Question

Question 10

A solution of a compound in water conducts electricity, turns litmus red, and has a sour taste. What compound might be in the solution?

Select the correct answer below:

NaHCO3

Mg(OH)2

C3H5(COOH)3

NH3

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Question 11

When ranking the strength of acids in aqueous solution, water is acting as:

a base.

an acid.

both an acid and a base.

neither an acid nor a base.

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Question 12

Use the periodic table below to answer the question that follows.

Which is a possible example of species that can comprise a buffer solution?

Select the correct answer below:

HClO4 and ClO−4

H2SO4 and H2O

H2PO−4 and H3PO4

CH3OH and CH3COOH

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Question 13

Which of the following is the term for the reaction between two molecules of the same neutral substance to produce an ion pair?

Select the correct answer below:

autoionization

stepwise ionization

bimolecular reaction

recursive reaction

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Question 14

An aqueous solution at 25∘C has a hydronium ion concentration of 9.7×10−5 M. What is the hydroxide ion concentration of the solution?

Select the correct answer below:

9.7×10−19 M

9.7×10−12 M

1.0×10−10 M

1.0×10−3 M

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Answer 1

10) Litmus turns red means compound is base. Base have the sour taste. It's solution conduct the electricity so it completely dissolved in water ( electrolyte).

Hence correct option is Mg(OH)₂

11) water donate proton as well as accept the proton. So it acts as an acid and base. Hence it is amphiprotic.

Therefore correct option is both an acid and base.

12) Buffer solution is formed by weak acid and its conjugate base.

Hence correct option is H₂PO₄^- and H₃PO₄

13)

The reaction between two molecules of same neutral substance to produce ion pair is called Autoionization

14) [H3O+] [OH-] = Kw

Here Kw is ionic product of Water ( 1.0×10^-14)

[OH-] = Kw / [H3O+]

[OH-] = (1×10^-14)/(9.7×10^-5)

[OH-] = 1.03×10^-10

Hence correct option is 1.0×10^-10 M