, as was expected.
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pH turned: A lukewarm 7, neutral. This could indicate the reason that nothing happened when the sodium hydrosulfite was sifted over the top of the vat, since potash proved to not be enough of an alkaline agent.
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| Sample 3 |
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Alkaline Substance: Lime (CaCO3)
Observations: The color change was rather gradual, but with a rise in temperature and enough stirring the color did evenutally turn a murky blue-green, with a hint of yellow skimming the surface and rims of the beaker. The addition of sodium hydrosulfite yielded an interesting smell, a mixture of rotton eggs and horse manure, although the smell was not as overpowering as the NaOH sample had been.
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pH turned: Around 9, slightly basic. Lime was an intermediate compromise in pH between the two other variable solutions.
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