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In this part of the acids and bases lab, you will test five different solutions (H₃PO₄, NaH₂PO₄, Na₂HPO₄, Na₃PO₄, and HNO₃) with an indicator called BTB (bromthymol blue).

After you have tested each solution, you will be able to see what happened in each solution on a molecular level to cause the color change.