You don't understand why placing an opaque substance in the solution cuts down on the light getting through?
Look at a light. Now place your hand in front of your eyes. Can you see the light? Why not? Because your hand is in the way; i.e., it absorbs all of the light before it gets to your eyes.
how would the presence of a white solid in a solution effect the solution's absorbance? it made its absorbance higher, but i'm not too sure why
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Of course since it is white it could be reflecting some light also.
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