Acids and Bases (and some Equilibrium)

Rice Table

100

What is the equilibrium constant for the following reaction: 

O₂ + N₂ --> 2NO

K = [NO]² / [N₂][O₂]

200

what types of matter are not included in equilibrium constants?

solids and pure liquids

300

A mixture of 5.0 mol H₂(g) and 10.0 mol I₂(g) are placed in a 5.0 L container at 450°C and allowed to come to equilibrium. At equilibrium the concentration of HI(g) is 1.87M. Calculate the value for the equilibrium constant, K, for this reaction under these conditions.

K = 50.5

400

If the Kp for the following reaction is 2.4 x 10^-9 and the initial concentration of CO₂ is 2 atm, what are the partial pressures of the substances at equilibrium? Hint: make necessary assumptions to solve.

P_CO2 = 2atm
P_CO = 6.9x10^-5atm

500

What is the equilibrium concentration of IBr if you start with 0.68 M of I₂ and 0.32 M of Br₂?

K = 1.00 x 10^-5

1.48 x 10^-3 M IBr

A&B Definitions

100

What is the most restrictive definition of acids and bases?

Arrhenius (why?)

200

In a Bronsted Lowry reaction, the acid ____

donates a proton

300

In a Bronsted Lowry reaction, conjugate pairs ____

differ by one proton

400

In the following reaction name the acid, base, conjugate acid, and conjugate base:

NH₃(g) + H₂O(l) ⇌ NH₄⁺(aq) + OH^-(aq)

NH₃ -- base

H₂O -- acid

NH₄⁺ -- conjugate acid

OH^- -- conjugate base

500

The Lewis acid and base definition is based on ____

the movement of electrons

Types of Acid

100

True or false: a weak acid dissociates 100%

false

200

Which of the following is a strong acid:

HF, HNO₂, HNO₃, H₃PO₄, HClO₃

Nitric acid

300

Which of the following cannot be a Bronsted-Lowry base?

OH^-

H₂O

NH₃

NH₄⁺

NH₄⁺

400

Which of the following is the conjugate acid of HPO4^2-?

H₃PO₄

H₂PO₄^-

HPO₄^2-

PO₄^3-

H₂PO₄^-

Why is the answer not PO4^3-?

500

Which of the following is amphoteric?

NH₄⁺

HF

HCl

HCO₃^-

HCO₃^-

Acid Strength

100

In a binary acid, the stronger the polarity of the bond, the _______

easier it is to remove the H

WHY?

200

Do you expect H₂SO₃ or H₂SeO₃ to be the stronger acid? Why?

H₂SO₃ because S is more electronegative than Se

300

Which of the following is the strongest acid?

HBrO₄

HBrO₃

HBrO₂

HBrO

HBrO4

400

Arrange in order of increasing acidity: HClO₄, NaCl, HF, Ca(OH)₂, CN^-

Ca(OH)2 < CN- < NaCl < HF < HClO4

500

Arrange the following in order of increasing acid strength in aqueous solution: HClO₂, HNO₂, and HNO₃.

HNO2 < HClO2 < HNO3

pH

100

How do you determine the pH of a solution?

pH = -log[H3O+] = -log[H+]

Remember:

pOH = -log[OH-]

200

What is the pH of 0.15 M H⁺?

pH: 0.82

300

What is the pOH of 9.78×10⁻² M OH?

pOH: 1.01

400

Is the following solution acidic, basic, or neutral?

[H₃O⁺] = 8.6×10⁻³ M

acidic

500

What is the concentration of H₃O⁺ at pH = 3.77

0.00017 M H⁺