Hey guys! Can you please explain each step to the questions that you answer? I a

Question

Hey guys! Can you please explain each step to the questions that you answer? I am having a little trouble with these questions and having a step by step explanation to the answers and how you got them would REALLY help me out. Also if possible, please write neatly :) I appreciate you guys so much. Thanks for all the hard work you guys put in.

19) Determine the [H30*] in a 0.265 M HCIO solution. The Ka of HCIO is 2.9 x 10-8 20) Find the percent ionization of a 0.337 M HF solution. The Ka for HF is 3.5 × 10-4 21) Determine the Ka of an acid whose 0.294 M solution has a pH of 2.80 22) Which of the following bases is the WEAKEST? The base is followed by its Kb value. A) HOCH2CH2NH2, 3.2 x 10-5 B) NH3, 1.76 x 10-5 C) C5H5N, 1.7 x 10-9 D) (CH3CH2)3N, 5.2 x 10-4 E) Since these are all weak bases, they have the same strength 23) Determine the [OH-] concentration in a 0.169 M Ca(OH)2 solution

Explanation / Answer

19)

HClO + H2O <------> H3O+ + ClO -
0.265 0 0 (initial)
0.265-x x x (at equilibrium)

Ka = [H3O+] [ClO-] / [HClO]
2.9*10^-8 = x*x / (0.265-x)
since Ka is very small, x will be small and it can ignored as compared to 0.265
above expression thus becomes,

2.9*10^-8 = x*x / (0.265)
x = 8.766*10^-5 M

[H3O+] = x = 8.766*10^-5 M

Answer: 8.766*10^-5 M

i am allowed to answer only 1 question at a time

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