7. An increase in solution pH corresponds to A) an increase in hydronium ion con

Question

7. An increase in solution pH corresponds to A) an increase in hydronium ion concentration. B) a decrease in hydronium ion concentration. C) no change in hydronium ion concentration. D) a decrease in hydroxide ion concentration. 8. If the concentration of H30t in an aqueous solution is 7.6×10-9 M, the concentration of OI A) 7.6 x 10-23 M H-is B) 1.3 × 10+8 M C) 6.4 x 10-5 M D)1.3×10-6 M E) 7.6 × 10-9 M 9, what is the pH ofa solution in which the hydrogen ion concentration is 5.1 × 10-8 M? ) 6.71 B) 1.96 × 10-7 C) 8.90 D) 5.10 E) 7.29 10. What is the [H30+] in a solution with pH 11.61? A) 1.16 × 10+1 M B) 2.39 10+1 M C) 4.07 x 10-3 M D) 1.00 × 10-14 M E) 2.45 x 10-12 M

Explanation / Answer

7)

pH = -log [H3O+]

So,

increasing pH means decreasing H3O+.

this is because of negative sign

Answer: B

8)

we have below equation to be used:

[OH-] = Kw/[H3O+]

Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC

[OH-] = (1.0*10^-14)/[H3O+]

[OH-] = (1.0*10^-14)/(7.6*10^-9)

[OH-] = 1.3*10^-6 M

Answer: B

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