Acid Base Reaction Species

Bio Sciences: pH

04/19/23 1

BellworkBellwork

Bromothymol blue turns ______ in an acid and ______in a base.

04/19/23 Property of CTE Joint Venture 2

Yellow

Blue

ObjectivesObjectives1. Write the generic format for an acid base reaction2. Identify the salt on the product side of an acid base reaction3. Write the definition of a conjugate acid or base4. Pick out the conjugate base and conjugate acid from and acid base reaction5. Match the acid/base and conjugated base/ acid pair when given an acid base reaction 04/19/23 Property of CTE Joint Venture 3

TerminologyTerminologySalt: In chemistry, salts are compounds that result from the neutralization reaction of an acid and a base. They are composed of what is left of the acid after it losses a proton (H+) and what is left of the base after is loses/ produces the hydroxide (OH-).

Conjugate Acid-Base Pair: Conjugate acid-base pairs are compounds that differ by the presence of one proton, or H+.

Conjugate Acid: What results when a base accepts a proton (H+), it becomes a conjugate acid because it now has a proton that it can donate

Conjugate Base: What results when an acid donates a proton (H+) it becomes a base, because it now has room to accept a proton.

04/19/23 Property of CTE Joint Venture 4

Acid Base Equation

HA + BOH ↔ BA + H2O

04/19/23 Property of CTE Joint Venture 5

The Acid Base Salt Water

The above is a generic example of and acid base neutralization reaction, which produces a salt and water.

What is a neutralization reaction?

We will learn what a salt is in a bit

Acid Base Recall

What is the acid in the reaction? What is the base? Use your notes/ vocab sheets from earlier in the unit if you need assistance, and write in lab book.

04/19/23 Property of CTE Joint Venture 6

1. HCl + NaOH ↔ NaCl + H2OAcid Base

2. KOH + HC2H3O2 ↔ KC2H3O2 + H2OAcidBase

Salts

With out going into a lot of detail, one of the products from a neutralization reaction is a salt – and no, it is not always NaCl. There are various types of acid base reactions, but we will just focus on those that always produce water and a salt

04/19/23 Property of CTE Joint Venture 7

HA + BOH ↔ BA + H2O

Salt

Salts

The definition of a salt in chemistry is: Compounds that result from the neutralization reaction of an acid and a base.Salts are composed of what is left of the acid after it losses a proton (H+) and what is left of the base after is loses/ produces the hydroxide (OH-).

04/19/23 Property of CTE Joint Venture 8

HA + BOH ↔ BA + H2O

Salt

Acid Base Reactions Salt

Right each reaction down and circle the salts.HClO + NaOH NaClO + H2O

H2SO4 + KOH KHSO4 + H2O

LiH5C8O7 + H2O H6C8O7 + LiOH *

04/19/23Property of CTE Joint Venture 9

*hydrolysis reaction, but still look for salt

Conjugate Acids and BasesConjugate Acid: What results when a base accepts a proton (H+), it becomes a conjugate acid because it now has a proton that it can donate

Conjugate Base: What results when an acid donates a proton (H+) it becomes a base, because it now has room to accept a proton.

04/19/23 Property of CTE Joint Venture 10

B + HA ↔ BH+ + H-

Base Conjugate Acid

B + HA ↔ BH+ + H-

Acid Conjugate Base

Conjugate Acids and Bases A-B Partner Teach

Turn to a partner and tell them the two (2) most important things they have learned so far in regards to conjugate acids and bases, Specifically partner A: how to find the conjugate acid if given the base. Partner B: how to find the conjugate base if given the acid.

04/19/23 Property of CTE Joint Venture 11

Writing Conjugate Acids and Bases

Using your definition of a Bronsted Lowry Acid and Base and your definition of a conjugate acid or base fill in the correct solution to the blanks HCl + NH3 ____+ Cl-

HC2H3O2 + H2O ____ + H3O+

H2O + NH3 NH4 + + ____04/19/23 Property of CTE Joint Venture 12

NH4 +

C2H3O2-

OH-

Conjugate Acids and Base PairsRecalling your definitions of Bronsted Lowry acids and bases, together they therefore exist as conjugate pairs whose formulas are related by the gain or loss of a hydrogen ion.Conjugate Acid-Base Pair: Conjugate acid-base pairs are compounds that differ by the presence of one proton, or H+.

04/19/23 Property of CTE Joint Venture 13

Conjugate Acids and Base Pairs Practice

Using your Knowledge of conjugate acids and bases identify the conjugate acid base pairs in the following reactions ?

HCl + NH3 NH4 + + Cl-

HC2H3O2 + H2O C2H3O2- + H3O+

04/19/23 Property of CTE Joint Venture 14

Conjugate Acids and Base Pair

Conjugate Acids and Base Pair

Conjugate Acids and Base Pair

Conjugate Acids and Base Pair

ClosureClosure

Respond to ALL of the following prompts using at least one to relate to Conjugate Acids, Conjugate Bases, and Salts:         a. I now understand.....       b. I would like to know more about....       c. I need more help with....       d. I could teach someone else to....

04/19/23 Property of CTE Joint Venture 15