Exp. Observation of Chemical Changes
Name: Jocelyne Munguia|Date: 6/12/13|
Exp 1: Observations of Chemical Changes|Lab Section: 75426|
Data Tables:
Part 1:
|Chemicals|Well No.|Observations of the Reaction|
A.|NaHCO3 + HCl|A2|Tiny bubbles formed around the edges. Under white paper it looked transparent, but under black paper there was some white in the middle. |
B.|HCl + BTB|A3|The mixture turned yellow instantly. Under white paper the mixture was more of mustard yellow and under black paper it was less of a bright yellow. |
C.|NH3 + BTB|A4|The mixture is a lighter royal blue under white paper and a darker royal blue under black paper. The mustard yellow would be an acidic indicator and the royal blue a basic indicator. |
D.|HCl + blue dye|A5|The mixture also turned green instantly. Under white paper it is a nice emerald color and slightly darker under black paper. |
E.|Blue dye + NaOCl|A6|The mixture is fairly similar to NH3+BTB. It’s a little lighter under white paper, but about the same under black paper. |
| with the 1 drop of HCl||After adding HCl the mixture turned into a forest green. But under white paper the edges were a turquoise color while the middle was still blue/green. Under black paper and good lighting the blue stood out more.|
F.|NaOCl + KI|A7|The mixture remained a clear color. No significant change after adding starch and under black and white paper. |
| with 1 drop of starch||After a while the clear color fogged a bit but not significantly. |
G.|KI + Pb(NO3)2|A8|A thick bright yellow gradually took over the mixture. Under white paper the mixture appears thick almost yolk like. Under black paper you can see the color pop from the rest of the mixtures. Became a precipitate. |
H.|NaOH + phenolphthalein|A9|The NaOH was clear, but as soon as it was dropped into the well it turned a very light pink and after mixing it with phenolphthalein it turned into a strong sort of fuchsia pink. It looks about the same under black and white paper. |
I.|HCl + phenolphthalein|A10|The
Exp 1: Observations of Chemical Changes|Lab Section: 75426|
Data Tables:
Part 1:
|Chemicals|Well No.|Observations of the Reaction|
A.|NaHCO3 + HCl|A2|Tiny bubbles formed around the edges. Under white paper it looked transparent, but under black paper there was some white in the middle. |
B.|HCl + BTB|A3|The mixture turned yellow instantly. Under white paper the mixture was more of mustard yellow and under black paper it was less of a bright yellow. |
C.|NH3 + BTB|A4|The mixture is a lighter royal blue under white paper and a darker royal blue under black paper. The mustard yellow would be an acidic indicator and the royal blue a basic indicator. |
D.|HCl + blue dye|A5|The mixture also turned green instantly. Under white paper it is a nice emerald color and slightly darker under black paper. |
E.|Blue dye + NaOCl|A6|The mixture is fairly similar to NH3+BTB. It’s a little lighter under white paper, but about the same under black paper. |
| with the 1 drop of HCl||After adding HCl the mixture turned into a forest green. But under white paper the edges were a turquoise color while the middle was still blue/green. Under black paper and good lighting the blue stood out more.|
F.|NaOCl + KI|A7|The mixture remained a clear color. No significant change after adding starch and under black and white paper. |
| with 1 drop of starch||After a while the clear color fogged a bit but not significantly. |
G.|KI + Pb(NO3)2|A8|A thick bright yellow gradually took over the mixture. Under white paper the mixture appears thick almost yolk like. Under black paper you can see the color pop from the rest of the mixtures. Became a precipitate. |
H.|NaOH + phenolphthalein|A9|The NaOH was clear, but as soon as it was dropped into the well it turned a very light pink and after mixing it with phenolphthalein it turned into a strong sort of fuchsia pink. It looks about the same under black and white paper. |
I.|HCl + phenolphthalein|A10|The