pH Calculations with Casio Graphics Calculators in Chemistry
Casio graphics calculators and
Chemistry
Use to solve
pH = -log [H
+
]
[H
+
=] = 10
-pH
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CHEMISTRY
Finding –log of a number
Example calculation
-log 1x10
-7
= 7
Calculator displays 7
Select this from menu
You press
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CHEMISTRY
Finding 10
-pH
( to calculate [H
+
])
Example – find the [H
+
] ions in a solution if the pH is 7
[H
+
]= 10
-pH
or [H
+
] = invlog(-pH)
Calculator will display 1.E -07
Which means 1 x 10
-7
(mol L
-1
)
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CHEMISTRY
Tips
•
Don’t forget to give your answer to the
required number of significant figures as
stated in the question.
•
For the unit standard this will be 3 s.f.
No Brain Too Small
CHEMISTRY
Explore how Casio graphics calculators can be used in chemistry to solve pH calculations. Learn how to calculate pH, find the logarithm of a number, and determine the concentration of H+ ions based on pH levels. Remember to pay attention to significant figures when giving your answer. Enhance your understanding of chemistry with these helpful tips and examples.
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Presentation Transcript
Casio graphics calculators and Chemistry Use to solve pH = -log [H+] [H+=] = 10-pH No Brain Too Small CHEMISTRY
Finding log of a number Select this from menu Example calculation -log 1x10-7 = 7 You press Calculator displays 7 No Brain Too Small CHEMISTRY
Finding 10-pH ( to calculate [H+]) Example find the [H+] ions in a solution if the pH is 7 [H+]= 10-pH or [H+] = invlog(-pH) Calculator will display 1.E -07 Which means 1 x 10-7 (mol L-1) No Brain Too Small CHEMISTRY
Tips Don t forget to give your answer to the required number of significant figures as stated in the question. For the unit standard this will be 3 s.f. No Brain Too Small CHEMISTRY
