the pKb for methylamine is 3.36, what is the Kb for methylamine?
pKa+pKb= 14.00
Kb= 10^-pKb = 4.4x10^-4 is the answer
but HOW?? what is punched into the calculator to get 4.4 x 10^-4??
pKb = 3.36
pKb = -log Kb
3.36 = -logKb
-3.36 = log Kb
Punch in 3.36 and hit the change sign button OR punch in -3.36 directly, then hit the 10^x key. That will return 4.36515E-4 which rounds to 4.36E-4.
-3.36(log button or 10^x button)= syntax error ??
the key sequence will depend on the type of calculator that you have. If it is a VPAM or similar (like a Casio FX-83) then the sequence is something like
<shift><10^><-><3><.><3><6><=>
and the display will show
0.0004365
(depending on how the display is set up).
The exact key sequence will depend on the model of calculator you have.
To calculate Kb for methylamine, you will follow the equation: Kb = 10^(-pKb).
Here's how you can punch the values into a calculator to get the answer:
1. Start with the given pKb value of methylamine, which is 3.36.
2. Raise 10 to the power of the negative value of pKb. In this case, it will be 10^(-3.36).
3. Punch in 3.36 on the calculator.
4. Look for the key or function on your calculator that raises a number to a power (often represented by "x^y" or "^" symbol).
5. Press the power of (-3.36) or (-3.36) key on your calculator.
6. The result will be 4.4 x 10^(-4), which can also be written as 0.00044 in decimal form.
Keep in mind, scientific calculators often display numbers in scientific notation to represent very small or large values. The "x 10^" part indicates the exponent to which the number should be multiplied or divided. In this case, Kb for methylamine is 4.4 x 10^(-4).