An aqueous solution contains dissolved c6h5nh3cl and c6h5nh2. the concentration of c6h5nh2 is 0.53 m and ph is 4.17. (a) calculate the concentration of c6h5nh3+ in this buffer solution.

pOH = 14 - 4.22 =9.78  

Kb of aniline = 4.0 x 10^-10  

pKb = 9.40  

9.78 = 9.40 + log [C6H5NH3+] / 0.37  

10^0.38= 2.40 = [C6H5NH3+]/ 0.37  

[C6H5NH3+]= 0.89 M  

moles aniline = 0.37 M x 1 L = 0.37  

moles anilinium = 0.89 x 1 L = 0.89  

moles NaOH = 4.6 g / 40 g/mol=0.12  

C6H5NH3+ + OH- >> C6H5NH2 + H2O  

moles anilinium = 0.89 - 0.12 =0.77  

moles aniline = 0.37 + 0.12 = 0.49  

pOH = 9.40 + log 0.77/ 0.49=9.60  

pH = 4.40

Explanation:

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

i would say b

explanation:

but i think i would need more information than that