Question

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
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.
Of course since it is white it could be reflecting some light also.

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