Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum ph of 9.2−9.3? ch3coona/ch3cooh (ka = 1.8 x 10^−5) nh3/nh4cl (ka = 5.6 x 10^−10) naocl/hocl (ka = 3.2 x 10^−8) nano2/hno2 (ka = 4.5 x 10^−4) nacl/hcl

NH₃/NH₄Cl

Explanation:

We can calculate the pH of a buffer using the Henderson-Hasselbalch's equation.

If the concentration of the acid is equal to that of the base, the pH will be equal to the pKa of the buffer. The optimum range of work of pH is pKa ± 1.

Let's consider the following buffers and their pKa.

The optimum buffer is NH₃/NH₄Cl.

Hello, User!

to find the volume of a cone you need to use this equation!

were r= radius and h=height

then we substitute the values into the equation!

Therefore your answer is about 47 in!

I hope I helped and I was super exited and honored to answer your question have a very nice day!

but if you dont do pi

you get..

so its B. 15(pie) in ^3

-Philaeagles14