Goals to Accomplish Today 5.18.12
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Transcript of Goals to Accomplish Today 5.18.12
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Goals to Accomplish Today 5.18.12
1.Go over pg. 74-75 and concept review
2.Lecture: Indicators and pH
(A) pg. 76-77
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Universal Indicator
Base
s
Acid
s
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Phenolpthalein IndicatorIdentifies if a base is present: turns
pink
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Litmus Paper- tells you if you have an acid or a base
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What is the pH scale and what am I really measuring? A value to express the acidity of a solution
(power of hydrogen)
Ranges from 0-14 0-6 Acidic 7 Neutral8-14 Basic
Measures the hydronium ions in a solutionThe more hydronium ion the more acidic
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pH paper
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pH scale : measures acidity/basicity
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pH scale
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
ACID BASE
NEUTRAL
Each step on pH scale represents a factor of 10.
pH 5 vs. pH 6 (10X more acidic)pH 3 vs. pH 5 (100X different)
pH 8 vs. pH 13 (100,000X different)
: measures acidity/basicity
10x10x10x
Soren Sorensen(1868 - 1939)
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pH scale`
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pH of Common Substances
Timberlake, Chemistry 7th Edition, page 335
1.0 MHCl0
gastricjuice1.6
vinegar2.8
carbonated beverage3.0
orange3.5
apple juice3.8
tomato4.2
lemonjuice2.2 coffee
5.0
bread5.5
soil5.5
potato5.8
urine6.0
milk6.4
water (pure)7.0
drinking water7.2
blood7.4
detergents8.0 - 9.0
bile8.0
seawater8.5
milk of magnesia10.5
ammonia11.0
bleach12.0
1.0 MNaOH(lye)14.0
8 9 10 11 12 14133 4 5 621 70
acidic neutral basic[H+] = [OH-]
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Calculating the pH Since pH is dependent on the
concentration of hydronium ions the formula for calculating pH is the following:
pH = -log[H3O+]
Example: Calculate pH if [H3O+] = 5.00 x 10-3M
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Calculating Concentration of the Acids or Base from pH
[H3O+] = 10 –pH
EXAMPLE: pickle juice has a pH of 3.2 What is the hydronium ion concentration?
[H3O+] = 10 –3.2
[H3O+] = 6.3 x 10 -4 M