Math Practice
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Logarithms
Logarithms
pH, decibels, pKa — the log skills that show up everywhere on C/P
▶
Quick Reference
Definition
log(10
x
) = x
Product Rule
log(AB) = log A + log B
Quotient Rule
log(A/B) = log A − log B
Power Rule
log(A
n
) = n · log A
Estimation
Bound between powers of 10 | log(5) ≈ 0.7 (the midpoint lands at 0.7, not 0.5)
pH Formula
pH = −log[H
+
]
Decibels
β = 10 log(I/I
0
)
Question 1 of 10
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