Page 43

C. To a third test tube, add 25 drops of acetone until a permanent color change occurs. Record observations. D. To a fourth test tube, add 5 drops of silver nitrate, AgNO 3 , one at a time. Gently swirl to mix. Record observations. 
 8. To the solution remaining in the beaker, add distilled water to get a purple color, about half way between the blue and pink. Place the beaker on a hot plate until a color change occurs. Record observations. 
 9. Chill the beaker in an ice bath to see if the color change is reversible. Record observations. 
 Observations: 
 step 4: Ethanol and cobalt chloride solution is a dark blue color. 
 step 6: Changed from deep blue to to deep purple, then to pink. 
 step 7a: Solution turned light blue, then settle to a dark blue at the bottom. 
 step 7b: Calcium chloride turned a light blue and the solution around it turned a dark blue. 
 step 7c: Solution turned a dark purple. then turned dark blue, then dark purple. 
 step 8: Turned a dark blue when heated 
 step 9: Returned to a pink when chilled.