My professor told us if the ratio of concentration over Ka is greater than 100, then we can neglect the x on the denominator. But when i apply the rule in this video(0.02/7.5x10^-3) the result is smaller than 100. How do we decide that we can neglect the x ?
Great video! I've always found it faster to just set up a quadratic and solve for x and then you get an exact solution.
My professor told us if the ratio of concentration over Ka is greater than 100, then we can neglect the x on the denominator. But when i apply the rule in this video(0.02/7.5x10^-3) the result is smaller than 100. How do we decide that we can neglect the x ?