pH indicating soap bubbles (Ben Krasnow - new channel name!) @AppliedScience

Applied Science | pH indicating soap bubbles (Ben Krasnow - new channel name!) @AppliedScience | Uploaded 10 years ago | Updated 23 hours ago
I thought it would be cool to have a colored soap bubble that responded to changes in pH. I concentrated some phenol red (pH indicator), and mixed it with commercial bubble solution. Unfortunately, it was not dense enough to actually show its color. While investigating this, I noticed that normal soap bubbles lose their color as they become thinner (due to evaporation) and eventually burst. I tried to get footage of this color loss, but the bubble will not stay in the same place! I started to develop a method to partially fill the bubble with helium to make it neutrally buoyant.

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$Use an oscilloscope to collect optical spectral data Im using my new Tek oscilloscope to collect data from a DIY spectrometer. The scope is in X-Y mode with infinite persistence. The X axis is controlled by the rotational position of the diffraction grating in the spectrometer, and the Y axis is controlled by the photomultiplier tube, which is detecting the spectra. In this video, I discuss the scope setup, and in future videos, I will talk more about the spectrometer, and how to use it.$

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