babij6016 babij6016
  • 10-05-2018
  • Chemistry
contestada

What is the ph of a buffer that consists of 0.45 m ch3cooh and 0.35 m ch3coona? ka = 1.8 × 10–5?

Respuesta :

Dejanras
Dejanras Dejanras
  • 19-05-2018
Answer is: pH of a buffer is 4.64.

ck(CH₃COOH) = 0.45 M.

cs(CH₃COONa) = 0.35 M.

Ka = 1.8·10⁻⁵.

pKa = -logKa.
pKa = -log(1.8·10⁻⁵) = 4.75.
Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).
pH = 4.75 + log(0.35M/0.45M).
pH = 4.75 - 0.11.
pH = 4.64.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.


Answer Link

Otras preguntas

what is the equation of line in graph 4,0 0,-4
whats the product of 3 2/3 and 14 2/5
F(x)= sqrt x-5 Find f-1
2 sin 2θ − 3 sin θ = 0
Giselle graphs the function f(x) = x2. Robin graphs the function g(x) = –x2. How does Robin’s graph relate to Giselle’s?
One scientific hypothesis about the origin of life holds that a. RNA replaced DNA as the most stable information-storing molecule. b. RNA nucleotides were forme
The gradient of a stream depends on its         A. base level.   B. speed.   C. bank level.   D. stream channel.
If granola cost $2.30 per pound how much does 0.7 cost
If tan(x)=4 then tan(pi+x)=?
Static stretches are part of an effective cool down because they can help a. improve performance b. decrease blood flow c. prevent overload d. increase range o