Quote:
Originally posted by lafemmefatale
So my question is if the pH was 1.3 or 1.2 or 1...would the colour be red? Likewise, at 2.9 or 3, would the colour be yellow?
Also, if the pH is 2, is the colour something like...orange?
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yes and yes
You have the right idea. Think of the litmus paper, which is a pH indicator with a very wide range -- it's the gradual change in color that enables you to determine the pH. With other indicators, the change is more abrupt, so you're less likely to see the intermediate colors.
I'm surprised you haven't had some sort of demonstration of pH indicators in class...