Indicators and pH - Understanding the Science Behind Acids and Bases
This article delves into the fascinating world of acids and bases, exploring how indicators help to identify whether a substance is acidic or basic. We start by defining
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Slide1Indicators and pHT o l e a r n a b o u t p H a n d h o w i n d i c a t o r s s h o w a s u b s t a n c e t o b e a n a c i d o r a b a s e . Objective:
Slide2Research: Acid: solutions – high concentration of H 3 O + ions. Hydronium Base: solutions – high concentration of OH - ions. Hydroxyl pH: percent of hydrogen – how acidic it is.
Slide3pH scale: series of numbers 0-14. 7= neutral, 0-6 acid, 8-14 base. Indicator: substance that shows a definite color change when mixed with acid or base.
Slide4 Effect on Acids Effect on Bases Blue litmus paper: pink ___ Red litmus paper: ___ blue Phenolphthalein: stays clear shocking pink Bromthymol blue: orange ___ Congo red: blue ___ • As the pH of a solution changes, the indicator shows a specific color change.
Slide5Pr o c e d u r e I – A c i d A f t e r e a c h s t e p , r e c o r d y o u r o b s e r v a t i o n s . Drop a small drop of HCl onto blue litmus paper. Drop a small drop of HCl onto red litmus paper. Place a small amount of HCl into test tube A. Add 1 drop of phenolphthalein. Rinse TT. Place a small amount of HCl into test tube A. Add 2 drops of bromthymol blue. Rinse TT. Place a small amount of HCl into test tube A. Add 1 drop of congo red. Rinse TT.
Slide6Pr o c e d u r e I I – B a s e A f t e r e a c h s t e p , r e c o r d y o u r o b s e r v a t i o n s . Drop a small drop of NaOH onto blue litmus paper. Drop a small drop of NaOH onto red litmus paper. Place a small amount of NaOH into test tube B. Add 1 drop of phenolphthalein. Rinse TT. Place a small amount of NaOH into test tube B. Add 1 drop of bromthymol blue. Rinse TT. Place a small amount of NaOH into test tube B. Add 1 drop of congo red. Rinse TT.
Slide7Reaction withAcid Base Blue litmus paper Red litmus paper Phenolphthalein Bromthymol blue Congo red
