Let's plug in 0.5 for this guy, 0.5 for this guy, and 0.2
for our rate of reaction, the forward direction. So we plug these guys in and we solve for KF and we get 0.002 divided by zero. Five 0.5 times 0.05 gives us 0.08. So that means our KF, our rate constant for this reaction going this way is 0.8. So now we plug this into our reaction and we find the final rate law to be the rate of our four reaction is equal to 0.8 times the concentration of our methyl acetate to the first power. Times the concentration of our hydroxide to the first power.