12. Consider the following mono-protic acids. lactic acid: HC 3 H 5 O 3 ( K a =

Question

12. Consider the following mono-protic acids.

lactic acid: HC3H5O3 (Ka = 1.4 × 10-4)

water H2O (Ka = 1.8 × 10-16)

hypochlorous acid: HOCl (Ka = 3.5 × 10-8)

hydrocyanic acid: HCN (Ka = 4.9 × 10-10)

nitrous acid: HNO2 (Ka = 1.0 × 10-10)

Which of the following solutions will have the lowest pH?

(Hint: You should not have to do any calculations.)

A) 0.5 M NaC3H5O3              

B) H2O           

C) 0.5 M NaOCl        

D) 0.5 M NaCN         

E) 0.5 M NaNO2

8. The concentration of HNO3 in water is gradually increased without changing the volume significantly. Which of the following describes what happens to the concentrations of H3O and OH, the pH and the poH? concentration of H3O concentration of OH poH pH (a) decreases increases increases increases (b) decreases decreases increases increases (c) decreases decreases increases increases (d) decreases decreases increases decreases (e) decreases increases increases decreases

Explanation / Answer

8. Answer:- e

HNO3 is a strong acid and dissociate in water to produce H3O+ ions.

On increasing HNO3 concentration

A) H3O+ concentration increase

B) OH- concentration decrease

C) as pH is negative logarithm of H3O+ so pH decrease

D) pOH increase as pH decrease

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