What would the initial ph of a carbonic acid - bicarbonate (ka=4.27 x 10-7) buffer be if the ratio of conjugate base to acid is 0.366 to 1?
a.
1.67
b.
1.81
c.
5.79
d.
5.85
e.
5.93

E. 5.93

Explanation:

#Plato

Use the Henderson-Hasselbalch equation:

pH = pKa + log, where A^- is the concentration of the conjugate base of the weak acid & HA is the concentration of the acid.

                    Quick note: A^- = bicarbonate and HA = carbonic acid.

Plug the known numbers into the equation:  

pH = 4.27 x 10^-7 + log

Remember, the 4.27 x 10^-7 is Ka, to change it to pKa use: -log[Ka] and pKa will be 6.37.

Thus,

pH = 6.37 + log(0.366) = 5.93305321

5.93 is the intial pH

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)