What combination of keys on this calculator do i use to calculate inv logs? There is no INV or antilog key, help!
SOURCE: how do i use the inv log for calculations on my sharp el-531wh
Hello,
Let y=10^(x) 10 to the power of x
Take the log of both tems of the equality. You get
log(y)=log[10^(x)] where I used square brackets for clarity. But from the general properties of logarithms
log(b^(a)) = a*log(b)
Applied to our expression above
log(10^x)=x*log10
But since we are using log as log in base 10, log_10(10)=1
so
log(y)=x
We thus have two equivalent relations
y=10^x <----> x=log(y) The double arrow stands for equivalence.
If y is the log of x, then x is the antilog of y
Your question: With log_10 standing for logarith in base 10
pH=-log_10(c) c= concentration
Then log_10(c)=-pH the equivalence above translates as
log_10(c)=-pH is equivalent to c=10^(-pH)
The concentartion corresponding to a pH of 7.41 is
c=10^(-7.41)=3.89x10^(-8)
You enter it as follows
10[^]7.41[(-)][ENTER/=]
Hope it helps
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