Chemistry and LogarithmsWatch this thread
1. The pK a of HEPES buffer at room temperature is 7.5. What is the acid dissociation constant K a?
I think it is d) 31.6, but not sure.
2. The radioactivity of an isotope R decays exponentially with time according to R = R0exp(-0.35t) where t is the time in days and R0 is the radioactivity at zero time.
What fraction of the initial radioactivity will remain after 6 days?
Don't even know where to start on this one
2. R/R0 = exp(-0.35t) is the fraction of initial radioactivity at time t. You are given t, so just sub in.