litmus and ph paper use
TRANSCRIPT
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Lab: Acids, Bases, & pH
Purpose: Use litmus paper to determine if a variety of
solutions are acids or bases. Use pH paper and cabbage
juice indicator to determine the pH of the solutions.
Hypothesis:
Solution Acid or Base? pH?
Water
Coca-Cola
Ammonia
(diluted
!leach (diluted
"il#
"aalo$
%inegar&range 'uice
!a#ing oda (in
)ater
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Background Info:
*itmus paper can be used to determine if a solution is an
acid or a base.
Acid + blue litmus paper turns red
!ase + red litmus paper turns blue
,eutral + blue litmus stays blue red litmus stays red
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pH scale + scale from (most acidic to /0 (most basic. 1
neutral
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pH paper + used to determine pH
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Procedure and aterials:
aterials:
/ red and blue litmus paper (2 of each then tear in
half3 pH paper (2 tear in half
4 forceps
0 5yedropper
2 plastic / m* )ells
6 )ater
1 Coca-Cola
7 Ammonia8 !leach
/ "il#
// "aalo$
/3 &range juice
/4 %inegar
/0 !a#ing oda
/2 9aper to)el
/6 oggles and apron
/1 Cabbage juice indicator
Procedure:
/ o to one of the three stations and put / drops of
each solution into the plastic )ells
3 "a#e sure that you label the )ells identifying each
of the solutions4 ;est each of the solutions )ith red and blue litmus
paper to determine if the solution is an acid base or
neutral. Use the forceps to dip the litmus paper.
After you dip it place the litmus paper on the paper
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to)el.
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!ata:
Solution "ed
lit#us
Blue
lit#us
Acid
or
Base?
pH using
pH
paper
pH using
$abbage
%uiceWater
Coca-Cola
Ammonia
(diluted
!leach
(diluted
"il#
"aalo$
%inegar
&range
'uice
!a#ing oda
(in )ater
$onclusion:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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Analysis uestions:
/. ill in the follo)ing table by listing )hich substances
)ere acids bases or neutralAC=? !A5 ,5U;ou may have seen commercials on ;% for ,e$ium adrug that is ta#en to reduce the symptoms of acid
reflu$ disease. no)ing that this condition is caused
by too much acid in the stomach
a. ?o you thin# ,e$ium )ould be an acid or a
baseB
b. Ho) )ould you test it to find outB
c. 5$plain ho) you thin# it )or#s to relieve
problems caused by too much acid.