Question

1)

Which of the following best indicates the meaning of the term autoionization?

Select the correct answer below:

a)Autoionization is a reaction involving the transfer of a proton from an acid to water, yielding hydronium ions and the conjugate base of the acid.

b)Autoionization is a reaction involving the transfer of a proton from water to a base, yielding hydroxide ions and the conjugate acid of the base.

c)Autoionization is a reaction between two molecules of the same neutral substance to produce an ion pair.

d)Autoionization is the process by which water dissociates into hydroxide ions and protons.

2)

What is the hydroxide concentration in a solution at 25.0∘C with [H3O+]=5.9×10−13 M?

• Report your answer with two significant figures.

3)

Which of the following solutions has a greater concentration of hydroxide ions? Solution A has a pOH of 6.1. Solution B has a pOH of 12.5.

Select the correct answer below:

a)Solution A

b)Solution B

c)The concentrations are the same.

d)There is not enough information.

4)

What is the pH of a solution with [H3O+]=2.6×10−5 M?

Report your answer to the hundredths place.

5)

Answer 1

Q 1 ) in auto ionisation two same molecule react with each other and transfer proton between them , one act as an acid and other act as a base correct answer is ( c )

Q2 ) [ H⁺ ] [ OH^— ] = 10^–14 at 25 ^o C

[ OH^— ] = 10^–14 / 5.9 x 10^-13 = 0.017 M

Q3 ) for solution A

[ OH^— ] = 10^–6.1 M

for solution B

[ OH^- ] = 10^–12.5 M

so solution A has greater concentration of hydroxide ion.

Q4) [ H₃O⁺ ] = 2.6 x 10^-5 M

P^H = — log [ H₃O⁺] = — log ( 2.6 x 10^–5 ) = 4.585