Assignment # Acidic, Basic, and Neutral Solutions Biology Mrs. McCarthy Wednesday, November 18,...
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Transcript of Assignment # Acidic, Basic, and Neutral Solutions Biology Mrs. McCarthy Wednesday, November 18,...
![Page 1: Assignment # Acidic, Basic, and Neutral Solutions Biology Mrs. McCarthy Wednesday, November 18, 2015.](https://reader036.fdocuments.us/reader036/viewer/2022083006/56649f2b5503460f94c46ab9/html5/thumbnails/1.jpg)
Assignment #Acidic, Basic, and Neutral Solutions
Biology
Mrs. McCarthy
Thursday, April 20, 2023
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I. Acidic, Basic, and Neutral Solutions
A. Solutions are acidic, basic, or neutral depending on the concentration of hydrogen ions (H+) in the solution.
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1. Acidic solutions contain more hydrogen ions (H+)Release hydrogen as they dissolve
HCl
H+ Cl-
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Examples: grapefruit juice, vinegar, coffee, digestive juices
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2. Basic solutions contain more hydroxide ions (OH-)Release hydroxide ions as they dissolve
NaOH
Na+ OH-
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Examples: baking soda, soap, egg whites, bleach
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2. Neutral solutions Have an equal amount of hydrogen and
hydroxide ions
H2O
H+ OH-
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Examples: pure, distilled water
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I. Acidic, Basic, and Neutral Solutions
B. pH scalep = potentialH = hydrogen ionsStandard scale of hydrogen ions present
in a solutionThere is a 10x difference between each
number in the pH scale
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ExamplepH 2 is 10x stronger than pH 3
pH 3 is 10x stronger than pH 4
Therefore:
pH 2 is 100x stronger than pH 4
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How many times more acidic is pH 5 than pH 8?
How many times more basic is pH 11 than pH 7?
1,000 times
10,000 times
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Scientific notation can be used to show the difference between numbers on the pH scale. Scientific notation is a way to make these numbers easier to work with. In scientific notation, you move the decimal place until you have a number between 1 and 10. Then you add a power of ten that tells how many places you moved the decimal.
Here are some examples of
scientific notation and the
numbers it represents:
Abbreviation Number 1.0 x 10-5 .000012.5 x 10-3 .00251.0 x 102 1003.4 x 102 3401.0 x 105 100,000105 100,0006.0 x 106 6,000,000
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Use scientific notation to show how many times more acidic pH 2 is than pH 12:
2 is 10 places away from 12 on the scale
10 10 = 10000000000
OR
1 x 10 10 times more acidic
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Practice:
1. Write 123,000,000,000 in scientific notation.
2. Write 0.00000034 in scientific notation.