Can you show the work? especially for questions 1 & 4 What is the pH of a 0.0050

Question

Can you show the work? especially for questions 1 & 4

What is the pH of a 0.0050 M solution of hydrochloric acid? 0.0050 1.2 2.3 4.7 If you measure the pH of a carbonic acid solution to be 5 6, what is the concentration of the H_3O^+ in solution? 5.6 M 3.0 M 0.0030 M 3.0 times 10^-6 M Hydrofluoric acid (HF) is a weak acid with a K_a = 7.1 times 10^-4. What is the pH of a 0.50 M solution of HF? 0.92 1.7 5.3 7.2 Ammonia is a weak base that is a household cleaner and has a K_b = 1.8 times 10^-5. What is the pH of a 3.0 M solution of ammonia (NH_3)? 2.1 5.3 8.9 12

Explanation / Answer

1)

Given,

[HCl] = 0.0050 M

HCl being strong acid dissociates completely into H+ and Cl-

HCl —> H+ + Cl-

[H+] = [HCl] = 0.0050 M

pH = -log [H+]

= -log (0.0050)

= 2.30

Answer: 2.3

I am allowed to answer only 1 question at a time

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