i need the solution CHEM 30A FINAL EXAM NAME 5) What is the (OH-] in a solution

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i need the solution

CHEM 30A FINAL EXAM NAME 5) What is the (OH-] in a solution that has a [ H30+]-1x 10-6 M? A) 1 x 10-2 M B) 1 x 10-6 M C)1 x 10-8 M D) 1 × 10-10 M E) 1 x 10-12 M Answer: C 6) For the following reaction, the eq concentration of N204 is 1.0M. What is the value of the equilibrium constant? uilibrium concentration of NO2 is 0.38 M and equilibrium 2NO28)N204(g) A) 0.14 B) 2.6 C) 6.9 D) 0.38 E) 1.0 Answer: C 7) For the following equilibrium reaction, which cause and effect are correctly mat Cog)+ 2H2(8) CH3OH(g) + heat A) add heat, shift right B) add CO, shift left C) remove CH3OH, shift left D) remove heat, no change E) remove H2, shift left Answer:E 8) What is the molarity of a solution that contains 3.25 moles of NaNO3 in 250. mL of solution? A) 3.25 M B) 6.50 M C) 0.0130 M D) 13.0 M E) 2.60 M Answer: D

Explanation / Answer

5)

The relation between [H3O+] and [OH-] is,

[H3O+] x [OH-] = Kw

Kw is autoionization constant for water and its value is 1.0x10-4 .

The value concentration of H3O+ , [H3O+] given is 1x10-6 M.

So,

[OH-] = Kw /[H3O+] = (1.0x10-14 )/(1x10-6 ) = 1x10-8 M.

So, the correct option is C.

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