Indicators

Our investigation of the mysterious powder is winding down.  This week, we have spent a lot of time with indicators and our 6 colored powders.  We used iodine to indicate a starch, phenolphthalein to indicate a base, and phenol red to indicate an acid.  This helped us to identify the green powder as a starch, the red powder as a base, and the blue powder as an acid.  We are anxious to try these tests again with the mysterious powder to see if it contains a starch, acid, or base.