Alanine, h2nch(ch3)co2h, has ka = 4.5  10–3 and kb = 7.4  10–5 . which species has the highest concentration at a ph of 7.00 in h2o?

Question

25-02-2018
Chemistry

contestada

Alanine, h2nch(ch3)co2h, has ka = 4.5  10–3 and kb = 7.4  10–5 . which species has the highest concentration at a ph of 7.00 in h2o?

Respuesta :

Otras preguntas

Which ordered pairs in the form (x, y) are solutions to the equation (x + 6)y = 9? Choose all answers that are correct. A. (−5, 9) B. (−3, 3) C. (3, 1) D.

how many moles are represented by 250g of platinum?

Why did bacons rebellion collapse

A contractor digs a hole for the basements of a new house that is 40 feet long and 10 1/2 feet deep. What is the width of the hole if 6,510 cubic feet of dirt a

(c-30)(c-120)=184 how do I solve it

Solve the following equations enter x-coordinate of the solution round to the nearest tenth 5y+2y=22 -2y+6y=3

A box has sides with these measures: length 10 cm, width 8 cm, height h cm. If the volume is 400 cm3 , find the measure of the height. You may use the equation

Dejanras Dejanras · Answer 1 · 2018-03-06T10:52:52+01:00

Dejanras Dejanras

06-03-2018

Answer is: the highest concentration has ⁺H₃NCH(CH₃)CO₂⁻.
pKa(carboxylic group) = -log(4,5·10⁻³) = 2,35.
pKb(amino group) = -log(7,4·10⁻⁵) = 4,13.
pKa + pKb = 14.
pKa(amino group) = 14 - 4,13 = 9,87.
At pH = 7 carboxylic group lost proton(H⁺) and became COO⁻, amine is protoneted (NH₃⁺) in this pH value.

Answer Link