SALE . . . $8.50 . . . Save 50% . . . The PERFECT LAB . . . especially for a TEACHER OBSERVATION LESSON . . . the teacher DEMONSTRATES acids, bases, salts with BOILING PURPLE (red) CABBAGE to visually create a pH scale . . . THEN . . . STUDENTS engage in a LAB ACTIVITY on ACID RAIN. You can S-T-R-E-T-C-H the lab activity out to a WEEK and END lab with a WRITTEN INVESTIGATIVE REPORT on the Effect of Acid Rain on the Local Environment ( a real-world application). CHEAP . . . LOW COST for household materials. HURRY! GET THIS LAB NOW!!! 13-PAGES. NO PREP . . . PRINT. KIDS WILL LOVE IT!!! ENGAGING . . . DURATION = 1-week. Limited time offer! Hurry!